How to create validation in SQL server

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Hi All,
I need to Validate a column in my table with the a particular field should be mandatory ,by giving a error message How can I achieve this in SQL Server.

What I have tried:

I need to Validate a column in my table with the a particular field should be mandatory ,by giving a error message How can I achieve this in SQL Server.

Posted 8-Sep-16 19:36pm

Member 12605293

Updated 8-Sep-16 20:08pm

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Karthik_Mahalingam 9-Sep-16 1:57am

are you using stored procedure?
win or web?

Member 12605293 9-Sep-16 2:00am

Hi Karthik,
Thanks for your Quick reply,This is my Query
declare @error int
declare @error_message nvarchar (200)
declare @ItemCode nvarchar (200)
SELECT * FROM IGN1
WHERE [ItemCode] Like 'AP%' OR [ItemCode] Like 'ZP%'
IF ISNULL ([@ItemCode],0)!=0
BEGIN
SET @error=-1
SET @error_message= 'This Field is Mandatory'
END

Karthik_Mahalingam 9-Sep-16 2:05am

@itemcode is not assigned
check my solution

2 solutions

Solution 1

See here: Using Check Constraints to Validate Data in SQL Server[^]
But generally, I prefer to validate in application code and only pass valid data to SQL. That way, the error can be more specifically targeted for the user and that can only help improve input.

Posted 8-Sep-16 19:57pm

OriginalGriff

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Karthik_Mahalingam · Accepted Answer · 2016-09-08T20:08:00

based on the code in comments

SQL

declare @error int
declare @error_message nvarchar (200)
declare @ItemCode nvarchar (200)

if not exists( SELECT * FROM IGN1 WHERE [ItemCode] Like 'AP%' OR [ItemCode] Like 'ZP%' ) 
BEGIN
SET @error=-1
SET @error_message= 'This Field is Mandatory'
select @error_message
END

EXISTS (Transact-SQL)[^]