Insert Data with Foreign Keys - sql

Question

I have two tables connected with a foreign key constraint. Each table has a primary Key (ProductID ,BaseProductID ) that is an autoincrementing identity column.
Every BaseProduct has only 1 Product during the import.
BaseProduct
- BaseProductID
- BaseProductName
Product
- ProductID
- BaseProductID
- ProductName
I try to insert rows into both tables from a different Database that has the same Tables, but different seed Values. I dont want to keep the ids from the source database.
Is there a way to do this in one statement?
EDIT
The Select would be
Select ProductName FROM #SourceProduct
WHERE Not ProductName in (
select ProductName FROM #TargetBaseProduct
)
I tried the solution by Giorgi which is close, but the matching by
tgt.BaseProductID = src.BaseProductID
leads to result where source rows with BaseProductID= 1 are not inserted if the target already has an entry with BaseProductID = 1.
DECLARE #SourceBaseProduct TABLE
(
BaseProductID INT ,
BaseProductName NVARCHAR(MAX)
)
DECLARE #SourceProduct TABLE
(
ProductID INT ,
BaseProductID INT ,
ProductName NVARCHAR(MAX)
)
DECLARE #TargetBaseProduct TABLE
(
BaseProductID INT IDENTITY(1, 1) ,
BaseProductName NVARCHAR(MAX)
)
DECLARE #TargetProduct TABLE
(
ProductID INT IDENTITY(1, 1) ,
BaseProductID INT ,
ProductName NVARCHAR(MAX)
)
INSERT INTO #SourceBaseProduct
VALUES ( 1, 'BaseProduct1' ),
( 2, 'BaseProduct2' ),
( 4, 'BaseProduct3' )
INSERT INTO #SourceProduct
VALUES ( 3, 1, 'Product1' ),
( 9, 2, 'Product2' ),
( 27, 4, 'Product3' )
INSERT INTO #TargetBaseProduct
(
BaseProductName
)
VALUES ( 'Existing Product Base' )
INSERT INTO #TargetProduct(
BaseProductID ,
ProductName)
VALUES ( ##IDENTITY, 'Existing Product' )
MERGE INTO #TargetBaseProduct tgt
USING
( SELECT sbp.BaseProductID ,
sbp.BaseProductName ,
sp.ProductName
FROM #SourceBaseProduct sbp
JOIN #SourceProduct sp ON sp.BaseProductID = sbp.BaseProductID
) AS src
ON tgt.BaseProductID = src.BaseProductID
WHEN NOT MATCHED BY TARGET THEN
INSERT VALUES ( src.BaseProductName )
OUTPUT
Inserted.BaseProductID ,
src.ProductName
INTO #TargetProduct(BaseProductID, ProductName);
SELECT * FROM #TargetBaseProduct
SELECT * FROM #TargetProduct
Output
BaseProductID BaseProductName
1 Existing Product Base
2 BaseProduct2
3 BaseProduct3
ProductID BaseProductID ProductName
1 1 Existing Product
2 2 Product2
3 3 Product3
Expected result
BaseProductID BaseProductName
1 Existing Product Base
2 BaseProduct1
3 BaseProduct2
4 BaseProduct3
ProductID BaseProductID ProductName
1 1 Existing Product
2 2 Product1
3 3 Product2
4 4 Product3
EDIT
using
ON 1 = 0
like Giorgi suggested gave the right result

Answer 1

If I get you right, there is way with MERGE:
DECLARE #SourceBaseProduct TABLE
(
BaseProductID INT ,
BaseProductName NVARCHAR(MAX)
)
DECLARE #SourceProduct TABLE
(
ProductID INT ,
BaseProductID INT ,
ProductName NVARCHAR(MAX)
)
DECLARE #TargetBaseProduct TABLE
(
BaseProductID INT IDENTITY(1, 1) ,
BaseProductName NVARCHAR(MAX)
)
DECLARE #TargetProduct TABLE
(
ProductID INT IDENTITY(1, 1) ,
BaseProductID INT ,
ProductName NVARCHAR(MAX)
)
INSERT INTO #SourceBaseProduct
VALUES ( 1, 'BaseProduct1' ),
( 2, 'BaseProduct2' ),
( 4, 'BaseProduct3' )
INSERT INTO #SourceProduct
VALUES ( 3, 1, 'Product1' ),
( 9, 2, 'Product2' ),
( 27, 4, 'Product3' )
MERGE INTO #TargetBaseProduct tgt
USING
( SELECT sbp.BaseProductID ,
sbp.BaseProductName ,
sp.ProductName
FROM #SourceBaseProduct sbp
JOIN #SourceProduct sp ON sp.BaseProductID = sbp.BaseProductID
) AS src
ON tgt.BaseProductID = src.BaseProductID
WHEN NOT MATCHED BY TARGET THEN
INSERT VALUES ( src.BaseProductName )
OUTPUT
Inserted.BaseProductID ,
src.ProductName
INTO #TargetProduct(BaseProductID, ProductName);
SELECT * FROM #TargetBaseProduct
SELECT * FROM #TargetProduct
Output:
BaseProductID BaseProductName
1 BaseProduct1
2 BaseProduct2
3 BaseProduct3
ProductID BaseProductID ProductName
1 1 Product1
2 2 Product2
3 3 Product3
EDIT: if you want to insert existing rows too, then change
ON tgt.BaseProductID = src.BaseProductID
to
ON 1 = 0