How to retrieve SCOPE_IDENTITY of all inserts done in INSERT INTO [table] SELECT [col1, ...] [duplicate] - sql

Question

This question already has answers here:
SQL Server - Return value after INSERT
(14 answers)
Closed 7 months ago.
Suppose I have a temp table with some cols one of which I have dedicated to identity column of the inserted Invoice and the others for inserting Invoice data itself. Like the following table :
CREATE TABLE #InvoiceItems
(
RowNumber INT, -- Used for inserting new invoice
SaleID INT, -- Used for inserting new invoice
BuyerID INT, -- Used for inserting new invoice
InvoiceID INT -- Intended for PK of the invoice added after inserting it
);
I use something like the following for inserting data into Invoice table
INSERT INTO [Invoice]
SELECT [col1, ...]
FROM #InvoiceItems
How can I achieve to fill the InvoiceID column while inserting table data into Invoice table using temp table? I know about SCOPE_IDENTITY() function but it returns the last inserted PK only which does not really suit my need.
I could also use a while to do this one by one but since the number of data I'm planning to insert is immense, I feel like it's not going to be the most optimized option.
Thanks for the answers in advance.

Answer 1

To grab multiple IDENTITY values from INSERT INTO SELECT FROM OUTPUT clause could be used:
-- temp table
CREATE TABLE #temp(col VARCHAR(100));
INSERT INTO #temp(col) VALUES ('A'), ('B'), ('C');
--target table
CREATE TABLE tab(
id INT IDENTITY,
col VARCHAR(100)
);
Main insert:
INSERT INTO tab(col)
OUTPUT inserted.id, inserted.col
SELECT col
FROM #temp;
The output could be also Inserted into another table using OUTPUT INTO:
CREATE TABLE #temp_identity(id INT);
INSERT INTO tab(col)
OUTPUT inserted.id
INTO #temp_identity
SELECT col
FROM #temp;
SELECT * FROM #temp_identity;
db<>fiddle demo

Answer 2

CREATE TABLE #InvoiceItems(
RowNumber INT,
SaleID INT,
BuyerID INT,
InvoiceID INT
);
INSERT INTO #InvoiceItems (RowNumber, SaleID, BuyerID) values (1, 55, 77)
INSERT INTO #InvoiceItems (RowNumber, SaleID, BuyerID) values (1, 56, 78)
INSERT INTO #InvoiceItems (RowNumber, SaleID, BuyerID) values (1, 57, 79)
INSERT INTO #InvoiceItems (RowNumber, SaleID, BuyerID) values (1, 58, 80)
INSERT INTO #InvoiceItems (RowNumber, SaleID, BuyerID) values (1, 59, 81)
DECLARE #Inserted table( RowNumber int,
SaleID INT,
BuyerID INT,
InvoiceID INT);
INSERT INTO dbo.[Invoice] (RowNumber, SaleID, BuyerID)
OUTPUT INSERTED.RowNumber, INSERTED.SaleID, INSERTED.BuyerID, INSERTED.InvoiceID
INTO #Inserted
SELECT RowNumber, SaleID, BuyerID
FROM #InvoiceItems
UPDATE ii
SET InvoiceID = ins.InvoiceID
FROM #InvoiceItems ii
JOIN #Inserted ins on ins.BuyerID = ii.BuyerID and ins.RowNumber = ii.RowNumber and ins.SaleID = ii.SaleID
SELECT * FROM #InvoiceItems