What is asterisk in sql, Database Management System

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What is Asterisk in SQL?

Asterisk (*): In SQL, the columns for all the tables and views in the FROM clause will be displayed.


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Why 'AS' clause is used in SQL ? 'As' clause is used for Rename operation. ‘AS' clause is used in SQL for rename operation. (e.g., SELECT ENO AS EMPLOYEE_NO FROM EMP)

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