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VFP6.0 Optimize SQL
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00352764
Message ID:
00352813
Vues:
14
>Hi Bruce,
>>>
>>>I'd like to speed up my sql select statement and have tried everything I could think of to make it "Rushmore" optimized, to no avail.
>>>
>>>Here are two sql's, the first is slow, the second is fast.
>>>
>>>
>>>***5,323 records in 40.03 secs.
>>>select dam1, yr_bred, name, sex, sire1, booked_to, last_bred, p_b, date_foal, date_died, cause_deat, ;
>>>price_sold, buy_name, age_rec, life_earn, cl from master where category = "F" and type = "S" or ;
>>>type = "W" or type = "Y" order by dam1 into table foals nofilter
>
> Use optimizable function INLIST instead of or condition, if number of types <=24 (Inlist is limited by 24 codes).
>Is there an index on TYPE?
>
>
Or better of use native SQL operator IN
where category = "F" AND type IN ("S", "W", "Y")
--sb--
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