UNION或不UNION

时间：2017-07-03 18:23:02

标签： sql sql-server ssrs-2012

我目前遇到了UNION子句的问题。我想弄清楚我每天要导入多少订单。问题是，我有两个表，这些订单存储在OLDORDERHEADER和ORDERHEADER中。订单完成后，它会从ORDERHEADER表移动到OLD。两者都有完全相同的列，所以我想我会使用UNION子句并且没问题。好吧，一旦我运行我的查询，它打印两行，相同的日期和不同的qtys'。这是可以预料的，我只想将它们组合成一行，每小时数量的总和。 以下是我的工作内容：

SELECT CONVERT(varchar(8),recvtime,1) AS 'Day', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 0 THEN 1 ELSE 0 END) AS '12AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 1 THEN 1 ELSE 0 END) AS '1AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 2 THEN 1 ELSE 0 END) AS '2AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 3 THEN 1 ELSE 0 END) AS '3AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 4 THEN 1 ELSE 0 END) AS '4AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 5 THEN 1 ELSE 0 END) AS '5AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 6 THEN 1 ELSE 0 END) AS '6AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 7 THEN 1 ELSE 0 END) AS '7AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 8 THEN 1 ELSE 0 END) AS '8AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 9 THEN 1 ELSE 0 END) AS '9AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 10 THEN 1 ELSE 0 END) AS '10AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 11 THEN 1 ELSE 0 END) AS '11AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 12 THEN 1 ELSE 0 END) AS '12PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 13 THEN 1 ELSE 0 END) AS '1PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 14 THEN 1 ELSE 0 END) AS '2PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 15 THEN 1 ELSE 0 END) AS '3PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 16 THEN 1 ELSE 0 END) AS '4PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 17 THEN 1 ELSE 0 END) AS '5PM',
SUM(CASE WHEN DATEPART(hour,recvtime) = 18 THEN 1 ELSE 0 END) AS '6PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 19 THEN 1 ELSE 0 END) AS '7PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 20 THEN 1 ELSE 0 END) AS '8PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 21 THEN 1 ELSE 0 END) AS '9PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 22 THEN 1 ELSE 0 END) AS '10PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 23 THEN 1 ELSE 0 END) AS '11PM'

FROM MCK_HVS.OLDORDERHEADER WITH(NOLOCK)

WHERE CAST(recvtime as DATE) = CAST(GETDATE() as DATE)

GROUP BY CONVERT(varchar(8),recvtime,1)

UNION

SELECT CONVERT(varchar(8),recvtime,1) AS 'Day', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 0 THEN 1 ELSE 0 END) AS '12AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 1 THEN 1 ELSE 0 END) AS '1AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 2 THEN 1 ELSE 0 END) AS '2AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 3 THEN 1 ELSE 0 END) AS '3AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 4 THEN 1 ELSE 0 END) AS '4AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 5 THEN 1 ELSE 0 END) AS '5AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 6 THEN 1 ELSE 0 END) AS '6AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 7 THEN 1 ELSE 0 END) AS '7AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 8 THEN 1 ELSE 0 END) AS '8AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 9 THEN 1 ELSE 0 END) AS '9AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 10 THEN 1 ELSE 0 END) AS '10AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 11 THEN 1 ELSE 0 END) AS '11AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 12 THEN 1 ELSE 0 END) AS '12PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 13 THEN 1 ELSE 0 END) AS '1PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 14 THEN 1 ELSE 0 END) AS '2PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 15 THEN 1 ELSE 0 END) AS '3PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 16 THEN 1 ELSE 0 END) AS '4PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 17 THEN 1 ELSE 0 END) AS '5PM',
SUM(CASE WHEN DATEPART(hour,recvtime) = 18 THEN 1 ELSE 0 END) AS '6PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 19 THEN 1 ELSE 0 END) AS '7PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 20 THEN 1 ELSE 0 END) AS '8PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 21 THEN 1 ELSE 0 END) AS '9PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 22 THEN 1 ELSE 0 END) AS '10PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 23 THEN 1 ELSE 0 END) AS '11PM'

FROM MCK_HVS.ORDERHEADER WITH(NOLOCK)

