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Jason Palmer
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SQL query to select row with MAX date

I'm trying to return the row with the MAX date but the MAX funciton doesn't appear to be working. Below is the code I'm trying to run along with the outputMax-query.JPG: Any help you can provide will be very much appreciated.

select doc_prfx, doc_num, BKD_WGT, BKD_VOL, ACCEPTED_PCS, ACCEPTED_VOL, sum (ACCEPTED_WGT - BKD_WGT), sum (ACCEPTED_VOL - BKD_VOL), MAX(modified_date)

from 

(Select distinct 
c.car_id,
 b.doc_prfx, b.doc_num, 

f.wt_bfr_awb as BKD_WGT, f.vol_bfr_awb as BKD_VOL,

g.num_pcs as ACCEPTED_PCS,
g.ttl_wt as ACCEPTED_WGT, g.vol as ACCEPTED_VOL,

to_char(f.modified_date,  'DD-MON-YYYY HH24:MI:SS') as modified_date

from sbh_res_itnry a, sbh_car b, sbh_res c, sbh_res_cust d, fwb_res_data_aud e, sbh_res_aud f, sbh_AWB g
where c.car_id = b.car_id (+)
and c.car_id = a.car_id 
and c.car_id = d.car_id
and b.car_id = e.car_id (+)
and c.car_id = f.car_id 
and c.car_id = g.car_id
and a.aln_code = 'VS'
and a.flt_num = '0003'
and trunc (a.dep_date) = '04-APR-2017'
--and e.rmk_typ = 'BKL' --in (null,'BKL')
AND a.cncl_ind = 'N'
and d.cust_typ = 'AGT'
and b.cncl_ind = 'N'
and c.enq_ind = 'N'
and f.wt_bfr_awb is not null
and b.doc_prfx = '932'
and b.doc_num in ('51493422')
)
group by 

doc_prfx, doc_num, BKD_WGT, BKD_VOL, ACCEPTED_PCS, ACCEPTED_VOL,modified_date

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Oracle DatabaseSQL

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Jason Palmer

8/22/2022 - Mon
ste5an

To filter by that, you need a subquery. The MAX() aggregate itself does only a calculation. The normal approach is:

SELECT *
FROM yourQuery
WHERE dateColumn = ( 
    SELECT MAX(dateColumn) 
    FROM yourQuery
);

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Depending on the problem, the subquery must be correlated.
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Jason Palmer

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ste5an

Caveat: Test always both approaches. Cause ROW_NUMBER() is not necessarily always better.
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Jason Palmer

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thanks for you help guys
Your help has saved me hundreds of hours of internet surfing.
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