Select from one table and insert to another two table

Question

I am a beginner at SQL and I don\'t know much about Transact-SQL.

I realize this is a newbie question, but I\'m looking for a simple solution.

I have a table

Answer 1

I think you want something like the below. The temporary table @Output will capture the inserted identities for the first table, then these can be used when inserting to the second table.

DECLARE @Output TABLE 
(       FirstTableID    INT NOT NULL PRIMARY KEY, 
        WarehouseCode   VARCHAR(3), 
        CustomerCode    VARCHAR(4)
)
INSERT INTO FirstTable (WarehouseCode, CustomerCode)
OUTPUT inserted.FirstTblID, inserted.WarehouseCode, inserted.CustomerCode INTO @Output
SELECT  DISTINCT LEFT(LocationCode, 3) [WarehouseCode], CustomerCode
FROM    [PrimaryTable]

INSERT INTO SecondTable (ItemCode, LocationCode, CustomerCode, FirstTblID)
SELECT  p.ItemCode,
        p.LocationCode,
        p.CustomerCode, 
        o.FirstTableID
FROM    [PrimaryTable] p
        INNER JOIN @Output o
            ON LEFT(LocationCode, 3) = WarehouseCode
            AND p.CustomerCode = o.CustomerCode