SQL COMMANDS

SQL COMMANDS:

SQL is basically designed to access, modify and extract the data from a relational database. According to the operations, the SQL commands are divided into the following:

• DDL ( Data Definition Language )

• DML ( Data Manipulation Language )

• DQL ( Data Query Language )

• DCL ( Data Control Language )

• TCL ( Transaction Control Language )

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Data Definition Language (DDL):

These are set of SQL commands used to define the schema in a database. the syntax of the DDL command is predefined to describe the data, simply DDL commands are used to create and modify the data in the database.

following are the five commands of Data Definition Language: