NULL Parameters

Riley Major turns this T-SQL Tuesday into thoughts on procedure parameterization:

But what if the caller wanted the date to be “empty” (i.e. 1900-01-01)? And what if a NULL is passed?

In our environment, we’ve disallowed NULLs from our table fields. We understand that NULL is actually information– it says that the data is unknown– but we believe that for most data fields, there are non-NULL values which just as effectively represent unknown. Typically, 0’s and empty strings (and the “blank” date 1900-01-01) serve that purpose. And those values are more forgiving during coding (they equal things; they don’t make everything else “unknown”), and we accept the risk of paying little attention to which parts of our logic touched “unknown” values.

It’s an interesting look at dealing with optional and default parameters within procedures.

Related Posts

Death Marches Roundup

Jeff Mlakar takes us on a tour of bad project planning: This month we had 15 post submissions about this daunting topic. Two of the posts were from people who had never posted before. To them I say welcome and I hope you enjoyed the experience. I think, in general, you were all brave to […]

Read More

Analysis Of A Failed Project

Eugene Meidinger looks back at a big project which fell apart: So the first issue was that the software was built in-house by another company in the same industry. Imagine, for example, if a large bakery had created an ERP system and another large bakery wanted to move to that system. Sounds great, right? Well, […]

Read More

Categories

March 2017
MTWTFSS
« Feb Apr »
 12345
6789101112
13141516171819
20212223242526
2728293031