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An example of an INSERT statement in which the OUTPUT clause can be very handy is when you issue a multirow INSERT into a table with an identity column and want to capture the new identity values. With single-row INSERTs, this isn t a problem: The SCOPE_IDENTITY function provides the last identity value generated by your session in the current scope. But for a multirow INSERT statement, how do you nd the new identity values You use the OUTPUT clause to return the new identity values or insert them into a table. To demonstrate this technique, rst run the following code, which creates the CustomersDim table:
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USE tempdb; IF OBJECT_ID('dbo.CustomersDim') IS NOT NULL DROP TABLE dbo.CustomersDim; CREATE TABLE dbo.CustomersDim ( keycol INT NOT NULL IDENTITY PRIMARY KEY, custid INT NOT NULL, companyname NVARCHAR(40) NOT NULL, /* ... other columns ... */ );
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Imagine that this table represents a customer dimension in your data warehouse. You now need to insert into the CustomersDim table the UK customers from the Sales.Customers table in the InsideTSQL2008 database. Notice that the target has an identity column called keycol that contains surrogate keys for customers. I won t get into the reasoning behind the common use of surrogate keys in dimension tables in data warehouses (as opposed to relying on natural keys only); that s not the focus of my discussion here. I just want to demonstrate a technique that uses the OUTPUT clause. Suppose that after each insert you need to do some processing of the newly added customers and identify which surrogate key was assigned to each customer. The following code declares a table variable (@NewCusts), issues an INSERT statement inserting UK customers into CustomersDim and directing the new custid and keycol values into @NewCusts, and queries the table variable:
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DECLARE @NewCusts TABLE ( custid INT NOT NULL PRIMARY KEY, keycol INT NOT NULL UNIQUE );
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INSERT INTO dbo.CustomersDim(custid, companyname) OUTPUT inserted.custid, inserted.keycol INTO @NewCusts -- OUTPUT inserted.custid, inserted.keycol SELECT custid, companyname FROM InsideTSQL2008.Sales.Customers WHERE country = N'UK'; SELECT custid, keycol FROM @NewCusts;
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This code generates the following output, where you can see the new identity values in the column keycol:
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custid ----------4 11 16 19 38 53 72 keycol ----------1 2 3 4 5 6 7
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Notice the commented second OUTPUT clause in the code, which isn t followed by an INTO clause. Uncomment it if you also want to send the output to the caller; you will have two OUTPUT clauses in the INSERT statement.
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DELETE with OUTPUT
In 9, I described a technique to delete large volumes of data from an existing table in batches to avoid log explosion and lock escalation problems. Here I will show how you can use the new OUTPUT clause to archive the data that you purge. To demonstrate the technique, rst run the following code, which creates the LargeOrders table and populates it with more than two million orders placed in years 2004 through 2008:
USE tempdb; IF OBJECT_ID('dbo.LargeOrders') IS NOT NULL DROP TABLE dbo.LargeOrders; CREATE TABLE dbo.LargeOrders ( orderid INT NOT NULL CONSTRAINT PK_LargeOrders PRIMARY KEY NONCLUSTERED, custid INT NOT NULL, empid INT NOT NULL, orderdate DATE NOT NULL, filler CHAR(200) NOT NULL DEFAULT ('a') ) GO CREATE UNIQUE CLUSTERED INDEX idx_od_oid ON dbo.LargeOrders(orderdate, orderid); GO
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INSERT INTO dbo.LargeOrders WITH (TABLOCK)(orderid, custid, empid, orderdate) SELECT ROW_NUMBER() OVER(ORDER BY (SELECT 0)), custid, empid, DATEADD(day, n-1, '20040101') FROM InsideTSQL2008.Sales.Customers AS C CROSS JOIN InsideTSQL2008.HR.Employees AS E CROSS JOIN dbo.Nums WHERE n <= DATEDIFF(day, '20000401', '20081231') + 1;
Warning It should take the code a few minutes to run, and it will require about a gigabyte
of space in your tempdb database. Also, the code refers to the Nums auxiliary table, which I covered in 6.
Remember, you use the following technique to delete all rows with an orderdate older than 2006 in batches of 5,000 rows (but don t run it yet):
WHILE 1 = 1 BEGIN DELETE TOP (5000) FROM dbo.LargeOrders WHERE orderdate < '20060101'; IF @@rowcount < 5000 BREAK; END
Suppose you wanted to enhance the solution that purges historic data in batches by also archiving the data that you purge. Run the following code to create the OrdersArchive table, where you will store the archived orders:
IF OBJECT_ID('dbo.Archive') IS NOT NULL DROP TABLE dbo.Archive; CREATE TABLE dbo.Archive ( orderid INT NOT NULL PRIMARY KEY NONCLUSTERED, custid INT NOT NULL, empid INT NOT NULL, orderdate DATE NOT NULL, filler CHAR(200) NOT NULL ); GO CREATE UNIQUE CLUSTERED INDEX idx_od_oid ON dbo.Archive(orderdate, orderid);
Using the OUTPUT clause, you can direct the deleted rows from each batch into the OrdersArchive table. Here is the enhanced solution, which purges orders with an orderdate before 2006 in batches and also archives them:
WHILE 1 = 1 BEGIN DELETE TOP(5000) FROM dbo.LargeOrders OUTPUT deleted.orderid, deleted.custid, deleted.empid, deleted.orderdate, deleted.filler INTO dbo.Archive(orderid, custid, empid, orderdate, filler) WHERE orderdate < '20060101'; IF @@rowcount < 5000 BREAK; END
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