Update and ISNULL : ISNULL « Data Convert Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Data Convert Functions » ISNULL 
13. 5. 7. Update and ISNULL
4CREATE TABLE OrderDetails(
5> orderID       int NOT NULL,
6> PartID   int NOT NULL,
7> Quantity int NOT NULL);
8> GO
1>
2>
3>
4INSERT INTO OrderDetails VALUES(100011112)
5INSERT INTO OrderDetails VALUES(100014210)
6INSERT INTO OrderDetails VALUES(10001725)
7INSERT INTO OrderDetails VALUES(10002149)
8INSERT INTO OrderDetails VALUES(100025140)
9INSERT INTO OrderDetails VALUES(100034110)
10INSERT INTO OrderDetails VALUES(100036135)
11INSERT INTO OrderDetails VALUES(100036515)
12>
13> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2CREATE PROC dbo.usp_OrderDetailsUpdate
3>   @orderid    int,
4>   @partid     int,
5>   @neworderid int = NULL,
6>   @newpartid  int = NULL,
7>   @quantity   int = NULL
8> AS
9UPDATE OrderDetails
10>   SET orderid = ISNULL(@neworderid, orderid),
11>       partid = ISNULL(@newpartid, partid),
12>       quantity = ISNULL(@quantity, quantity)
13WHERE
14>     orderid = @orderid
15>   AND
16>     partid = @partid
17> GO
1>
2>
3>
4>
5> drop table OrderDetails;
6> GO
1>
13. 5. ISNULL
13. 5. 1. The syntax of the ISNULL function
13. 5. 2. Replacing null values with zero values with ISNULL
13. 5. 3. SELECT statement using the ISNULL function
13. 5. 4. System function ISNULL allows a display of the specified value as substitution for NULL.
13. 5. 5. Combine CAST and ISNULL
13. 5. 6. Performing Flexible Searches Using ISNULL
13. 5. 7. Update and ISNULL
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