Structured Query Language is a standard Database language that is used to create, maintain, and retrieve the relational database. In this article, we will discuss this in detail about SQL. Following are some interesting facts about SQL. Let’s focus on that. SQL is case insensitive.Cypher is a declarative graph query language that allows for expressive and efficient data querying in a property graph.. Cypher was largely an invention of Andrés Taylor while working for Neo4j, Inc. (formerly Neo Technology) in 2011. Cypher was originally intended to be used with the graph database Neo4j, but was opened up through the openCypher … A query language is a specialized programming language for searching and changing the contents of a database. Even though the term originally refers to a sublanguage for only searching (querying) the contents of a database, modern query languages such as SQL are general languages for interacting with the DBMS, including statements for defining and changing the database schema, populating the ... Jul 10, 2017 · Syntax of M. Syntax of this language is simple. it always has two blocks of programming: LET expression block, and IN expression block. Here is the most simple M syntax; let. x=1. in. x. let and in are reserved words. before going even one step further, the first and foremost thing you need to know; Mar 23, 2023 · Kusto Query Language (KQL) is a powerful query language to analyse large volumes of structured, semi structured and unstructured (Free Text) data. It has inbuilt operators and functions that lets you analyse data to find trends, patterns, anomalies, create forecasting, and machine learning. Along with Azure Synapse Data Explorer, other Azure ... Structured Query Language (SQL) is a query language used with relational databases such as MySQL, Oracle, MSSQL, PostgreSQL, and many others. It is a query language that you can use to create and delete databases and tables, insert and read data into tables, delete data from tables, and much more. For example, let's say that you have … SQL (pronounced interchangeably as “sequel” and “S-Q-L” in the industry) is a query language that allows coders to find, change or otherwise manipulate information in relational databases. SQL’s utility and easy to learn syntax have long cemented it as a standard language for back end developers and data scientists. Episode Notes. On this week’s episode, the panel is first joined by Slate’s music critic, Carl Wilson, to puzzle over The Tortured Poets Department, Taylor Swift’s …Large language models have demonstrated outstanding performance on a wide range of tasks such as question answering and code generation. On a high level, given an input, a language model can be used to automatically complete …CQL and ECQL ¶. CQL and ECQL. ¶. CQL (Common Query Language) is a query language created by the OGC for the Catalogue Web Services specification . Unlike the XML-based Filter Encoding language, CQL is written using a familiar text-based syntax. It is thus more readable and better-suited for manual authoring. However, CQL has …However, writing a query requires a set of pre-defined code to make the database understand the instruction. This concept is also known as the query language. While the standard language for database management is Structured Query Language (SQL), other query languages to make database communication easy include AQL, …Mar 23, 2023 · Kusto Query Language (KQL) is a powerful query language to analyse large volumes of structured, semi structured and unstructured (Free Text) data. It has inbuilt operators and functions that lets you analyse data to find trends, patterns, anomalies, create forecasting, and machine learning. Along with Azure Synapse Data Explorer, other Azure ... This section details the query language keywords available in the schematic, PCB, and library documents in Altium Designer. For help on a specific query keyword, use the following collapsible sections or highlight (or click inside) any given keyword - in the Query Helper , a Filter panel, or the Query field of a PCB design rule - and press F1 to …Welcome to SQL. SQL, or Structured Query Language, is a language specifically designed for accessing and interacting with databases. It allows users to create tables, modify data, and retrieve information in a fast and efficient manner. SQL is one of the most popular query languages in use today.The idea of a standalone graph query language to complement SQL was raised by ISO SC32/ WG3 members in early 2017, and is echoed in the GQL manifesto of May 2018. GQL supporters aim to develop a rock-solid next-generation declarative graph query language that builds on the foundations of SQL and integrates proven ideas from …Oct 13, 2023 · The query language provides the ability to send data manipulation and formatting requests to the data source, and ensure that the returned data structure and contents match the expected structure. The syntax of the query language is similar to SQL. Developers familiar with SQL should be able to quickly learn and use this query language. LogQL is Grafana Loki’s PromQL-inspired query language. Queries act as if they are a distributed grep to aggregate log sources. LogQL uses labels and operators for filtering. There are two types of LogQL queries: Log queries return the contents of log