Sql select 重复行多列

Question

我想要一个查询，其中 return 每个 ComuterName 一行。该行应包含查询的应用程序及其版本。我当前的查询：

SELECT DISTINCT
  dbo.v_R_System.Name0 [ComputerName],
  dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 [App],
  dbo.v_GS_ADD_REMOVE_PROGRAMS.Version0
FROM
  dbo.v_R_System 
  INNER JOIN dbo.v_GS_ADD_REMOVE_PROGRAMS
    ON dbo.v_R_System.ResourceID = dbo.v_GS_ADD_REMOVE_PROGRAMS.ResourceID
  INNER JOIN dbo.v_R_User
    ON dbo.v_R_System.User_Name0 = dbo.v_R_User.User_Name0
  INNER JOIN dbo.v_GS_COMPUTER_SYSTEM
    ON dbo.v_R_System.Name0 = dbo.v_GS_COMPUTER_SYSTEM.Name0
  INNER JOIN v_GS_PC_BIOS
    ON dbo.v_R_System.ResourceID = dbo.v_GS_PC_BIOS.ResourceID
WHERE
  dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 LIKE '%MS Word%'
  OR dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 LIKE '%Adobe Reader%'
  OR dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 LIKE '%Flash Player%'

返回这个：

╔══════════════╦════════════════════╦═════════╗
║ ComputerName ║        App         ║ Version ║
╠══════════════╬════════════════════╬═════════╣
║ PC1          ║ MS Word            ║ 12      ║
║ PC1          ║ Adobe Reader       ║ 10.0.10 ║
║ PC1          ║ Adobe Flash Player ║ 15.1    ║
║ PC2          ║ MS Word            ║ 15      ║
║ PC2          ║ Adobe Reader       ║ 11.0.07 ║
║ PC2          ║ Adobe Flash Player ║ 16      ║
╚══════════════╩════════════════════╩═════════╝

我想return这种方式的信息：

╔══════════════╦═════════╦═════════╦══════════════╦═════════╦════════════════════╦═════════╗
║ ComputerName ║  App1   ║ App1Ver ║     App2     ║ App2Ver ║        App3        ║ App3Ver ║
╠══════════════╬═════════╬═════════╬══════════════╬═════════╬════════════════════╬═════════╣
║ PC1          ║ MS Word ║      12 ║ Adobe Reader ║ 10.0.10 ║ Adobe Flash Player ║ 15.1    ║
║ PC2          ║ MS Word ║      15 ║ Adobe Reader ║ 11.0.07 ║ Adobe Flash Player ║ 16      ║
╚══════════════╩═════════╩═════════╩══════════════╩═════════╩════════════════════╩═════════╝

此数据库存储在 SQL Server 2008 R2 上。

提前致谢。

Answer 1

你可以使用 case based aggregation，这里的 like 还有一个问题，因为你使用的是 % 通配符，索引不会被使用，并且在大数据集上会变慢

最好使用组 ID 列并在应用程序名称和组之间建立映射 table，并在查询中使用组 ID。

SELECT 
  dbo.v_R_System.Name0 [ComputerName],
  max(case when dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 LIKE '%MS Word%' then 'MS Word' end ) as App1,
  max(case when dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 LIKE '%MS Word%' then dbo.v_GS_ADD_REMOVE_PROGRAMS.Version0 end ) as App1Ver
  max(case when dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 LIKE '%Adobe Reader%' then 'Adobe Reader' end ) as App1,
  max(case when dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 LIKE '%Adobe Reader%' then dbo.v_GS_ADD_REMOVE_PROGRAMS.Version0 end ) as App2Ver
  max(case when dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 LIKE '%Flash Player%' then 'Flash Player' end ) as App1,
  max(case when dbo.v_GS_ADD_REMOVE_PROGRAMS.DisplayName0 LIKE '%Flash Player%' then dbo.v_GS_ADD_REMOVE_PROGRAMS.Version0 end ) as App3Ver

FROM
  dbo.v_R_System 
  INNER JOIN dbo.v_GS_ADD_REMOVE_PROGRAMS
    ON dbo.v_R_System.ResourceID = dbo.v_GS_ADD_REMOVE_PROGRAMS.ResourceID
  INNER JOIN dbo.v_R_User
    ON dbo.v_R_System.User_Name0 = dbo.v_R_User.User_Name0
  INNER JOIN dbo.v_GS_COMPUTER_SYSTEM
    ON dbo.v_R_System.Name0 = dbo.v_GS_COMPUTER_SYSTEM.Name0
  INNER JOIN v_GS_PC_BIOS
    ON dbo.v_R_System.ResourceID = dbo.v_GS_PC_BIOS.ResourceID
group by dbo.v_R_System.Name0

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