generally agree

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 25 Jul 2011 12:29:30 +0200

I do generally agree with the “Conclusion” mentioned at the end of this entry. It will be a topic of different post to discuss and convince people to normalize data if you see too many NULLable columns in the database.

@Stephane This is how nulls are treated by design. For e.g. you may claim that the count of * and count of city should be equal which is not in case of NULL.

mysql> select count(), count(city) from t; +———-+————-+ | count() | count(city) | +———-+————-+ | 1 | 0 | +———-+————-+ 1 row in set (0.00 sec)

generally agree on FromDual GmbH

generally agree