这是四个。
GROUP BY <all_columns>
SELECt * FROM T INTERSECT SELECt * FROM T
SELECt * FROM T UNIOn SELECt * FROM T
SELECt * FROM T EXCEPT SELECt * FROM T WHERe 1 = 0
这是四个。
GROUP BY <all_columns>
SELECt * FROM T INTERSECT SELECt * FROM T
SELECt * FROM T UNIOn SELECt * FROM T
SELECt * FROM T EXCEPT SELECt * FROM T WHERe 1 = 0
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