WHERE CAST(recvtime as DATE) = CAST(GETDATE() as DATE)

GROUP BY CONVERT(varchar(8),recvtime,1)

ORDER BY CONVERT(varchar(8),recvtime,1)desc

4 个答案:

答案 0 :(得分：3)

无需编写整个查询两次，您可以将union用作派生表（或cte）并执行group by并且只加一次：

;WITH CTE AS
(
    SELECT recvtime
    FROM MCK_HVS.OLDORDERHEADER WITH(NOLOCK)
    WHERE CAST(recvtime as DATE) = CAST(GETDATE() as DATE)

    UNION 

    SELECT recvtime
    FROM MCK_HVS.ORDERHEADER WITH(NOLOCK)
    WHERE CAST(recvtime as DATE) = CAST(GETDATE() as DATE)
)    

SELECT CONVERT(varchar(8),recvtime,1) AS 'Day', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 0 THEN 1 ELSE 0 END) AS '12AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 1 THEN 1 ELSE 0 END) AS '1AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 2 THEN 1 ELSE 0 END) AS '2AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 3 THEN 1 ELSE 0 END) AS '3AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 4 THEN 1 ELSE 0 END) AS '4AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 5 THEN 1 ELSE 0 END) AS '5AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 6 THEN 1 ELSE 0 END) AS '6AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 7 THEN 1 ELSE 0 END) AS '7AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 8 THEN 1 ELSE 0 END) AS '8AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 9 THEN 1 ELSE 0 END) AS '9AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 10 THEN 1 ELSE 0 END) AS '10AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 11 THEN 1 ELSE 0 END) AS '11AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 12 THEN 1 ELSE 0 END) AS '12PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 13 THEN 1 ELSE 0 END) AS '1PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 14 THEN 1 ELSE 0 END) AS '2PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 15 THEN 1 ELSE 0 END) AS '3PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 16 THEN 1 ELSE 0 END) AS '4PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 17 THEN 1 ELSE 0 END) AS '5PM',
SUM(CASE WHEN DATEPART(hour,recvtime) = 18 THEN 1 ELSE 0 END) AS '6PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 19 THEN 1 ELSE 0 END) AS '7PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 20 THEN 1 ELSE 0 END) AS '8PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 21 THEN 1 ELSE 0 END) AS '9PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 22 THEN 1 ELSE 0 END) AS '10PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 23 THEN 1 ELSE 0 END) AS '11PM'

FROM CTE 
GROUP BY CONVERT(varchar(8),recvtime,1)
ORDER BY CONVERT(varchar(8),recvtime,1) DESC

答案 1 :(得分：2)

您可能还会考虑使用PIVOT来获得更简洁的语法。

我发现使用UNION可疑，并假设您实际上也需要UNION ALL。

WITH CombinedOrderHeader
     AS (SELECT recvtime
         FROM   ORDERHEADER
         UNION ALL
         SELECT recvtime
         FROM   oldORDERHEADER),
     PvtSource(htt, Day)
     AS (SELECT FORMAT(recvtime, 'htt'),
                CONVERT(VARCHAR(8), recvtime, 1)
         FROM   CombinedOrderHeader
         WHERE  recvtime >= CAST(GETDATE() AS DATE)
                AND recvtime < DATEADD(DAY, 1, CAST(GETDATE() AS DATE)))
SELECT *
FROM   PvtSource PIVOT (COUNT(htt) FOR htt IN ([12AM], [1AM], [2AM], [3AM], [4AM], [5AM], 
                                               [6AM], [7AM], [8AM], [9AM], [10AM], [11AM], 
                                               [12PM], [1PM], [2PM], [3PM], [4PM], [5PM], 
                                               [6PM], [7PM], [8PM], [9PM], [10PM], [11PM] 
                                             )) P

答案 2 :(得分：0)

