DML (Data Manipulation Language) are SQL commands focused on handling data within the database, including most SQL statements. Let's look at some DML commands with a simple example for each command. i. INSERT INTO In SQL, theINSERT INTOstatement is used to insert new rows into a database ...
DDL Commands vs Other Types of Commands In the previous section, I explained how DDL commands define the structure of tables and update their contents or properties as needed. Other types ofSQL commands allow for selecting, aggregating, updating, and even joining tablesto get a different view of...
DCL(Data Control Language)语句:即数据控制语句,用于授权/撤销数据库及其字段的权限(DCL is short name of Data Control Language which includes commands such as GRANT and mostly concerned with rights, permissions and other controls of the database system.)。常用的语句关键字有:GRANT,REVOKE。 TCL(Transac...
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...
Welcome to the MariaDB monitor. Commands end with ; or \g. Your MySQL connection id is 9 Server version: 5.7.18-log MySQL Community Server (GPL) Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current...
SQL语句的分类 DDL(Data Definition Languages)语句:数据定义语言。这些语句定义了不同的数据段、 数据库、表、列、索引等数据库对象的定义。常用的语句关键字主要包括create、drop、alter 等。 DML(Data Manipulation Language)语句:数据操纵语句,用于添加、删除、更新和查 ...
Welcome to the MariaDB monitor. Commands end with ; or \g. Your MySQL connectionidis 9 Server version: 5.7.18-log MySQL Community Server (GPL) Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others. Type'help;'or'\h'forhelp. Type'\c'toclearthe current input statement....
Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 2 Server version: 5.5.68-MariaDB MariaDB Server Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input st...
OracleRAC.Valid keyword values are:[Y]andN.CONTENTSpecifies data to load.Valid keywords are:[ALL],DATA_ONLYandMETADATA_ONLY.DATA_OPTIONSData layer option flags.Valid keywords are:SKIP_CONSTRAINT_ERRORS.DIRECTORYDirectory object to be usedfordump,log andSQLfiles.DUMPFILEListofdump files toimport...
本端和遠端資料庫必須使用相同的 Db2 for z/OS 版本。 -wlm 產生WLM 特定的 DDL 輸出,可用來產生下列項目的 CREATE 及 ALTER 陳述式: 直方圖 服務類別 臨界值 WLM 事件監視器 工作量 工作動作集 工作類別集 -wrap 為常式、觸發程式、視圖及 PL/SQL 套件產生 DDL 陳述式的模糊化版本。 -wrapper Wname 為...