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How can i create a Autonumber ? [message #370989] Sat, 29 July 2000 11:42 Go to next message
M.B.
Messages: 1
Registered: July 2000
Junior Member
I want to create a unique number in a column which get higher if i use a insert stateman, well a autonumber.
Is there a simple way to do this. Mabye i can move the ROWID into a column as a default.
Thx for Help.
Maik

*If someone can write a create table statemant it would really help*
Re: How can i create a Autonumber ? [message #370990 is a reply to message #370989] Mon, 31 July 2000 02:33 Go to previous message
Ivan
Messages: 180
Registered: June 2000
Senior Member
I think you'd better use sequence and trigger to generate unique number. Something like that:

SQL>CREATE SEQUENCE geo_uni_s START WITH 1;
SQL>CREATE TABLE geo (
unicod INTEGER CONSTRAINT nn_geo_unicod NOT NULL,
name CHAR(45),
CONSTRAINT pk_geo_unicod PRIMARY KEY ( unicod )
)
;
SQL>CREATE OR REPLACE TRIGGER geoUni
BEFORE INSERT ON geo
FOR EACH ROW
DECLARE
CURSOR c IS
SELECT geo_uni_s.nextval FROM dual;
v INTEGER;
BEGIN
IF :new.unicod IS NULL THEN
OPEN c;
FETCH c INTO v;
:new.unicod:=v;
END IF;
END;

;
And now just:
SQL>INSERT INTO geo(name) VALUES('name1');
Hope it helps.
Any comments? e-mail me at
ivan@volmed.org.ru
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