How to create a column auto increment

Question

I want create a table with one column can
auto increase after insert each row, but I
don't know how to?
Thanks.

Answer 1

Oracle doesn't have a native auto-increment field like some databases, so you need to code one using a sequence. I've had good success using a trigger on my table like the following:
CREATE OR REPLACE TRIGGER SAMPLE_TRIGGER BEFORE
INSERT ON SAMPLE_TABLE FOR EACH ROW begin
     if ( :new.TEAM_KEY is null ) then
          select "SAMPLE_sequence".nextval into :new.TEAM_KEY from dual;
     end if;
end;