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JOIN(7种JOIN)
JOIN(7种JOIN) INNER JOIN SELECT FROM TBL1 INNER JOIN TBL2 ON TBL1.KEY = TBL2.KEY LEFT JOIN SELECT FROM TBL1 LEFT JOIN TBL2 ON TBL1.KEY = TBL2.KEY LEFT JOIN(排除交集) SELECT FROM TBL1 JOIN TBL2 ON TBL1.KEY = TBL2.KEY WHERE TBL2.KEY IS NULL