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check constraint sql server


check constraint sql server

By : Rahu nandan
Date : October 14 2020, 02:21 PM
help you fix your problem I find the solution thanks to Mr: denis.
you have first to create a function like this:
code :
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

CREATE FUNCTION DBO.ESAMI_CHECK
(
    -- Add the parameters for the function here
    @IdStudente INT
)
RETURNS INT

AS
BEGIN
    RETURN (
        SELECT COUNT(*) 
        FROM ESAMI WHERE IdStudente=@IdStudente
        GROUP BY IdStudente 
    )   
END
GO
ALTER TABLE [dbo].[ESAMI]
ADD CONSTRAINT CHK_ColumnD_ESEMI
CHECK (DBO.ESAMI_CHECK(IdStudente) <= 2)


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SQL Server check constraint

SQL Server check constraint


By : user2837389
Date : March 29 2020, 07:55 AM
I wish this help you The second constraint turns on (activates) the check constraint. It is just template code from SSMS
It is possible to generate the create check constraints snippet with or without activating it (e.g. nocheck) - so that is itself one of 2 snippets. Because you opted for the constraints to end up activated, SSMS follows with the activation, not really caring if it was activated already or not. It doesn't really hurt and is just something SSMS does
SQL Server : check constraint to check customers are over 18

SQL Server : check constraint to check customers are over 18


By : Jeff Coy
Date : March 29 2020, 07:55 AM
I hope this helps . This condition is invalid in a check constraint because it is non-deterministic. If the clock is turned back suddenly rows that were valid could now become invalid. The constraint would retroactively be invalidated.
You should probably move this check to the application.
How to add check constraint in SQL Server?

How to add check constraint in SQL Server?


By : m sqr
Date : March 29 2020, 07:55 AM
This might help you You can't have existing rows in the table that violate the constraint. You can solve this by either
code :
DELETE FROM dbo.MyTable WHERE BirthDate < '1980-01-01'
UPDATE dbo.MyTable SET BirthDate = '1980-01-01'/*Your new date*/ 
WHERE BirthDate < '1980-01-01'
How to know if a Constraint is actually with CHECK in SQL Server

How to know if a Constraint is actually with CHECK in SQL Server


By : smythie89
Date : March 29 2020, 07:55 AM
Any of those help ALTER TABLE ... CHECK CONSTRAINT ... doesn't validate existing data - so it is still not trusted.
You need to do ALTER TABLE ... WITH CHECK CHECK CONSTRAINT ... (yes, CHECK twice) so that it both validates existing data and enforces it for new insertions
Add Check constraints in SQL Server: ADD CONSTRAINT vs ADD CHECK

Add Check constraints in SQL Server: ADD CONSTRAINT vs ADD CHECK


By : bill23
Date : March 29 2020, 07:55 AM
To fix the issue you can do It is possible, but a very bad habit to add constraints without a name:
code :
CREATE TABLE tbl(SomeColumn VARCHAR(10) DEFAULT('test'))
CREATE TABLE tbl(SomeColumn VARCHAR(10) CONSTRAINT DF_YourTable_SomeColumm DEFAULT('test'))
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