lines. Metric queries extend log queries to calculate values based on query results.Các kiểu dữ liệu trong ngôn ngữ SQL, một trong những ngôn ngữ truy vấn phổ biến nhất với các lập trình viên. Ngôn ngữ truy vấn (tiếng Anh: Query language) là tên gọi chung để chỉ các ngôn ngữ máy tính được dùng để tạo các truy vấn trong các cơ sở dữ liệu và các hệ thống thông tin.Step 2 — Querying Individual Fields. At the end of the previous step, you used MongoDB’s find() method to return every document from the peaks collection. A query like this won’t be very useful in practice, though, as it doesn’t filter any documents and always returns the same result set.SQL (Structured Query Language) is a standard language used to store, retrieve, and manipulate data in relational databases. It allows end-users to communicate with databases and perform tasks like creating, updating, and deleting databases. Almost every mid to large-sized organization uses SQL, including Facebook, Microsoft, LinkedIn, and ... PDF RSS. With CloudWatch Logs Insights, you use a query language to query your log groups. The query syntax supports different functions and operations that include but aren't limited to general functions, arithmetic and comparison operations, and regular expressions. To create queries that contain multiple commands, separate the commands with ... A query language is a specialized programming language for searching and changing the contents of a database. Even though the term originally refers to a sublanguage for only searching (querying) the contents of a database, modern query languages such as SQL are general languages for interacting with the DBMS, including statements for defining and changing the database schema, populating the ... Graph semantics in Kusto Query Language (KQL) allows you to model and query data as graphs. The structure of a graph comprises nodes and edges that connect them. Both nodes and edges can have properties that describe them. Graphs are useful for representing complex and dynamic data that involve many-to-many, hierarchical, or networked ...Definition 3.1. (LLM-enhanced Query Rewrite): Given a large language model , a textual instruction outlining the rewrite task , a set of candidate rules , one successful rewrite …Kusto Query Language (KQL) is used to write queries in Azure Data Explorer, Azure Monitor Log Analytics, Azure Sentinel, and more. This tutorial is an introduction to the essential KQL operators used to access and analyze your data. For more specific guidance on how to query logs in Azure Monitor, see Get started with log queries. Cypher (query language) Cypher is a declarative graph query language that allows for expressive and efficient data querying in a property graph. [1] Cypher was largely an invention of Andrés Taylor while working for Neo4j, Inc. (formerly Neo Technology) in 2011. [2] Cypher was originally intended to be used with the graph database Neo4j, but ... ภาษาสอบถาม (อังกฤษ: query language, data query language หรือ database query language; DQL) เป็นภาษา ...Bazel query language concepts. The Bazel query language is a language of expressions. Every expression evaluates to a partially-ordered set of targets, or equivalently, a graph (DAG) of targets. This is the only datatype. Set and graph refer to the same datatype, but emphasize different aspects of it, for example:There are 3 modules in this course. The "Splunk Query Language and Data Analysis" course equips you with fundamental skills to effectively use Splunk, a powerful platform for managing machine-generated data. Whether you're an experienced IT professional or new to data analysis, this course provides a foundational understanding of Splunk's query ...Aug 21, 2018 · SQL (Structured Query Language) is a declarative query language and is the industry standard for relational databases. In the graph technology ecosystem, several query languages are considered declarative: Cypher, SPARQL and Gremlin (which also includes some imperative features, as mentioned above). Using a declarative database query language ... Các kiểu dữ liệu trong ngôn ngữ SQL, một trong những ngôn ngữ truy vấn phổ biến nhất với các lập trình viên. Ngôn ngữ truy vấn (tiếng Anh: Query language) là tên gọi chung để chỉ các ngôn ngữ máy tính được dùng để tạo các truy vấn trong các cơ sở dữ liệu và các hệ thống thông tin.Applies to: Microsoft Defender XDR. Advanced hunting is based on the Kusto query language. You can use Kusto operators and statements to construct queries that locate information in a specialized schema. Watch this short video to learn some handy Kusto query language basics. To understand these concepts better, run your first query.This allowed you to expand or limit results based on some simple operators like AND, OR, or NOT. That Boolean Query example is one of the basic concepts behind something called Keyword Query Language, also known as KQL . If you would like to build more advanced searches and queries in SharePoint – you need to understand what it is …There are 4 modules in this course. In this course, you'll walk through installation steps for installing a text editor, installing MAMP or XAMPP (or equivalent) and creating a MySql Database. You'll learn about single table queries and the basic syntax of the SQL language, as well as database design with multiple