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I'd like to see the ability to attach custom error messages to CONSTRAINT objects, specifically CHECK constrints. Either directly or via a custom error number in sysmessages.
I've seen developers have to create triggers. I think that's not a good reason to implementing it.
I'm using SQL SERVER 2008.
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Therefore, when a system error occurs, SQL Server will log a system error and may take actions to fix the error. Custom errors, on the other hand, are generated by T-SQL custom codes based on your code or business logic. To add a custom error message to sys. messages, the stored procedure sp_addmessage is used.
Modifying Properties of a Constraint Use the following syntax for the ALTER TABLE command to modify the properties of a constraint: ALTER TABLE <table_name> { ALTER | MODIFY } { CONSTRAINT <name> | PRIMARY KEY | { UNIQUE | FOREIGN KEY } (<column_name>, [ ... ] ) }
You have to drop it and recreate it, but you don't have to incur the cost of revalidating the data if you don't want to. alter table t drop constraint ck ; alter table t add constraint ck check (n < 0) enable novalidate; Show activity on this post. constraints are always in place.
The syntax for creating a check constraint in an ALTER TABLE statement in SQL Server (Transact-SQL) is: ALTER TABLE table_name ADD CONSTRAINT constraint_name CHECK (column_name condition); table_name. The name of the table that you wish to modify by adding a check constraint.
You could name your constraint with a user message.
For Example:
ADD CONSTRAINT
[Foo cannot be greater than Bar. Please be sure to check your foos and bars next time.]
CHECK (foo <= Bar)
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