After i create table how can i but sql constraints????

Answer 1

You can add constraints to a table after creation with an alter table command. Here's a good starting point: http://www.w3schools.com/sql/sql_constraints.asp

Can you tell us more about the kind of database you have and the type of constraints you want?

Answer 2

thank you alot
well, l use toad for sql server right now
but before i used sql server 2008
for example null., not null., autoincrement, primary key

Answer 3

can i ask you one more question??
who qualify to be a coulmn.??? my be characteristic??