相关疑难解决方法(0)

当存储在变量中的单个值时,以下工作正常.

SET @a := "20100630";
SELECT * FROM wordbase WHERE verified = @a;

但是当变量中存储多个值时,它不起作用.

SET @a := "'20100630', '20100701' ";
SELECT * FROM wordbase WHERE verified in (@a);

我需要为此准备好的陈述吗？