Oracle-L: Substraction SQL query

From: Jonny Delmont <jonny99delmont_at_yahoo.co.uk>
Date: Fri, 26 Jul 2002 05:43:22 -0800
Message-ID: <F001.004A347F.20020726054322@fatcity.com>

Hi DBAs,
I've another issue like my previous one. my date format is 'HH:MI:SS DAY DD-MON-YYYY' SQL>select * from j_transaction_log ;
TRANS_COUNT CHECKED_TIMESTAMP

----------- ----------------------------------------
       2150 01:13:47 FRIDAY    26-JUL-2002
       2162 01:15:01 FRIDAY    26-JUL-2002
       2170 01:16:27 FRIDAY    26-JUL-2002

How to write in sql statment to get the result like below on column TRANS_COUNT?
TRANS_COUNT CHECKED_TIMESTAMP

----------- ----------------------------------------
        0              01:13:47 FRIDAY    26-JUL-2002
       12             01:15:01 FRIDAY    26-JUL-2002
        8              01:16:27 FRIDAY    26-JUL-2002

Once again thanks in advance for your help. Regards,
Jonny

cosltemp-g.manoj_at_orbitech.co.in wrote: Alternative Solutn

select a.s_month,a.s_sum - b.s_sum
from x_test a,x_test b
where to_date(a.s_month,'MON') = add_months(to_date(b.s_month,'MON'),1) or rownum = 1

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