SQL Reference
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Quick Reference

The MySQL NULLIF() function compares two expressions and returns NULL if they are equal. Otherwise, the first expression is returned.

SELECT NULLIF(5, 25);

Output

NULLIF(5, 25)
5

Syntax

NULLIF(expr1, expr2)

SQL Notes:

  • Any work being done to modify the structure of a database or delete tables or the the database itself should only be done after making a recent backup
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