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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Query rewrite help needed
Jonathan,
I trust you meant to write:
"trunc(d1)=..."
rather than
"trunc(sysdate)..."
:-)
Do I win the $100?
-- Peter Moore Systems DBA, Mid-Range Centre of Expertise, Global Service Delivery, SchlumbergerSema, Reading Phone: 0118 963 6827 Email: pmoore7_at_slb.comReceived on Mon Mar 10 2003 - 11:20:34 CST
> -----Original Message-----
> From: Jonathan Lewis [mailto:jonathan_at_jlcomp.demon.co.uk]
> Sent: 10 March 2003 15:24
> To: Multiple recipients of list ORACLE-L
> Subject: Re: Query rewrite help needed
>
>
>
> Tim,
>
> Following your trunc() line, have you come
> across this feature of 9.2 (and some earlier
> versions) -
>
> create index t1_i2 on t1(d1);
> analyze table t1 compute statistics;
>
> select * from t1
> where trunc(sysdate) = '01-Dec-2002';
>
> Execution plan:
> -----------------------
> table access (by index rowid) of 'T1'
> index (range scan) of 'T1_I2' (non-unique)
>
> Note the index name, in particular.
>
> It's another little feature that takes away
> some of the hassle of getting the text
> 'just so'.
>
> How does it do it, you ask ? I'll leave it
> open for a while in case anyone wants to
> have some fun guessing.
>
> All correct answers received by 5 pm (GMT)
> tonight will go into a prize draw.
> Note - Answers must be written on the back
> of a USD$100 bill and delivered by hand to
> the author's bank manager be eligible.
>
>
> Regards
>
> Jonathan Lewis
> http://www.jlcomp.demon.co.uk
>
> Now available One-day tutorials:
> Cost Based Optimisation
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>
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>
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: 10 March 2003 13:43
>
>
> > In the same vein, I'd suggest rewriting:
> >
> > and trunc(a.seg_dep_date_time) = :seg_dep_date
> >
> > as:
> >
> > and a.seg_dep_date_time >= :seg_dep_date
> > and a.seg_dep_date_time < :seg_dep_date + 1
> >
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Jonathan Lewis
> INET: jonathan_at_jlcomp.demon.co.uk
>
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