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mysql的char类型=0的判断

WBOY
WBOYOriginal
2016-06-06 20:32:471784browse

mysql的表有一列的类型是char(3) default (0),select xx = 0为什么可以搜索出来所有的值?

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mysql的表有一列的类型是char(3) default (0),select xx = 0为什么可以搜索出来所有的值?

收索条件如果是整数
那么mysql会吧字段的值先转成整数,然后再对比
如果字段的第一位是字符串,那么转成整数就是0了,
一般对字符串的收索都要加上引号
where xx = "131"

default(‘0’) 不是0 吧

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