MySQL 中的 COERCIBILITY(str) 函数用来返回字符串参数的排序规则强制值。
COERCIBILITY(str)
str 字符串
(1)COERCIBILITY() 函数的基本用法,如下:
mysql> SELECT COERCIBILITY(USER()); +----------------------+ | COERCIBILITY(USER()) | +----------------------+ | 3 | +----------------------+ 1 row in set (0.04 sec) mysql> SELECT COERCIBILITY('abc'); +---------------------+ | COERCIBILITY('abc') | +---------------------+ | 4 | +---------------------+ 1 row in set (0.04 sec) mysql> SELECT COERCIBILITY(1000); +--------------------+ | COERCIBILITY(1000) | +--------------------+ | 5 | +--------------------+ 1 row in set (0.04 sec)