连接缺少值的SQL视图

Question

我在两个单独的服务器上有两个视图。

这些视图输出名称，月份，计数

一个人（Joe用户）的一个视图可能只有七月，八月，因此它将显示为

Joe User July 19
Joe User August 28

下一个观点，他们可能还有更多

Joe User May 20
Joe User June 98
Joe User July 18
Joy User August 24

我想让输出显示的是这个。

Joe User January 0 0
Joe User February 0 0
Joe User March 0 0
Joe User April 0 0
Joe User May 20 0
Joe User June 98 0 
Joe User July 18 19
Joe User August 24 28
Joe User September 0 0
Joe User October 0 0
Joe User November 0 0
Joe User December 0 0

我的问题是，即使几个月没有价值，我该如何填充呢？ 然后加入我确实拥有的价值观。

更新：

通过下面的示例，我得到非常相似的结果。 这是我尝试运行它而未在WHERE中添加名称时得到的结果。

Joe User April 65 518
Joe User April 87 518
Joe User April 52 518
Joe User April 3  518

重复表值，每月64行。

Answer 1

您需要使用日期表，然后JOIN两个表。 否则，您可以像这样在查询中创建一个：

SELECT m.month, CASE WHEN c.ccount IS NULL THEN 0 ELSE c.ccount END AS view2,
CASE WHEN b.ccount IS NULL THEN 0 ELSE b.ccount END AS view1
FROM
(SELECT 'January' AS month
  UNION ALL
  SELECT 'February'
  UNION ALL
  SELECT 'March'
  UNION ALL
  SELECT 'April'
  UNION ALL
  SELECT 'May'
  UNION ALL
  SELECT 'June'
  UNION ALL
  SELECT 'July'
  UNION ALL
  SELECT 'August'
  UNION ALL
  SELECT 'September'
  UNION ALL
  SELECT 'November'
  UNION ALL
  SELECT 'December') m
LEFT JOIN (SELECT name, month, ccount FROM view1 WHERE name = 'Joe') b ON b.month = m.month
LEFT JOIN (SELECT name, month, ccount FROM view2 WHERE name = 'Joe') c ON c.month = m.month

结果

|     MONTH | VIEW2 | VIEW1 |
-----------------------------
|   January |     0 |     0 |
|  February |     0 |     0 |
|     March |     0 |     0 |
|     April |     0 |     0 |
|       May |    20 |     0 |
|      June |    98 |     0 |
|      July |    18 |    19 |
|    August |    24 |    28 |
| September |     0 |     0 |
|  November |     0 |     0 |
|  December |     0 |     0 |

Answer 2

首先，您必须创建链接服务器或使用OPENROWSET 。 尝试使用OPENROWSET 。

;WITH Months
AS
(
    SELECT 1 m, DATENAME(mm, '20000101') MN
    UNION ALL
    SELECT m+1, DATENAME(mm, DATEADD(m, m, '20000101')) MN
    FROM Months
    WHERE m < 12
)
SELECT
   COALESCE(V1.nmae, V2.name) Name, 
   M.MN [Month], 
   ISNULL(V1.count, 0) Count1, 
   ISNULL(V2.count, 0) Count12 
FROM Months M
    LEFT JOIN ViewOnCurrentServer V1
        ON M.MN = V1.[month]
    LEFT JOIN
         OPENROWSET('SQLNCLI', 'Server=YouServerName;Trusted_Connection=yes;',
                    'SELECT name, month, count
                     FROM DBName.SchemeName.ViewOnAnotherServer') V2
       ON M.MN = V2.[month]
WHERE COALESCE(V1.nmae, V2.name) = 'Joe User'

或者，如果您使用链接服务器，则使用：

;WITH Months
AS
(
    SELECT 1 m, DATENAME(mm, '20000101') MN
    UNION ALL
    SELECT m+1, DATENAME(mm, DATEADD(m, m, '20000101')) MN
    FROM Months
    WHERE m < 12
)
SELECT
   COALESCE(V1.nmae, V2.name) Name, 
   M.MN [Month], 
   ISNULL(V1.count, 0) Count1, 
   ISNULL(V2.count, 0) Count12 
FROM Months M
    LEFT JOIN ViewOnCurrentServer V1
        ON M.MN = V1.[month]
    LEFT JOIN
         ViewOnLinkedServer V2
       ON M.MN = V2.[month]
WHERE COALESCE(V1.nmae, V2.name) = 'Joe User'

Answer 3

SELECT DATENAME(mm, DATEADD(mm, number, '20010101')), 
       ISNULL(v2.[count], 0), ISNULL(v1.[count], 0)
FROM master..spt_values v LEFT JOIN view1 v1 ON DATENAME(mm, DATEADD(mm, v.number, '20010101')) = v1.[month] AND v1.name = 'Joe User'
                          LEFT JOIN view2 v2 ON DATENAME(mm, DATEADD(mm, v.number, '20010101')) = v2.[month] AND v2.name = 'Joe User'
WHERE v.type = 'P' AND v.number < 12

关于SQLFiddle的演示

更新

SELECT *
FROM
(
 SELECT v1.name
 FROM view1 v1
 UNION
 SELECT v2.name
 FROM view2 v2
 ) u CROSS APPLY (
                  SELECT DATENAME(mm, DATEADD(mm, number, '20010101')) AS [month], 
                         ISNULL(v2.[count], 0) AS [count1], ISNULL(v1.[count], 0) AS [count2]                       
                  FROM master..spt_values v 
                    LEFT JOIN view1 v1 ON DATENAME(mm, DATEADD(mm, v.number, '20010101')) = v1.[month] AND v1.name = u.name
                    LEFT JOIN view2 v2 ON DATENAME(mm, DATEADD(mm, v.number, '20010101')) = v2.[month] AND v2.name = u.name
                  WHERE v.type = 'P' AND v.number < 12
                  ) o

SQLFiddle的新演示