sarath kumar wrote: > > i hava a table tbl_tmstmp with date and time as 2 > different columns (tm_date number)and tm_time > varchar2(6). > select * from tbl_tmstmp; > tmstmp_id tm_date tm_time > -------- -------- ------- > 1 20020502 12:30 > 2 20020503 19:30 > 3 20020503 23:30 > 4 20020504 00:30 > 5 20020504 02:30 > 6 20020504 08:30 > > i have requuirement to pickup the records which are > sysdate - 90 minutes. Assuming the sysdate is 20020504 > and time is 03:00 AM i need to pick up the first 4 > records. > > is it possible without using the UNION as DBAS are > picky about using UNIONS. > > thanks > Srini. >
where tm_date >= to_number(to_char(sysdate - 0.0625, 'YYYYMMDD')) and to_date(to_char(tm_date)||tm_time, 'YYYYMMDDHH24:MI') >= sysdate - 0.0625 Word of explanation : 0.0625 is 90 minutes expressed as a number of days (90 / 1440). The first condition is somewhat redundant with the second one. However, if tm_date is indexed and you have a huge number of rows, it will allow you to take advantage of the index, contrarily to the second condition, necessary to test the hour:minutes part. Oh .. not tested ... -- Regards, Stephane Faroult Oriole Software -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Stephane Faroult INET: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
