Can I Temporarily Disable and Re-enable Constraints in MS SQL?

Temporarily disable constraints for data manipulation in MS SQL

When working with SQL databases, enforcing constraints is critical to maintaining data integrity. However, in some cases, temporarily disabling constraints can simplify data manipulation tasks.

Question:

Is it possible to temporarily close and reopen all database constraints (e.g. table relationships) in MS SQL?

Answer:

Yes, constraints can be disabled and re-enabled in MS SQL using:

Disable constraints on specific tables:

To disable a constraint on a specific table named "tableName":

<code class="language-sql">ALTER TABLE tableName NOCHECK CONSTRAINT ALL</code>

Re-enable constraints on specific tables:

To re-enable a constraint on the same table:

<code class="language-sql">ALTER TABLE tableName WITH CHECK CHECK CONSTRAINT ALL</code>

Disable constraints on all tables:

To disable constraints on all tables in the database, execute the following stored procedure:

<code class="language-sql">EXEC sp_msforeachtable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'</code>

Re-enable constraints on all tables:

To re-enable constraints on all tables in the database, execute the following stored procedure:

<code class="language-sql">EXEC sp_msforeachtable 'ALTER TABLE ? WITH CHECK CHECK CONSTRAINT ALL'</code>

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