hi
I have two tables:
table: XXXX
idcode varchar(15) -->references (idcode) table YYYY
latitude float
longitude float
time timestamp
p_a char(1)
barcode....
address....
idprog serial... -->primary key
flag boolean
table YYYY
idfact numeric(7,0) --->references .....
idcode varchar(15) --->primary key
name varchar(20)
I want to exctract the last operation of table XXXX for each idcode of
table YYYY where idfact=123
I HAVE THIS QUERY BUT IT IS TOO SLOW (10 SECONDS):
select XXXX.*,YYYY.name from YYYY,XXXX join (select
XXXX.idcode,max(XXXX.tempo) as tempo from XXXX,YYYY where
YYYY.idfact=123 and XXXX.idcode=YYYY.idcode group by XXXX.idcode)
temptable on (temptable.tempo=XXXX.tempo and
temptable.idcode=XXXX.idcode) where YYYY.idfact=123 and
XXXX.idcode=YYYY.idcode order by YYYY.name;
PLEASE HELP ME
--
francescosaf
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