Deletes Ignore Check Constraints

James Anderson shows that delete statements will ignore check constraints:

I know it sounds a bit odd but DELETE statements really do ignore table constraints. Running the code below in a test database will setup a test to prove this.

James gives a couple pieces of advice on how to implement this scenario if you find yourself needing to do something like this.

Related Posts

Changing Constraints in Near-Zero Downtime Situations

I have part six of my interminable series on near-zero downtime deployments: The locking story is not the same as with the primary and unique key constraints. First, there’s one extra piece: the transition will block access to dbo.LookupTable as well as the table we create the constraint on. That’s to keep us from deleting rows in […]

Read More

Implicit Parent Reference On Foreign Keys

Deborah Melkin shows us an interesting way of creating foreign keys: No matter how long you work with something, you can always find something that you never knew before. I found one about foreign keys this week. I was reviewing SQL scripts for coworkers and I noticed that the foreign keys were written without referencing […]

Read More

Categories

May 2016
MTWTFSS
« Apr Jun »
 1
2345678
9101112131415
16171819202122
23242526272829
3031