GAUSS-00280：INTO is only allowed on first SELECT of UNION/INTERSECT/EXCEPT SQLSTATE: 42601
错误码
错误描述：INTO is only allowed on first SELECT of UNION/INTERSECT/EXCEPT SQLSTATE: 42601
错误原因：语法解析错误：INTO子句在SELECT..UNION/INTERSECT/EXCEPT语句中的位置错误。
解决方法：INTO只能出现在SELECT..UNION/INTERSECT/EXCEPT语句中，不能出现在SELECT..UNION/INTERSECT/EXCEPT..SELECT的第二个select子句中。
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