--- Joseph Syjuco <joseph@asti.dost.gov.ph> wrote:
> table1
> empno varchar(9) not null
> peer varchar(9) not null references table2(empno)
> superior varchar(9) not null references
> table2(empno)
>
> table2
> empno varchar(9)
> firstname varchar(20)
> lastname varchar(20)
>
> what i want to do is get all entries in table 1 and
> transform peer and
> superior fields (which contains empno) into their
> respective firstname +
> lastname in one query
>
> desired output
> empno peer superior
> 1000 John Smith Henry Dunst
> 2000 Juan dela Cruz Pepe Smith
Create a stored function that will return the fullname
of the "peer" or "superior" given an employee number
CREATE OR REPLACE FUNCTION get_name(VARCHAR(9))
RETURNS VARCHAR(50)
AS'
DECLARE v_empno ALIAS FOR $1; v_last VARCHAR(20); v_first VARCHAR(20); v_fullname VARCHAR(50);
BEGIN SELECT firstname,lastname INTO v_first,v_last FROM table2 WHERE empno=v_empno; v_fullname := '''';
v_fullaname:= v_first || '' '' || v_last; RETURN v_fullname;
END;'
LANGUAGE 'plpgsql';
then
type the ff. SELECT stmt:
SELECT empno,get_name(peer),get_name(superior)
FROM table1;
ludwig lim
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