Does SQL Server allow constraint violations in a transaction as long as it's not committed yet?

Question

Does SQL Server allow constraint violations (i.e. deferred constraints) in a transaction as long as the transaction has not been committed yet?

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Answer 1

You can disable your constraints while running your transaction, and then reenabling them when you are done.

ALTER TABLE mytable NOCHECK CONSTRAINT myconstraint

--... RUN TRANSACTION

ALTER TABLE mytable WITH CHECK CHECK CONTRAINT ALL

Warning: This will affect all connections.