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Data Definition Language (DDL)

Data Definition Language (DDL) is a standard for commands that define the different structures in a database. DDL statements create, modify, and remove database objects such as tables, indexes, and users. Common DDL statements are CREATE, ALTER, and DROP.

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Mark Whitehorn explains the difference between data definition language (DDL) and data manipulation language (DML).

This was last updated in April 2009

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strong entity :- an entity set having an attributes, which can be used as conditare key or primary key it is called strong entity set
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