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Home -> Community -> Mailing Lists -> Oracle-L -> RE: gnarly delete statement?
How about this:
delete from stupid_table s
where timestamp != (select min(timestamp)
from stupid_table
where b = s. b
and c = s.c
and d = s.d
and a = 2)
>
> Given a business rule that says a combination of three columns must
> be
> unique if and only if a fourth column equals a certain value, and if
> the table in question contains rows that violate this requirement,
> I'm
> trying to write a single SQL statement that will remove the
> duplicates.
> Of each set of duplicate rows, I'll delete the one with the latest
> insert timestamp.
>
> Let's call the columns
>
> a b c d timestamp
>
> The combination of b, c, and d must be unique if a = 2.
>
> I can get the duplicate row values along with the latest timestamp
> via
>
> select max(tstamp), a, b, c from
> my_table group by a, b, c having count(*) > 1
>
> But I can't figure out how to use that in a delete statement.
>
> Suggestions greatly appreciated!
>
>
> Paul Baumgartel
>
>
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Paul Baumgartel
> INET: treegarden_at_yahoo.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing
> Lists
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> --
> Author: Mohan, Ross
> INET: MohanR_at_STARS-SMI.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing
> Lists
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Paul Baumgartel INET: treegarden_at_yahoo.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mohan, Ross INET: MohanR_at_STARS-SMI.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Bellows, Bambi INET: BBellows_at_usg.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Fri Nov 02 2001 - 10:06:14 CST
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