![]() Transactions are units of work that can be either committed or rolled back. TCS commands are used to manage transactions in a database. Examples of DCL commands include GRANT and REVOKE. Examples of DDL commands include CREATE and ALTER.ĭCL commands are used to control user permissions and access to a database. You can change the database schema by creating new tables and objects or altering their attributes (such as their data type, table name, etc.). Examples of DML commands include SELECT, INSERT, and UPDATE.ĭDL commands are used to define the structure of a database.
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