sql server - Turn off constraints temporarily (MS SQL)

Question

I'm looking for a way to temporarily turn off all DB's constraints (eg table relationships).

I need to copy (using INSERTs) one DB's tables to another DB. I know I can achieve that by executing commands in proper order (to not break relationships).

But it would be easier if I could turn off checking constraints temporarily and turn it back on after the operation's finish.

Is this possible?

Answer 1

-- Disable the constraints on a table called tableName:
ALTER TABLE tableName NOCHECK CONSTRAINT ALL

-- Re-enable the constraints on a table called tableName:
ALTER TABLE tableName WITH CHECK CHECK CONSTRAINT ALL
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-- Disable constraints for all tables in the database:
EXEC sp_msforeachtable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'

-- Re-enable constraints for all tables in the database:
EXEC sp_msforeachtable 'ALTER TABLE ? WITH CHECK CHECK CONSTRAINT ALL'
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