The used SELECT statements have a different number of columns
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mysql遇到的问题,
原因:
select a, b, c, d into @a, @b from xxx;
into 后面的字段少了就会报标题的错误
也有其他情况也会遇到这样的错误:
http://www.myhack58.com/Article/html/3/7/2011/29898.htm
http://www.2cto.com/Article/201212/178290.html
总之是select中的参数个数不对
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