MySQL :: MySQL 5.7 Reference Manual :: 12.3.2 Comparison Functions and Operatorshttps://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html MySQL not equal to operator - w3resourcehttps://www.w3resource.com/mysql/comparision-functions-and-opera…
参考:Function and Operator Reference Name Description ABS() Return the absolute value ACOS() Return the arc cosine ADDDATE() Add time values (intervals) to a date value ADDTIME() Add time AES_DECRYPT() Decrypt using AES AES_ENCRYPT() Encrypt using AES…
操作符 <=> NULL-safe equal. This operator performs an equality comparison like the = operator, but returns 1 rather than NULL if both operands are NULL, and 0 rather than NULL if one operand is NULL. NULL安全的相等比较操作符.这个操作符和'='操作符一样用来执行相等的比较,但返回1而不是NULL如果…
Name Description ABS() Return the absolute value ACOS() Return the arc cosine ADDDATE() Add time values (intervals) to a date value ADDTIME() Add time AES_DECRYPT() Decrypt using AES AES_ENCRYPT() Encrypt using AES AND, && Logical AND ANY_VALUE()…
官网描述 NULL-safe equal. This operator performs an equality comparison like the = operator, but returns 1 rather than NULL if both operands are NULL, and 0 rather than NULL if one operand is NULL. NULL-安全相等.此运算符执行类似于相等比较 =运算符,差别是: 如果两个操作数都是NULL则返回1,而不是N…
