Need to narrow down select results!!

Question

I am kind of new at this, but i learn as i go and what i need. I am deployed to iraq and four of us made a Oracle db, but the man witht he most experience is gone.
i need to do something to this effect:
create table temp11 as (
select c.DIC,c.NSN,c.CYCLE_DATE,c.IMAGE_DATA,c.AAC,c.Z01,c.CYCLE_DT,b.LAST_LOCATION,b.LAST_DATE
from itv a, itv_service b, temp10 c
where a.doc_no = substr(c.image_data,30,14)
and a.tag_id = b.tag_id
and b.CONSIGNEE_DODAAC = substr(c.image_data,30,6)
and b.last_date in (select max(d.last_date) from itv_service d));
when i run this query with out the last line it returns in excess of 500,000 rows and i know that some are old, all i need is to associate the most current last_location and last_date witheach substr(c.image_data,30,14) (which are doc numbers)
i have browsed thru oracle fourms for about two days trying different querys but nothing is working... any help is awesome
the table desc are:
SQL> desc ITV
Name Null? Type
DOC_NO VARCHAR2(17)
TCN VARCHAR2(17)
NSN VARCHAR2(25)
NOMEN VARCHAR2(50)
QTY CHAR(5)
UI CHAR(2)
MISC VARCHAR2(30)
TAG_ID VARCHAR2(9)
BUMPER_NO VARCHAR2(15)
MODEL_NO VARCHAR2(15)
SERIAL_NO VARCHAR2(15)
COMMODITY_CD VARCHAR2(30)
SQL> desc ITV_SERVICE
Name Null? Type
LEAD_TCN VARCHAR2(17)
TAG_ID NOT NULL VARCHAR2(9)
CONSIGNEE_DODAAC CHAR(6)
CONSIGNOR_DODAAC CHAR(6)
CONTAINER_NO VARCHAR2(20)
POE CHAR(3)
POD CHAR(3)
WRITE_DATE DATE
LAST_LOCATION VARCHAR2(60)
LAST_DATE DATE
MISSION VARCHAR2(11)
UNIT VARCHAR2(12)
CLASS VARCHAR2(12)
FREE_TEXT VARCHAR2(40)
ULN VARCHAR2(20)
UIC CHAR(5)
SHIPMENT_UNIT_NO VARCHAR2(40)
UNIT_HOME_STATION VARCHAR2(40)
TAGCLOSED CHAR(3)
SQL> desc TEMP10
Name Null? Type
DIC CHAR(3)
NSN CHAR(13)
CYCLE_DATE DATE
IMAGE_DATA NOT NULL CHAR(80)
AAC CHAR(6)
Z01 CHAR(3)
CYCLE_DT DATE
thanks

Answer 1

Does this help
select dic, nsn, cycle_date, image_data, aac,
    z01, cycle_dt, last_location, last_date
from
    select c.dic, c.nsn, c.cycle_date, c.image_data, c.aac,
        c.z01, c.cycle_dt, b.last_location, b.last_date,
        max(b.last_date) over (partition by substr(c.image_data,30,14)) max_date
    from itv a, itv_service b, temp10 c
    where
        a.doc_no = substr(c.image_data,30,14)
    and a.tag_id = b.tag_id
    and b.consignee_dodaac = substr(c.image_data,30,6)
where last_date = max_date    It uses the max analytic function to generate a maximum date for each substr(c.image_data,30,14), the outer select just returns those rows where the last date matches the max.