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MySQL:
IS NULL
Syntax:
IS NULL
Tests whether a value is NULL.
Example
mysql> SELECT 1 IS NULL, 0 IS NULL, NULL IS NULL;
-> 0, 0, 1
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Syntax:
IS NULL
Tests whether a value is NULL.
mysql> SELECT 1 IS NULL, 0 IS NULL, NULL IS NULL;
-> 0, 0, 1