tables, foreign keys, and the ... SQL (pronounced interchangeably as “sequel” and “S-Q-L” in the industry) is a query language that allows coders to find, change or otherwise manipulate information in relational databases. SQL’s utility and easy to learn syntax have long cemented it as a standard language for back end developers and data scientists. The ArangoDB Query Language (AQL) is similar to the Structured Query Language (SQL) in its purpose. Both support reading and modifying collection data, however AQL does not support data definition operations, such as creating and dropping databases, collections and indexes. Though some of the keywords overlap, AQL syntax differs from SQL.In order of importance: Only reference tables whose data is needed by the query. For example, when using the union operator with wildcard table references, it is better from a performance point-of-view to only reference a handful of tables, instead of using a wildcard (*) to reference all tables and then filter data out using a predicate on …GraphQL is similar - technically any query could be implemented to cause a data write. However, it’s useful to establish a convention that any operations that cause writes should be sent explicitly via a mutation. Just like in queries, if the mutation field returns an object type, you can ask for nested fields.Query language is a fundamental aspect of database management and artificial intelligence (AI). It refers to a specialized language used to communicate with …Note. If you're collecting data from at least one virtual machine, you can work through this exercise in your own environment. For other scenarios, use our demo environment, which includes plenty of sample data.. If you already know how to query in Kusto Query Language (KQL) but need to quickly create useful queries based on … You can use Vault Query Language (VQL) to access, retrieve, and interact with Vault data. This guide provides details on how to best utilize VQL, outlining its syntax, structure, clauses, and operators. Although VQL queries share most of the same syntax as Structured Query Language (SQL), VQL statements allow you to perform queries specifically ... GraphQL is similar - technically any query could be implemented to cause a data write. However, it’s useful to establish a convention that any operations that cause writes should be sent explicitly via a mutation. Just like in queries, if the mutation field returns an object type, you can ask for nested fields.In standard English, a query means a request for information. In computer programming, it refers to the same thing, except the information is retrieved from a database. However, writing a query requires a set of pre-defined code to make the database understand the instruction. This concept is also known as the query language. A query language for your API. GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools. Kusto Query Language (KQL) is a powerful query language to analyse large volumes of structured, semi structured and unstructured (Free Text) data. It has inbuilt operators and functions that lets you analyse data to find trends, patterns, anomalies, create forecasting, and machine learning. Along with Azure Synapse Data Explorer, other Azure ...There are 3 modules in this course. The "Splunk Query Language and Data Analysis" course equips you with fundamental skills to effectively use Splunk, a powerful platform for managing machine-generated data. Whether you're an experienced IT professional or new to data analysis, this course provides a foundational understanding of Splunk's query ...The query language provides the ability to send data manipulation and formatting requests to the data source, and ensure that the returned data structure and …Query language is a fundamental aspect of database management and artificial intelligence (AI). It refers to a specialized language used to communicate with …Query by Example (QBE) QBE is a high-level, visual query language that allows users to form queries using examples rather than strict syntax. Its graphical nature makes it user-friendly, particularly for non-technical users. XQuery. XQuery is a functional language specifically designed to query XML data.5 Mins Read. Embedded SQL is a powerful technique that combines SQL (Structured Query Language) statements within a high-level programming language. This integration allows developers to seamlessly incorporate database queries and operations into their application code. In this comprehensive guide, we will explore the concept of …SQL to Kusto cheat sheet. Related content. If you're familiar with SQL and want to learn KQL, translate SQL queries into KQL by prefacing the SQL query with a comment line, --, and the keyword explain. The output shows the KQL version of the query, which can help you understand the KQL syntax and concepts. Run the query.SQL and KQL are both query languages used in data analysis, but they differ in their application in cybersecurity. SQL has broader use cases beyond cybersecurity, while KQL is primarily used for security-related queries. Data science plays a crucial role in modern cybersecurity, with KQL being increasingly used for this purpose. A query language is a specialized programming language for searching and changing the contents of a database. Essentially, a