MySQL not equal to operator <> && !=

MySQL :: MySQL 5.7 Reference Manual :: 12.3.2 Comparison Functions and Operators
https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html

MySQL not equal to operator - w3resource
https://www.w3resource.com/mysql/comparision-functions-and-operators/not-equal-operator.php

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原文地址：https://www.cnblogs.com/rgqancy/p/11080728.html