Em 14/8/2011 23:43, W O escreveu: > Hello everybody > > I had unique key restrictions on the column "Name" of tables like: > Countries, States, Banks, etc. > > So, I can avoid duplicates. > > What do you think, is it correct to use unique keys for that job? > > Greetings. > > Walter. >
It depends on the business rules... I don't think that a unique constraint on the Field Name of a table of people is ok. We al lknow that there is more than one John Smith in the world. see you !
