Level Extreme platform
Subscription
Corporate profile
Products & Services
Support
Legal
Français
Building a complex query
Message
General information
Forum:
Visual FoxPro
Category:
Other
Environment versions
Visual FoxPro:
VFP 6
OS:
Windows 2000 SP4
Network:
Windows 2000 Pro
Database:
Visual FoxPro
Miscellaneous
Thread ID:
00980679
Message ID:
00981178
Views:
67
>>>LIKE clause is NOT rushmore optimizable (till VFP 9 if I remember corectly). Also If You want this clause to be optimazable the must change the WHERE condition to match the index. Can You post how the table is indexed?
>>
>>Borislav
>>
>>IF .NOT. EMPTY(consig) && If this variable contains Company name
>> consig = upper(TRIM(consig))
>> cWhere = cWhere + IIF(lAnd," AND ","") + "upper(trim(globalnew.Company)) LIKE '%"+consig+"%'" && Add ' before first & after second %
>> lAnd = .t.
>>ENDIF
>>
>>Index is upper(trim(company))
>>
>>Thanks
>>
>>Colin
>
>This type of INDEX may cause trouble. It is not a good idea to INDEX ON TRIM(). If You want the index to be left justified use
>INDEX ON PADR(UPPER(ALLTRIM(Company)), 30, " " ) TAG ... where 30 is length of Field Company

>
>As I said LIKE clause is not Rushmore Oprimizable in VFP 8 and below. In VFP 9 it is (AFAIK).
>
>UPDATE: In VFP Like Clause is Rushmore Optimazaple ONLY in this Case
>
>upper(globalnew.Company) LIKE '"+consig+"%'"
>
>
>w/o first %

Borislav

Never had a problem with a trim index - been using them for years - what sort of problem do you forsee?

Thnks very much for all your help

Colin
Specialist in Advertising, Marketing, especially Direct Marketing

I run courses in Business Management and Marketing
Previous
Next
Reply
Map
View

Click here to load this message in the networking platform