试试这个。

SELECT
    DAY,
    SUM(12AM) AS [12AM]
    .
    .
    .
    .
    .
    .
FROM (
SELECT CONVERT(varchar(8),recvtime,1) AS 'Day', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 0 THEN 1 ELSE 0 END) AS '12AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 1 THEN 1 ELSE 0 END) AS '1AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 2 THEN 1 ELSE 0 END) AS '2AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 3 THEN 1 ELSE 0 END) AS '3AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 4 THEN 1 ELSE 0 END) AS '4AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 5 THEN 1 ELSE 0 END) AS '5AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 6 THEN 1 ELSE 0 END) AS '6AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 7 THEN 1 ELSE 0 END) AS '7AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 8 THEN 1 ELSE 0 END) AS '8AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 9 THEN 1 ELSE 0 END) AS '9AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 10 THEN 1 ELSE 0 END) AS '10AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 11 THEN 1 ELSE 0 END) AS '11AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 12 THEN 1 ELSE 0 END) AS '12PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 13 THEN 1 ELSE 0 END) AS '1PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 14 THEN 1 ELSE 0 END) AS '2PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 15 THEN 1 ELSE 0 END) AS '3PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 16 THEN 1 ELSE 0 END) AS '4PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 17 THEN 1 ELSE 0 END) AS '5PM',
SUM(CASE WHEN DATEPART(hour,recvtime) = 18 THEN 1 ELSE 0 END) AS '6PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 19 THEN 1 ELSE 0 END) AS '7PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 20 THEN 1 ELSE 0 END) AS '8PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 21 THEN 1 ELSE 0 END) AS '9PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 22 THEN 1 ELSE 0 END) AS '10PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 23 THEN 1 ELSE 0 END) AS '11PM'

FROM MCK_HVS.OLDORDERHEADER WITH(NOLOCK)

WHERE CAST(recvtime as DATE) = CAST(GETDATE() as DATE)

GROUP BY CONVERT(varchar(8),recvtime,1)

UNION

SELECT CONVERT(varchar(8),recvtime,1) AS 'Day', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 0 THEN 1 ELSE 0 END) AS '12AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 1 THEN 1 ELSE 0 END) AS '1AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 2 THEN 1 ELSE 0 END) AS '2AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 3 THEN 1 ELSE 0 END) AS '3AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 4 THEN 1 ELSE 0 END) AS '4AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 5 THEN 1 ELSE 0 END) AS '5AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 6 THEN 1 ELSE 0 END) AS '6AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 7 THEN 1 ELSE 0 END) AS '7AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 8 THEN 1 ELSE 0 END) AS '8AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 9 THEN 1 ELSE 0 END) AS '9AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 10 THEN 1 ELSE 0 END) AS '10AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 11 THEN 1 ELSE 0 END) AS '11AM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 12 THEN 1 ELSE 0 END) AS '12PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 13 THEN 1 ELSE 0 END) AS '1PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 14 THEN 1 ELSE 0 END) AS '2PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 15 THEN 1 ELSE 0 END) AS '3PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 16 THEN 1 ELSE 0 END) AS '4PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 17 THEN 1 ELSE 0 END) AS '5PM',
SUM(CASE WHEN DATEPART(hour,recvtime) = 18 THEN 1 ELSE 0 END) AS '6PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 19 THEN 1 ELSE 0 END) AS '7PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 20 THEN 1 ELSE 0 END) AS '8PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 21 THEN 1 ELSE 0 END) AS '9PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 22 THEN 1 ELSE 0 END) AS '10PM', 
SUM(CASE WHEN DATEPART(hour,recvtime) = 23 THEN 1 ELSE 0 END) AS '11PM'

FROM MCK_HVS.ORDERHEADER WITH(NOLOCK)

WHERE CAST(recvtime as DATE) = CAST(GETDATE() as DATE)

GROUP BY CONVERT(varchar(8),recvtime,1)) AS [SOURCE]

ORDER BY 1 desc

答案 3 :(得分：0)

http://sqlfiddle.com/#!6/defd2/9 

 SELECT COUNT(ID), CASE WHEN HOUR < 12 THEN CONVERT(VARCHAR(2),HOUR) + 'AM' 
                ELSE CONVERT(VARCHAR(2),HOUR-12) + 'PM' END 
   FROM (
          SELECT id, DATEPART(hour,recvtime) AS HOUR FROM ORDERHEADER 
              UNION 
          SELECT id, DATEPART(hour,recvtime) AS HOUR FROM oldORDERHEADER ) A
     GROUP BY A.HOUR
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