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查询SQL两个表做join操作的时候出现如下问题
Error Code: 1267. Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '='
解决方法：
使用转换函数：
CONVERT(b.fullCode USING utf8) COLLATE utf8_unicode_ci具体案例：
select from table1 as t1 left join table2 as t2 on t1.`key` = CONVERT(t2.indicator_id USING utf8) COLLATE utf8_unicode_ci;