MySQL has a lot of nice additions to the SQL-92 standard that make life easier for developers. The drawback to these shortcuts is that many developers don't learn how to cope in other database environments, like PostgreSQL. Take INSERT IGNORE for example: PostgreSQL does not have support for this syntax. A resourceful developer can do a quick google search to learn an alternative, but many of the solutions at the top of google will show the wrong way to solve this problem.
March, 5 2009