Help with the merger of the table

Hello. I have the following query:

Select a.prospect, b.status_dt, c.status_dt
ttms.prospect a, ttms.prospect_exfc b, ttms.prospect_imap c
where a.prospect = c.prospect (+)
and a.prospect = b.prospect (+)
and trunc (nvl (c.status_dt, b.status_dt)) > = (trunc(sysdate-45))
and nvl (c.status, b.status) in('S','S2','S3','I','W','SC','TM');

I would select only one of the two columns of status_dt. I want to get the status_dt for the most recent status_dt column. So, if b.status_dt is 2009-03-21 and c.status_dt is 2009-03-23 so I only shoot c.status date because it is the most recent. Is this possible?

greatest() function is what you want, but be careful to NULL values:

with my_tab as (select trunc(sysdate) col1, sysdate col2 from dual union all
                select null col1, sysdate col2 from dual union all
                select sysdate-1 col1, null col2 from dual union all
                select sysdate-2 col1, sysdate - 1 col2 from dual)
-- end of data setup
select col1,
       col2,
       greatest(col1, col2) res1,
       greatest(nvl(col1, to_date('01/01/1900', 'dd/mm/yyyy')), nvl(col2, to_date('01/01/1900', 'dd/mm/yyyy'))) res2
from my_tab;

COL1                  COL2                  RES1                  RES2
--------------------- --------------------- --------------------- ---------------------
23/03/2009 00:0:00    23/03/2009 14:13:01   23/03/2009 14:13:01   23/03/2009 14:13:01
                      23/03/2009 14:13:01                         23/03/2009 14:13:01
22/03/2009 14:13:01                                               22/03/2009 14:13:01
21/03/2009 14:13:01   22/03/2009 14:13:01   22/03/2009 14:13:01   22/03/2009 14:13:01  

Tags: Database

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