query language is a computer programing language that is used for the purpose of retrieving information or data from a database. Even though the term originally refers to a sublanguage for only searching (querying) the ... SQL (Structured Query Language) allows programmers to query, update and reorganize data while modifying database schema to control data accessibility.Abstract. Query language identification (Q-LID) plays a crucial role in a cross-lingual search engine. There exist two main challenges in Q-LID: (1) insufficient contextual information in queries for disambiguation; and (2) the lack of query-style training examples for low-resource languages. In this article, we propose a neural Q-LID model …In Compass, use the left navigation panel to select the database and the collection you want to import the data to. Click the Documents tab. Click Add Data and select Insert Document. Set the View to JSON ( {} ). Paste the JSON documents from …Returns the time offset relative to the time the query executes. For example, ago(1h) is one hour before the current clock's reading. ago(a_timespan) format_datetime. Returns data in various date formats. format_datetime(datetime , format) bin. Rounds all values in a timeframe and groups them.There are 4 modules in this course. In this course, you'll walk through installation steps for installing a text editor, installing MAMP or XAMPP (or equivalent) and creating a MySql Database. You'll learn about single table queries and the basic syntax of the SQL language, as well as database design with multiple tables, foreign keys, and the ...The first database query language to be certified by ISO since SQL in 1987, the new standard was developed by a group of database vendors, academics, and tech …Dec 12, 2022 · Prompting Is Programming: A Query Language for Large Language Models. Luca Beurer-Kellner, Marc Fischer, Martin Vechev. Large language models have demonstrated outstanding performance on a wide range of tasks such as question answering and code generation. On a high level, given an input, a language model can be used to automatically complete ... The de facto standard for query languages is SQL. Webopedia Staff . Since 1995, more than 100 tech experts and researchers have kept Webopedia’s definitions, articles, and study guides up to date. For more information on current editorial staff, please visit our About page. Related Articles. VPN (Virtual Private Network)JMESPath is a query language which has library implementations in many programming languages (JavaScript, Python, Java, Go, Rust, .Net, and others). There is a command line application, jp, available to use JMESPath on the command line. And JMESPath can be used as a query language in the visual web application JSON Editor …Structured Query Language — commonly known as SQL — is a language that is used to define, control, manipulate, and query data held in a relational database. SQL has been widely adopted since it was first developed in the early 1970s, and today it’s the predominant language used to interact with relational database management systems.It's a language that transcends industries and job roles, making it an essential skill in today's data-driven world. The history of SQL is a fascinating journey that began in the 1970s. If you're interested in learning more, read The History of SQL – How It All Began. SQL is not just a relic of the past, though.SQL is the programming language used to talk to databases. A SQL query is an expression, similar to an English sentence, that defines the set of data to be retrieved from the database. You can think of a SQL query as a question you sent to the database; after that, you expect the database will respond to the question by sending back the data.Query languages for semi-structured data were introduced almost as early as the data model itself. Lorel [] was one of the first query language for semi-structured data, and it introduced the concept of regular path expressions for navigating paths with partially known structure.The language UnQL [] emphasized transformations over queries, and …Querying with WQL. The WMI Query Language (WQL) is a subset of standard American National Standards Institute Structured Query Language (ANSI SQL) with minor semantic changes to support WMI. For a complete list of supported WQL keywords, see WQL (SQL for WMI). Using SQL keywords for object or property names … Cypher (query language) Cypher is a declarative graph query language that allows for expressive and efficient data querying in a property graph. [1] Cypher was largely an invention of Andrés Taylor while working for Neo4j, Inc. (formerly Neo Technology) in 2011. [2] Cypher was originally intended to be used with the graph database Neo4j, but ... WIDA is committed to providing assessments that best measure academic English language proficiency. WIDA recognizes that all students must be assessed in a valid …The de facto standard for query languages is SQL. Webopedia Staff . Since 1995, more than 100 tech experts and researchers have kept Webopedia’s definitions, articles, and study guides up to date. For more information on current editorial staff, please visit our About page. Related Articles. VPN (Virtual Private Network)Welcome to SQL. SQL, or Structured Query Language, is a language specifically designed for accessing and interacting with databases. It allows users to create tables, modify data, and retrieve information in a fast and efficient manner. SQL is one of the most popular query languages in use today.Learn HQL (hibernate query language) basics, HQL syntax for various CRUD statements, named and native SQL queries, associations and aggregations etc. with the help of examples. 