隐式转换

参考资料MySQL :: MySQL 8.0 Reference Manual :: 14.3 Type Conversion in Expression Evaluation MySQL 避坑指南之隐式数据类型转换_mysql隐式转换整数转浮点数-CSDN博客 MySQL隐式转化整理 - Rollen Holt - 博客园 (cnblogs.com) 场景当两个字段类型不同，但要对他们进行运算，则会隐式的对其进行转换 文档原文： If one or both arguments are NULL, the result of the comparison is NULL, except for the NULL-safe <=> equality comparison operator. For NULL <=> NULL, the result is true. No conversion is needed. 有一方类型为NULL，结果即为NULL，除非是太空船运算，NULL <=> NULL结果为true If both a ...