TSQL'查找'功能 - 困惑

我一直在研究一个'简单'问题整天，它让我发疯。我确信我错过了一些明显的东西;然而，没有多少搜索帮助我。TSQL'查找'功能 - 困惑

我有1行数据表，如; （Table_1）

   Person_1   Person_2   Person_3 
PersonID  ABC    DEF    GHI

但是我需要用另一个表中的值替换引用，但与ID列匹配，例如; （表2）

PersonID  Work_Done 
    LMN   298 
    GHI   187 
    ABC   872 
    XYZ   468 
    DEF   512

因此返回;

   Person_1   Person_2   Person_3 
Work_Done  872    512    187

我正在使用Microsoft SQL Server企业版V8.00.2039，我无法控制我的源表。

任何帮助（即使只是想什么谷歌）将非常感激。

用于生成示例表的SQL;

-- Table_1 
SELECT 
'ABC' AS Person_1, 
'DEF' AS Person_2, 
'GHI' AS Person_3 
; 
-- Table_2 
SELECT 'LMN' AS Person_ID, 298 AS Work_Done 
UNION ALL 
SELECT 'GHI' AS Person_ID, 187 AS Work_Done 
UNION ALL 
SELECT 'ABC' AS Person_ID, 872 AS Work_Done 
UNION ALL 
SELECT 'XYZ' AS Person_ID, 468 AS Work_Done 
UNION ALL 
SELECT 'DEF' AS Person_ID, 512 AS Work_Done 
; 
--Returning 
SELECT 
'872' AS Person_1, 
'512' AS Person_2, 
'187' AS Person_3;

来源

2013-12-11 dan_miles86

（1）TABLE_1似乎混淆行/列。（2）最后给出的sql不会创建表。我可以告诉你，你正在寻找一个加入，但恐怕这可能没有足够的帮助。看看一个SQL教程，例如。 http://www.w3schools.com/sql/ – thebjorn

既然你不能改变设计，这里的检索你想要的代码：

SELECT Person_1 = a.Work_Done 
, Person_2 = b.Work_Done 
, Person_3 = c.Work_Done 
FROM Table1 t 
    JOIN Table2 a ON t.Person_1 = a.Person_ID 
    JOIN Table2 b ON t.Person_2 = b.Person_ID 
    JOIN Table2 c ON t.Person_3 = c.Person_ID

多加入到同一个表的别名（表2）

来源

2013-12-11 20:30:53

好又简单，虽然实际的数据表有9列，所以我需要9个连接。 –

SELECT * 
FROM 
(
    SELECT unpvt.Person_Type, b.Work_Done 
    FROM Table_1 a 
    UNPIVOT (Person_ID FOR Person_Type IN (a.[Person_1], a.[Person_2], a.[Person_3])) unpvt 
    JOIN Table_2 b ON unpvt.Person_ID = b.Person_ID 
) c 
PIVOT (MAX(c.Work_Done) FOR c.Person_Type IN ([Person_1], [Person_2], [Person_3])) pvt

SQL Fiddle

来源

2013-12-11 20:34:44

DO PIVOT
http://technet.microsoft.com/en-us/library/ms177410(v=sql.105).aspx

请注意，你需要的，如果你想有不同的组合

使用嵌入式SQL和EXEC @sql请注意，在PERSON_ID IN（[ABC]，[DEF]，[LMN] [GHI]，[XYZ]）
[ABC]是表的需要，当你做你@sql要小心'撇号科拉姆

SELECT 
    * 
FROM(

SELECT 'LMN' AS Person_ID, 298 AS Work_Done 
UNION ALL 
SELECT 'GHI' AS Person_ID, 187 AS Work_Done 
UNION ALL 
SELECT 'ABC' AS Person_ID, 872 AS Work_Done 
UNION ALL 
SELECT 'XYZ' AS Person_ID, 468 AS Work_Done 
UNION ALL 
SELECT 'DEF' AS Person_ID, 512 AS Work_Done 


) as datasourcetable 
PIVOT 
(
SUM(Work_Done) 
FOR Person_ID IN ([ABC], [DEF],[LMN],[GHI],[XYZ]) 

) AS PivotTable;

来源

2013-12-11 20:50:42

TSQL'查找'功能 - 困惑

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