In this article, you will learn the SQL command categories and their sub-categories. SQL is an open-source data management system. The SQL query is used to retrieve and manipulate the data from the table. With the help of SQL commands, we can query, filter, sort, join, group and modify...
DML, DDL, TCL and DQL and it’s subtypes. We’ve gone through each command in detail with its syntax and example that will assist you in writing queries. The SQL commands’ allows you to construct and manipulate a wide range of database objects with the different commands. After going th...
SQL Data Control Language (DCL)https://www.tutorialride.com/dbms/sql-data-control-language-dcl.htm Explain Data Control Language (DCL) with Examples in DBMShttps://whatisdbms.com/explain-data-control-language-dcl-with-examples-in-dbms/
6.GRANT - gives user's access privileges to database 授权 7.REVOKE - withdraw access privileges given with the GRANT command 收回已经授予的权限 DML DML is Data Manipulation Language statements. Some examples:数据操作语言,SQL中处理数据等操作统称为数据操纵语言 1.SELECT - retrieve data from the a...
DDL Commands in SQL with Examples Here are code snippets and their corresponding outputs for DDL commands: SQL CommandCode SnippetOutput CREATE TABLECREATE TABLE Employees ( EmployeeID INT PRIMARY KEY, FirstName VARCHAR(50), LastName VARCHAR(50), Department VARCHAR(50) );New “Employees” table ...
一、DDL is Data Definition Language statements. Some examples:数据定义语言,用于定义和管理 SQL 数据库中的所有对象的语言 CREATE- to create objects in the database 创建 ALTER- alters the structure of the database 修改 DROP- delete objects from the database 删除 ...
The following table shows some of the TCL commands and their examples: 6. Conclusion In this article, we’ve explored the different categories of SQL commands: DDL, DML, DCL, and TCL, and their respective functionalities. Understanding these categories is essential for effectively managing and man...
关系数据库的语言分三类,它们是(数据描述语言DDL)、(数据操纵语言DML)和(数据控制语言DCL),而SQL是(集DDL、DML、DCL为一体)的标准关系数据库语言。 DDL is Data Definition Language statements. Some examples: CREATE - to create objects in the database ...
一、数据安全性 1.用户表示和鉴别 2.存取控制 3.定义视图 4.审计 5.数据加密 二、服务器级安全: 登入名(windows账号登入、账号密码登入) 默认登入账号:1.BUILTIN\Administrators 2.sa(管理员账号,默认禁用,需启用) 创建SQLsever登入账号 crea ...
CALL - call a PL/SQL or Java subprogram EXPLAIN PLAN - explain access path to data LOCK TABLE - control concurrency DCL Data Control Language (DCL) statements. Some examples: GRANT - gives user's access privileges to database REVOKE - withdraw access privileges given with the GRANT command ...