primary key and uniqueness
Is it posible to create a table like this
CREATE TABLE usuario (
U_id SERIAL PRIMARY KEY UNIQUE,
U_nombre NCHAR(50),
);
The question would be if I can combine "PRIMARY KEY" with "UNIQUE". Can I
make any kind of combination of constraints?
Thanks
--
"And I'm happy, because you make me feel good, about me." - Melvin Udall
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Mart'n Marqu's email: martin@math.unl.edu.ar
Santa Fe - Argentina http://math.unl.edu.ar/~martin/
Administrador de sistemas en math.unl.edu.ar
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