UNION关键字报错：ERROR 1222 (21000): The used SELECT statements have a different number of columns
今天进行总结时，发现这个错误，后来，发现这是因为union 形成。 web 在使用union时，有如下规则。 1.必须由两条或者两条以上的select语句组成，语句之间用关键字union分隔 2.每一个查询中必须包含相同的列，表达式或汇集函数(顺序能够不一样) 3.列数据类型必须兼容，类型没必要彻底相同，但必须是DBMS能够隐含地转换的类型。svg 其中上面的错误就是犯了第二条的规则。图中给出了标
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