1. What is HQL. HQL is an object-oriented query language, similar to SQL, but instead of operating on tables and columns, HQL works with persistent objects …Oct 12, 2023. In the vast realm of data management and manipulation, SQL (Structured Query Language) stands as a pivotal tool that has been embraced by developers, data analysts, and businesses ...SQL (Structured Query Language) is a programming language used to query and manipulate data stored in relational databases.The language is becoming increasingly popular as we find more and more ways to use data. Last year, SQL was the third most popular programming language used by developers who responded to Stack …This allowed you to expand or limit results based on some simple operators like AND, OR, or NOT. That Boolean Query example is one of the basic concepts behind something called Keyword Query Language, also known as KQL . If you would like to build more advanced searches and queries in SharePoint – you need to understand what it is …Kusto Query Language (KQL) is used to write queries in Azure Data Explorer, Azure Monitor Log Analytics, Azure Sentinel, and more. This tutorial is an introduction to the essential KQL operators used to access and analyze your data. For more specific guidance on how to query logs in Azure Monitor, see Get started with log queries. Note that the Power Query formula language is case sensitive. Each query formula step builds upon a previous step by referring to a step by its variable name. Output a query formula step using the in statement. Generally, the last query step is used as the in final data set result. To learn more about expressions and values, go to Expressions ... Structured Query Language (SQL) is a standardized programming language that is used to manage relational databases and perform various operations on the data in them. Initially created in the 1970s, SQL is regularly used not only by database administrators but also by developers writing data integration scripts and data analysts looking to set ... SQL to Kusto cheat sheet. Related content. If you're familiar with SQL and want to learn KQL, translate SQL queries into KQL by prefacing the SQL query with a comment line, --, and the keyword explain. The output shows the KQL version of the query, which can help you understand the KQL syntax and concepts. Run the query.A few words about Cypher. Cypher is like SQL a declarative, textual query language, but for graphs. It consists of clauses, keywords and expressions like predicates and functions, many of which will be familiar (like WHERE, ORDER BY, SKIP LIMIT, AND, p.unitPrice > 10 ). Unlike SQL, Cypher is all about expressing graph patterns.SQL is one of the key underpinnings of modern information technology. We need a declarative query language for the powerful – and distinct – property graph data model, to play a similar role. Many graph databases and services are not features of relational systems, but native, optimized implementations. And many graph queries, …CQL and ECQL ¶. CQL and ECQL. ¶. CQL (Common Query Language) is a query language created by the OGC for the Catalogue Web Services specification . Unlike the XML-based Filter Encoding language, CQL is written using a familiar text-based syntax. It is thus more readable and better-suited for manual authoring. However, CQL has …SQL is one of the key underpinnings of modern information technology. We need a declarative query language for the powerful – and distinct – property graph data model, to play a similar role. Many graph databases and services are not features of relational systems, but native, optimized implementations. And many graph queries, …Query language is a computer programming language used to retrieve information from a database. Learn about the different types of query languages, such as menu, fill …SQL คืออะไร. Structured Query Language (SQL) เป็นภาษาโปรแกรมสำหรับจัดเก็บและประมวลผลข้อมูลในฐานข้อมูลแบบเชิงสัมพันธ์ ฐานข้อมูลแบบเชิงสัมพันธ์ ...Definition 3.1. (LLM-enhanced Query Rewrite): Given a large language model , a textual instruction outlining the rewrite task , a set of candidate rules , one successful rewrite …SQL (Structured Query Language) allows programmers to query, update and reorganize data while modifying database schema to control data accessibility.Welcome to SQL. SQL, or Structured Query Language, is a language specifically designed for accessing and interacting with databases. It allows users to create tables, modify data, and retrieve information in a fast and efficient manner. SQL is one of the most popular query languages in use today.Episode Notes. On this week’s episode, the panel is first joined by Slate’s music critic, Carl Wilson, to puzzle over The Tortured Poets Department, Taylor Swift’s …Các kiểu dữ liệu trong ngôn ngữ SQL, một trong những ngôn ngữ truy vấn phổ biến nhất với các lập trình viên. Ngôn ngữ truy vấn (tiếng Anh: Query language) là tên gọi chung để chỉ các ngôn ngữ máy tính được dùng để tạo các truy vấn trong các cơ sở dữ liệu và các hệ thống thông tin.
