需要T-SQL的幫助2005

Question

我有兩個表Employee和EmployeeLog（與除LogCreatedDate同一列）

列是這樣的：

EmployeeID, EmployeeName, LastModifiedBy, ModifiedDate, 
ColumnA, ColumnB, ColumnC bla-bla-bla 

我需要T-SQL這給我輸出如下表所示。

的ResultSet 1：

在每一個Employee表更新我插入EmployeeLog表的新行的當前值。

EmployeeLog表包含每個EmployeeID多個行，所以我需要先前和修改列中的當前值。

因此，我的第一步是我通過LogCreatedDate DESC獲取TOP 2記錄訂單。現在我應該怎麼做才能獲得如表所示的輸出？

的ResultSet 2：

感謝

Answer 1

試試這個：

DECLARE @EmployeeLog TABLE 
(
    EmployeeID int, 
    EmployeeName varchar(50), 
    LastModifiedBy varchar(50), 
    ModifiedDate datetime, 
    ColumnA varchar(50), 
    ColumnB varchar(50), 
    ColumnC varchar(50), 
    LogCreatedDate datetime 
) 

INSERT INTO @EmployeeLog VALUES (1, 'A', 'A', '2012-02-07', 'A', 'B', 'C', '2012-02-07') 
INSERT INTO @EmployeeLog VALUES (1, 'B', 'B', '2012-02-06', 'AA', 'BB', 'CC', '2012-02-06') 

; 
WITH Basics AS 
(
     SELECT *, ROW_NUMBER() OVER (ORDER BY LogCreatedDate DESC) as Entry 
     FROM @EmployeeLog 
),  PivotTable AS 
(
     SELECT EmployeeID, 
       LastModifiedBy, 
       ModifiedDate, 
       'ColumnA' ColumnName, 
       ColumnA ColumnValue, 
       LogCreatedDate, 
       Entry 
     FROM Basics 
     UNION ALL 
     SELECT EmployeeID, 
       LastModifiedBy, 
       ModifiedDate, 
       'ColumnB' ColumnName, 
       ColumnB ColumnValue, 
       LogCreatedDate, 
       Entry 
     FROM Basics 
     UNION ALL 
     SELECT EmployeeID, 
       LastModifiedBy, 
       ModifiedDate, 
       'ColumnC' ColumnName, 
       ColumnC ColumnValue, 
       LogCreatedDate, 
       Entry 
     FROM Basics 
) 
SELECT [Current].LastModifiedBy, [Current].ModifiedDate, 
     Previous.EmployeeID, Previous.ColumnName, 
     Previous.ColumnValue [Previous Value], 
     [Current].ColumnValue [Current Value] 
FROM PivotTable Previous 
JOIN PivotTable [Current] 
    ON Previous.EmployeeID = [Current].EmployeeID AND 
     Previous.ColumnName = [Current].ColumnName AND 
     Previous.Entry = [Current].Entry + 1