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07/09/2003 11:30:50
 
 
À
07/09/2003 09:40:48
Hilmar Zonneveld
Independent Consultant
Cochabamba, Bolivie
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Titre:
Divers
Thread ID:
00826775
Message ID:
00826864
Vues:
26
Hi Hilmar,

>The resulting variable length can cause problems in some cases, like >indexing. In your SELECT example, if the first record in the table happens >to be empty, the length of the resulting expression will cause problems.

It is false, also if first record is NULL,empty or another string or memo field.
CREATE CURSOR mcur ( a c(1) null)
INSERT INTO mcur VALUES (null)
SELECT LEFT(a,212) f1 FROM mcur INTO CURSOR pippo
? FSIZE('f1','pippo')
If you analize VFP indexing, you found this:

VFP not support variable lenght index keys.
INDEX ON cField        TAG tag1
INDEX ON RTRIM(cField) TAG tag1
have equal key set.

Fabio
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