Question

我有这个数据库表。

dbo.tblSites

| Site_Code | Site Name |
     A         Aaaaaa
     B         Bbbbbb
     C         Cccccc
     D         Dddddd

这是另一张表

 dbo.Server
| Site_Code | ServerName | Status |         Timestamp        | 
      A          QQQ        OK       01/02/2016 10:00:00.000
      A          QQQ        OK       01/02/2016 10:00:03.000
      A          QQQ      Critical   01/02/2016 10:00:05.000
      A          WWW      Critical   01/02/2016 10:00:02.000
      A          WWW      Critical   01/02/2016 10:00:05.000
      A          WWW        OK       01/02/2016 10:00:06.000
      A          EEE        OK       01/02/2016 10:00:05.000
      A          EEE        OK       01/02/2016 10:00:07.000
      A          EEE      Critical   01/02/2016 10:00:08.000
      B          QQQ        OK       01/02/2016 10:00:00.000
      B          QQQ        OK       01/02/2016 10:00:03.000
      B          QQQ      Critical   01/02/2016 10:00:05.000
      B          WWW      Critical   01/02/2016 10:00:02.000
      B          WWW      Critical   01/02/2016 10:00:05.000
      B          WWW        OK       01/02/2016 10:00:06.000
      B          EEE        OK       01/02/2016 10:00:05.000
      B          EEE        OK       01/02/2016 10:00:07.000
      B          EEE        OK       01/02/2016 10:00:08.000

我需要获取所有站点代码并将其作为列我还需要在列下面列出服务器的“最新”状态

| ServerName | SiteCode-A | SiteCode-B |   SiteCode-C   |   SiteCode-D   |
     QQQ        Critical     Critical     No Data Found    No Data Found
     WWW          OK            OK        No Data Found    No Data Found
     EEE        Critical        OK        No Data Found    No Data Found

Answer 1

您可以使用dynamic crosstab执行此操作：

SQL Fiddle

DECLARE @sql NVARCHAR(MAX) = ''

SELECT @sql = 
'SELECT
    ServerName' + CHAR(10)

SELECT @sql = @sql +
'   , ISNULL(MAX(CASE WHEN Site_Code = ''' + Site_Code + '''THEN Status END), ''No Data Found'') AS '  + QUOTENAME('SiteCode-'+Site_Code) + CHAR(10)
FROM tblSites
ORDER BY Site_Code

SELECT @sql = @sql +
'FROM (
    SELECT *, rn = ROW_NUMBER() OVER(PARTITION BY Site_Code, ServerName ORDER BY Timestamp DESC)
    FROM [Server]
) t
WHERE rn = 1
GROUP BY ServerName
ORDER BY ServerName'

PRINT @sql
EXEC sp_executesql @sql

将行转换为列并在SQL Server中组合两个数据库表

1 个答案: