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mysql三表关联分组带where_MySQL

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2016-06-01 13:30:021196browse

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mysql三表关联分组带where

 

mysql 

 

查不出来： 

SELECT e.id,e.ename,COUNT(s.id) AS total FROM enterprise e LEFT JOIN comm_port p ON e.id = p.eid LEFT JOIN sendedoutbox s  ON p.port = s.CommPort WHERE s.SendTime BETWEEN '2013-08-09 15:31:35' AND '2013-08-28 10:47:28'  GROUP BY p.eid ORDER BY total DESC

 

 

正确能查出来： 

SELECT e.id,e.ename,COUNT(s.id) AS total FROM enterprise e LEFT JOIN comm_port p ON e.id = p.eid LEFT JOIN (SELECT * FROM sendedoutbox s WHERE s.SendTime BETWEEN '2013-08-09 15:31:35' AND '2013-08-28 10:47:28') s  ON p.port = s.CommPort GROUP BY p.eid ORDER BY total DESC

 

 

 

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