[英]Add an incremental number in a field in INSERT INTO SELECT query in SQL Server
我有一個INSERT INTO SELECT
查詢。 在SELECT
語句中,我有一個子查詢,我想在其中添加一個字段中的增量數。 如果我的SELECT
查詢並且只返回一條記錄,則此查詢將正常工作,但如果它返回多行,則會在增量字段中為所有這些行插入相同的數字。 有沒有辦法限制它每次添加一個增量數?
INSERT INTO PM_Ingrediants_Arrangements_Temp
(AdminID,ArrangementID,IngrediantID,Sequence)
(SELECT
@AdminID, @ArrangementID, PM_Ingrediants.ID,
(SELECT
MAX(ISNULL(sequence,0)) + 1
FROM
PM_Ingrediants_Arrangements_Temp
WHERE
ArrangementID=@ArrangementID)
FROM
PM_Ingrediants
WHERE
PM_Ingrediants.ID IN (SELECT
ID
FROM
GetIDsTableFromIDsList(@IngrediantsIDs))
)
您可以使用row_number()
函數。
INSERT INTO PM_Ingrediants_Arrangements_Temp(AdminID, ArrangementID, IngrediantID, Sequence)
SELECT @AdminID, @ArrangementID, PM_Ingrediants.ID,
row_number() over (order by (select NULL))
FROM PM_Ingrediants
WHERE PM_Ingrediants.ID IN (SELECT ID FROM GetIDsTableFromIDsList(@IngrediantsIDs)
)
如果你想從表中已有的最大值開始,那么:
INSERT INTO PM_Ingrediants_Arrangements_Temp(AdminID, ArrangementID, IngrediantID, Sequence)
SELECT @AdminID, @ArrangementID, PM_Ingrediants.ID,
coalesce(const.maxs, 0) + row_number() over (order by (select NULL))
FROM PM_Ingrediants cross join
(select max(sequence) as maxs from PM_Ingrediants_Arrangement_Temp) const
WHERE PM_Ingrediants.ID IN (SELECT ID FROM GetIDsTableFromIDsList(@IngrediantsIDs)
)
最后,您可以將sequence
列設置為自動遞增標識列。 這樣就無需每次都增加它:
create table PM_Ingrediants_Arrangement_Temp ( . . .
sequence int identity(1, 1) -- and might consider making this a primary key too
. . .
)
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