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Not equal « Comparison Functions Operators « MySQL Tutorial
MySQL Tutorial
Comparison Functions Operators
Not equal
15.13.Not equal
15.13.1.
Not equal: <> or !=
15.13.2.
Data type conversion in Not equal operator
15.13.3.
SELECT .01 <> '0.01';
15.13.4.
Compare string value using the Not equal operator
15.13.5.
String comparisons are not case sensitive