Says it all here:
Some nice comments about PostgreSQL. The comments about MySQL are, however, a little unfair as some others mention. Out of the box MySQL can be a bit moronic but it doesn’t take much to get it to behave reasonably. I’ve covered this before at 2011’s UKOUG in my ‘When Dolphins Attack’ presentation and others have made similar observations. Still, its a nice post and well worth a read.