Check Constraints On Date Ranges

Michael Swart has a script to check start versus end dates to ensure there is a valid check constraint for date ranges:

Don’t blindly run scripts that you got from some random guy’s blog. Even if that someone is me. That’s terribly irresponsible.

But this query may be useful if you do want to look for a very specific, simple kind of constraint that may match your business specs. These constraints are just suggestions and may not match your business rules. For example, when I run this query on Adventureworks, I get one “missing” check constraint for HumanResources.Shift(StartTime, EndTime) and when I look at the contents of the Shift table, I get this data:

If you wish non-blindly to run a script you got from that guy’s blog, click through for the script and more details, including a discussion of false positives.

Related Posts

Missing Foreign Keys—A Cultural Problem

Martin Catherall tells a spooky Halloween story: By large databases I’m roughly meaning databases with several hundred tables, and I usually see a lot of these tables with several hundred GB’s of data in them. When I generally ask about the reason for no foreign key, I’m told they add  overhead they give no benefit […]

Read More

Natural Keys?

Steve Jones wonders if we should give up on natural primary key constraints: One of the things I think is important in modeling your particular entity is including a primary key (PK). In my DevOps talk I stress this, as I’d rather most attendees come away thinking a PK is important as their first takeaway […]

Read More

Categories

November 2016
MTWTFSS
« Oct Dec »
 123456
78910111213
14151617181920
21222324252627
282930