Re: [SQL] create default

[Jens Hartwig]

> hi,how to set default filed+field
> 
> create table "table1"(
>   "cno1" char(10)  default NEW.cno2+NEW.cno3,
>   "cno2" char(10) ,
>   "cno3" char(10)
> );
> 
> I try pl/pgsql and pl/tcl  NOT RUN,
> 
> thanks

Try the following:

CREATE FUNCTION test() RETURNS opaque AS
    'BEGIN
        IF new.cno1 IS NULL THEN
            IF new.cno2 IS NULL THEN
                new.cno1 := substr(new.cno3,1,3); 
            ELSIF new.cno3 IS NULL THEN
                new.cno1 := substr(new.cno2,1,3); 
            ELSE
                new.cno1 := substr(new.cno2,1,3)||substr(new.cno3,1,3);
            END IF;
        END IF;
        RETURN new;
     END;'
LANGUAGE 'plpgsql';

CREATE TRIGGER test_trg
BEFORE INSERT OR UPDATE ON table1
FOR EACH ROW
EXECUTE PROCEDURE test();

INSERT INTO table1 (cno2, cno3) values ('abc', 'def');

SELECT * FROM table1;

Best regards, Jens Hartwig

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Jens Hartwig
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debis Systemhaus GEI mbH
10875 Berlin
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