Question

propertyid  userid  shareddatetime
32          129     2015-02-03 11:09:33
33          129     2015-02-03 11:28:20
30          128     2015-02-03 11:33:02
32          128     2015-02-02 13:30:44
33          127     2015-02-02 13:40:44
30          128     2015-02-03 11:31:54

以上结果来自查询：

SELECT propertyid,userid,shareddatetime FROM `groupsharing` gs WHERE gs.groupid IN( SELECT `groupnum` FROM `groupuser` WHERE user = 129 ) AND gs.shareddatetime = (SELECT MIN(shareddatetime) FROM groupsharing gs2 WHERE gs.propertyid = gs2.propertyid )
     UNION 
    SELECT property,user,shareddatetime FROM sharing WHERE `shareduser` = '129' and `shareddatetime` = ( select min( `shareddatetime` ) from sharing s2 where s2.`shareduser` = sharing.`shareduser` and s2.`property` = sharing.`property` )

现在，如何从上述结果中选择具有最小共享日期时间的propertyid？

我的预期结果如下：

  propertyid  userid  shareddatetime
      32        128     2015-02-02 13:30:44
      33        127     2015-02-02 13:40:44
      30        128     2015-02-03 11:31:54

提前致谢

Answer 1

你可以试试这个：

Select a.propertyid, a.userid, min(a.shareddatetime) 
  from (SELECT propertyid,userid,shareddatetime 
           FROM `groupsharing` gs WHERE gs.groupid IN(SELECT `groupnum` FROM `groupuser` WHERE user = 129 ) AND gs.shareddatetime = (SELECT MIN(shareddatetime) FROM groupsharing gs2 WHERE gs.propertyid = gs2.propertyid )
        UNION 
        SELECT property,user,shareddatetime 
           FROM sharing WHERE `shareduser` = '129' and `shareddatetime` = ( select min( `shareddatetime` ) from sharing s2 where s2.`shareduser` = sharing.`shareduser` and s2.`property` = sharing.`property` )
        ) as a group by a.propertyid, a.userid;

Answer 2

上述答案如下：

SELECT propertyid，userid，shareddatetime FROM（SELECT propertyid，userid，shareddatetime FROM groupsharing gs WHERE gs.groupid IN（SELECT groupnum FROM groupuser WHERE user = 129）AND gs。 shareddatetime =（SELECT MIN（shareddatetime）FROM groupsharing gs2 WHERE gs.propertyid = gs2.propertyid）UNION SELECT属性，user，shareddatetime FROM sharing WHERE shareduser =＆＃39; 129＆＃39; AND shareddatetime =（SELECT min（shareddatetime）FROM sharing s2 WHERE s2。shareduser = sharing。shareduser AND s2。property = sharing。property））u 在哪里。shareddatetime =（SELECT MIN（shareddatetime）from（SELECT propertyid，userid，shareddatetime FROM groupsharing gs WHERE gs.groupid IN（SELECT groupnum FROM groupuser WHERE user = 129）AND gs.shareddatetime =（SELECT MIN（shareddatetime）FROM groupsharing gs2 WHERE gs.propertyid = gs2.propertyid）UNION SELECT属性，user，shareddatetime FROM sharing WHERE shareduser =＆＃39; 129＆＃39; AND shareddatetime =（SELECT min（shareddatetime）FROM sharing s2 WHERE s2。shareduser = sharing。shareduser AND s2。property = sharing。{{1 }））ui WHERE u.propertyid = ui.propertyid）

如何使用UNION子句结果作为表

2 个答案: