mySQL engine is ridicules
Consider a table Populations with fields, Country, City, Area, Population. In SQL Server (and I am sure in Oracle as well) you cannt execute query like
select Country, City, sum(Population) from Populations group by Country order by Country, City
You have to add City field in group by clause…But guess what in mySQL you can </smile>
Moral of story: mySQL based applications is 1+ in defect proneness. O God! save us from such applications.