Question

我希望记录能够毫无疑问地进入。请帮我。谢谢你。

SELECT 
    ROUTE_ID,
    ISNULL(COUNT(*), 0) AS TOTAL_CALL
FROM 
    dbo.tblCall_Report AR 
CROSS JOIN 
    tblRoute R 
INNER JOIN 
    tblNotification_Report BR ON R.ROUTE_ID = BR.RouteID
WHERE 
    CAST(BR.NotificationDateTime AS DATE) = '04.01.2017'
    AND BR.CallNotification = 1 
    AND (BR.NotificationStatus = 1 OR BR.NotificationStatus IS NULL)
    AND BR.RouteID IN (7434,7423)
GROUP BY 
    ROUTE_ID

tblCall_Report

NotificationDateTime
----------------------
2017-04-01

tblNotification_Report

NotificationDateTime     RouteID
--------------------------------
2017-04-01                 7434

结果：

ROUTE_ID  | TOTAL_CALL
----------+-----------
   7434   |      1

我想要这些结果：

ROUTE_ID | TOTAL_CALL
---------+-----------
   7434  |    1    
   7423  |    0

Answer 1

如果原始表中存在路由7423，那么我的猜测是INNER JOIN正在过滤此路由。改为使用LEFT JOIN：

SELECT ROUTE_ID,
       ISNULL(COUNT(*),0) AS TOTAL_CALL
FROM dbo.tblCall_Report AR
CROSS JOIN tblRoute R
LEFT JOIN tblNotification_Report BR
    ON R.ROUTE_ID = BR.RouteID AND
       BR.RouteID IN (7434, 7423)
WHERE CAST(BR.NotificationDateTime AS DATE) = '04.01.2017' AND
      BR.CallNotification = 1 AND
      (BR.NotificationStatus =1 OR BR.NotificationStatus IS NULL)
GROUP BY ROUTE_ID

Answer 2

您应该使用LEFT OUTER JOIN，并且需要相应地修改WHERE子句。检查以下查询选择 ROUTE_ID， SUM（如果BR.RouteID不为1，则为0结束时的情况）为TOTAL_CALL 从 dbo.tblCall_Report AR 交叉加入 tblRoute R. LEFT JOIN tblNotification_Report BR ON R.ROUTE_ID = BR.RouteID AND CAST（BR.NotificationDateTime AS DATE）=＆＃39; 04.01.2017＆＃39; AND BR.CallNotification = 1 AND（BR.NotificationStatus = 1或BR.NotificationStatus IS NULL）在哪里R.Route_ID IN（7434,7423）通过...分组 ROUTE_ID 以下是我得到的结果。希望这能帮到你。

Answer 3

你需要：

使用left join
使用您的可空值将操作数移动到on
使用R在哪里，因为它肯定有价值 SELECT ROUTE_ID, CASE ISNULL(MIN(BR.RouteID), 0) WHEN 0 THEN 0 ELSE COUNT(*) END AS TOTAL_CALL FROM dbo.tblCall_Report AR CROSS JOIN tblRoute R LEFT JOIN tblNotification_Report BR ON R.ROUTE_ID = BR.RouteID AND CAST(BR.NotificationDateTime AS DATE) = '04.01.2017' AND BR.CallNotification = 1 AND (BR.NotificationStatus = 1 OR BR.NotificationStatus IS NULL) GROUP BY WHERE R.RouteID IN (7434,7423) ROUTE_ID

SQL - 查询不存在的记录为NULL

3 个答案: