這是因為使用union的兩個SQL語句產生的記錄的表結構不一致. 必須是結構完全一致的記錄集合才可以使用UNION.
以上就是兩個表的字段不一樣，導致，所以大家可以檢查下。
sql語句遇到錯誤： The used SELECT statements have a different number of columns :
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