There are 6 modules in this course. In this course you will learn all about the Structured Query Language ("SQL".) We will review the origins of the language and its conceptual foundations. But primarily, we will focus on learning all the standard SQL commands, their syntax, and how to use these commands to conduct analysis of the data within a .... How to get free cash
Short Overview on SQL. Structured Query Language (SQL), as we all know, is the database language by the use of which we can perform certain operations on the …Note. If you're collecting data from at least one virtual machine, you can work through this exercise in your own environment. For other scenarios, use our demo environment, which includes plenty of sample data.. If you already know how to query in Kusto Query Language (KQL) but need to quickly create useful queries based on …The first database query language to be certified by ISO since SQL in 1987, the new standard was developed by a group of database vendors, academics, and tech …According to Microsoft: KQL is the default query language for building search queries. Using KQL, you specify the search terms or property restrictions that are passed to the SharePoint search service. Basically, it’s a language you can use for searching things in SharePoint by using search terms and property restrictions.Gremlin Query Language. Gremlin is JanusGraph’s query language used to retrieve data from and modify data in the graph. Gremlin is a path-oriented language which succinctly expresses complex graph traversals and mutation operations. Gremlin is a functional language whereby traversal operators are chained together to form path-like expressions.Use advanced search with Jira Query Language (JQL) | Jira Service ...KQL is a feature-rich query language powered by the Kusto Enginethat allows you to filter, sort, and aggregate data. It was built for the cloud and designed to play well with large data sets, allowing them to be analysed efficiently. KQL is the primary tool used to query Application Insights Logs, however, it’s useful to know that KQL is not ... A fourth-generation programming language ( 4GL) is a high-level computer programming language that belongs to a class of languages envisioned as an advancement upon third-generation programming languages (3GL). Each of the programming language generations aims to provide a higher level of abstraction of the internal computer hardware details ... Tutorial: Getting Started with Cypher ® explains the basic concepts of Cypher, Neo4j’s query language, including how to create and query graphs. This tutorial is based on the Movie Graph.You’ll find out how to create, query, and delete data in Neo4j. Tutorial: Build a Cypher Recommendation Engine uses examples from the Movie Graph and shows how …Query by Example (QBE) QBE is a high-level, visual query language that allows users to form queries using examples rather than strict syntax. Its graphical nature makes it user-friendly, particularly for non-technical users. XQuery. XQuery is a functional language specifically designed to query XML data.According to Microsoft: KQL is the default query language for building search queries. Using KQL, you specify the search terms or property restrictions that are passed to the SharePoint search service. Basically, it’s a language you can use for searching things in SharePoint by using search terms and property restrictions.Query language is what allows us to actually take action on databases. It allows us to create, read, update and delete items on our database, as well as more advanced queries like filtering and counting. Structured Query Language (SQL) is the most famous of the query languages.The query string “mini-language” is used by the Query string and by the q query string parameter in the search API. The query string is parsed into a series of terms and operators . A term can be a single word — quick or brown — or a phrase, surrounded by double quotes — "quick brown" — which searches for all the words in the phrase, in the …Gremlin Query Language. Gremlin is JanusGraph’s query language used to retrieve data from and modify data in the graph. Gremlin is a path-oriented language which succinctly expresses complex graph traversals and mutation operations. Gremlin is a functional language whereby traversal operators are chained together to form path-like expressions.A query language is a specialized programming language for searching and changing the contents of a database. Essentially, a query language is a computer programing language that is used for the purpose of retrieving information or data from a database. Even though the term originally refers to a sublanguage for only searching (querying) the ...Mar 28, 2022 · Graph Query Language, or GQL, is a proposed standard that merges similar declarative languages like Cypher, PGQL, and GSQL. Developers create queries by specifying a particular model for a set of ... SQL. Structured Query Language ( SQL) ( / ˌɛsˌkjuːˈɛl / ⓘ S-Q-L, often / ˈsiːkwəl / "sequel" for historical reasons [clarification needed]) [4] [5] is a domain-specific language used to …ภาษาสอบถาม (อังกฤษ: query language, data query language หรือ database query language; DQL) เป็นภาษา ....