group by 列错了 SELECT a.*,b.A3 FROM a INNER JOIN (SELECT B1,A3=COUNT(1) FROM B GROUP BY B1) AS b ON a.A1=b.B1
SELECT a.*,b.A3 FROM a INNER JOIN (SELECT B1,A3=COUNT(1) FROM B GROUP BY B1) AS b ON a.A1=b.B1
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