返回空结果集的MySql查询_Mysql

返回空结果集的MySql查询

mysql

返回空结果集的MySql查询,mysql,Mysql,你好，我有以下两张桌子：设备表： deviceID accountID InstallTime fName lName 1 2 NULL Dave O'Riordan 2 2 NULL Kathrine Hutter 3 2 NULL Guy

你好，我有以下两张桌子：

设备表：

deviceID    accountID  InstallTime    fName         lName   
1            2          NULL          Dave          O'Riordan   
2            2          NULL          Kathrine      Hutter  
3            2          NULL          Guy           Swider

deviceID  companyID  contactID  stage   event   state   serverTime  clientTime  monetary
1            1          1        -1     CALL    OUT     1349445600  1349445600  4600
1           14         12        -1     CALL    OUT     1349449200 1349449200   5400
2           16         19        -1     CALL    OUT     1349445600 1349445600   4456
2           21         20        -1     CALL    OUT     1349449200 1349449200   4000
3           17         22        -1     CALL    OUT     1349447160 1349447160   12000
1            1          1         1     CALL    OUT     1349082060 1349082060   NULL
1           14         12         1     CHECK   IN      1349083380 1349083380   NULL
1            1          1         1     CHECK   IN      1349082660 1349082660   NULL
1           14         12         1     CHECK   OUT     1349085382 1349085382   NULL
1            1          1         1     CHECK   OUT     1349082700 1349082700   NULL

a2\u交易表：

deviceID    accountID  InstallTime    fName         lName   
1            2          NULL          Dave          O'Riordan   
2            2          NULL          Kathrine      Hutter  
3            2          NULL          Guy           Swider

deviceID  companyID  contactID  stage   event   state   serverTime  clientTime  monetary
1            1          1        -1     CALL    OUT     1349445600  1349445600  4600
1           14         12        -1     CALL    OUT     1349449200 1349449200   5400
2           16         19        -1     CALL    OUT     1349445600 1349445600   4456
2           21         20        -1     CALL    OUT     1349449200 1349449200   4000
3           17         22        -1     CALL    OUT     1349447160 1349447160   12000
1            1          1         1     CALL    OUT     1349082060 1349082060   NULL
1           14         12         1     CHECK   IN      1349083380 1349083380   NULL
1            1          1         1     CHECK   IN      1349082660 1349082660   NULL
1           14         12         1     CHECK   OUT     1349085382 1349085382   NULL
1            1          1         1     CHECK   OUT     1349082700 1349082700   NULL

我提出的问题如下：

SELECT deal.deviceID, devices.fName, devices.lName, SUM(event) AS visits
 FROM `a2_deal` AS deal
 LEFT JOIN `devices` AS devices ON deal.deviceID = devices.deviceID
 WHERE `event` LIKE 'CHECK' 
 AND `serverTime` >= 1349082060
 AND `serverTime` <= 1349190000
 GROUP BY deal.deviceID
 ORDER BY visits

选择deal.deviceID、devices.fName、devices.lName、SUM（事件）作为访问
从“a2_交易”到“交易”
将'devices'作为deal.deviceID=devices.deviceID上的设备左键联接
WHERE`event`LIKE'CHECK'
和'serverTime`>=1349082060
和'serverTime`=1349082060
以及带有
WHERE `stage` =  -1
AND `serverTime` >= 1349082060
AND `serverTime` <= 1349190000

其中`stage`=-1
和'serverTime`>=1349082060
和“服务器时间”而不是使用两个和
s，切换到之间
是的，你是对的..我在长期斗争后发现了它。。。非常感谢。