[英]How To Update Multiple Conditions Using MERGE Statements
我必須比較源數據和目標數據並相應地合並它們。 但是我有多個條件。 以下是我的第一組源數據
Source-Table1
ID StartDate EndDate Designation
1 2018-01-01 2199-12-31 Associate Engineer
2 2018-02-01 2199-12-31 Software Engineer
Target-Table2
ID StartDate EndDate Designation
1 2018-01-01 2199-12-31 Associate Engineer
2 2018-02-01 2199-12-31 Software Engineer
Create table Table1(
Id int,
StartDate datetime,
EndDate Datetime,
Designation nvarchar(100)
)
Create table Table2(
Id int,
StartDate datetime,
EndDate Datetime,
Designation nvarchar(100)
)
--insert values
insert into Table1 values(1,'2018-01-01','2199-12-31','Associate Engineer')
insert into Table1 values(2,'2018-02-01','2199-12-31','Software Engineer')
--Use Merge to Update/Insert values
MERGE Table2 t
USING Table1 s
on t.id=s.id
WHEN MATCHED THEN
update SET
t.id=s.id,
t.StartDate=s.StartDate,
t.EndDate=s.EndDate,
t.Designation=s.Designation
WHEN NOT MATCHED BY TARGET THEN
INSERT(
ID,
StartDate,
ENDDate,
Designation
)
VALUES
(s.ID,
s.StartDate,
s.EndDate,
s.Designation)
;
現在,如果我必須更新多個條件,此代碼將不起作用。 例如,如果“我的源數據”具有以下值,則每個ID不能具有重疊值。 當每個ID都有新記錄時,我必須檢查StartDate,如果start Date是<enddate那么,將我的舊endDate更新到上個月的最后一天,並插入新記錄,否則ID和StartDate匹配,然后更新所有記錄。 如果ID和StartDate不匹配,則插入。
Source-Table1
ID StartDate EndDate Designation
1 2018-01-01 2199-12-31 Associate Engineer
1 2018-02-01 2199-12-31 Software Engineer
2 2018-02-01 2199-12-31 Software Engineer
2 2018-03-01 2199-12-31 Senior Software Engineer
現在我要我的目標表
ID StartDate EndDate Designation
1 2018-01-01 2018-01-31 Associate Engineer
1 2018-02-01 2199-12-31 Software Engineer
2 2018-02-01 2018-02-28 Software Engineer
2 2018-03-01 2199-12-31 Senior Software Engineer
我無法使用MERGE語句執行此操作。你們中的任何人都可以幫助我獲得此結果嗎?
如果我正確理解了您的問題,那么您希望將源表與目標表合並。 但是,如果用戶的角色已更改,例如將助理工程師更改為軟件工程師,則您希望將原始記錄的EndDate更新為新記錄開始日期之前的該月的最后一天。 如果我的理解是正確的,那么您應該能夠實現以下目標:
;MERGE [Table2] [T]
USING (
SELECT [T1].[Id]
,[T1].[StartDate]
,CAST(LEAD(EOMONTH(DATEADD(DAY, -1, [T1].[StartDate])), 1, [T1].[EndDate]) OVER (PARTITION BY [T1].[Id] ORDER BY [T1].[StartDate]) AS DATETIME) AS [EndDate]
,[T1].[Designation]
FROM [dbo].[Table1] [T1]
) [S]
ON ([T].[Id] = [S].[Id] AND [T].[StartDate] = [S].[StartDate])
WHEN MATCHED THEN
UPDATE
SET [T].[EndDate] = [S].[EndDate],
[T].[Designation] = [S].[Designation]
WHEN NOT MATCHED BY TARGET THEN
INSERT
(
[Id],
[StartDate],
[EndDate],
[Designation]
)
VALUES
(
[S].ID,
[S].StartDate,
[S].EndDate,
[S].Designation
);
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