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Not Exits in MySql

The NOT EXITS is similar to NOT IN.

The NOT EXITS is faster than NOT IN.

The NOT EXITS used to check whether the result of a correlated nested query is empty or not.

The NOT EXITS will return TRUE if there is no result in the nested query.

Example

SELECT * FROM suppliers s WHERE NOT EXITS (SELECT o.name FROM orders o WHERE s.sid=o.sid);

 

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