>>>Hello.
>>>I have a table with 200 000 records. (not much i think)
>>>I do next SQL Select to display how many products in each group
>>>
>>> Select group, Count(*) As _count;
>>> FROM table;
>>> Where table.manufactureID = manufactureID;
>>> GROUP By group;
>>> ORDER By group;
>>> Into Cursor _curgroup
>>>
>>>As result I have 420 records.. but my SQL time nearly 3 seconds.
>>>I have index by ManufactureID and by Group for Rushmore optimization.
>>>I have very fast computer with 1Gb RAM.
>>>
>>>Is it normal performace? May I get performance better? Because when i navigate in form from one Manufacture to another.. I have 3 sec delay.. and it looks not good ;(
>>>
>>>Thanks
>>>Denis
>>
>>VFP is not able to optimize GROUP BY and/or ORDER BY.
>>
>>you can remove ORDER BY because VFP GROUP BY method order the proiection,
>>and remember m. prefix:
>>

>>Select group, Count(*) As _count;
>>FROM table;
>>Where table.manufactureID = m.manufactureID;
>>GROUP By group;
>>Into Cursor _curgroup
>>

>>
>>Or writes a XBase program
>>

>>Select group, Count(*) As _count;
>>FROM table;
>>Where .F.;
>>GROUP By group;
>>Into Cursor _curgroup READWRITE
>>
>>* optimized grouping
>>TRY
>> SELECT 0
>> USE DBF("table") AGAIL ALIAS _table ORDER manufactureID_group && A COMPOSED INDEX, like BINTOC(m.manufactureID)+Group
>> SET EXACT OFF
>> IF SEEK(BINTOC(m.manufactureID))
>>   SCAN WHILE manufactureID = m.manufactureID
>>        INSERT INTO _curgroup VALUES (_table.group,0)
>>        COUNT WHILE group = _curgroup.group AND manufactureID = m.manufactureID TO _count
>>        REPLACE IN _curgroup _count WITH m._count
>>   ENDSCAN
>> ENDIF
>>FINALLY
>> SET EXACT ON && restore SET EXACT
>> USE
>>ENDTRY
>>

>
>
>Hi Fabio
>>> you can remove ORDER BY because VFP GROUP BY method order the proiection,
>and remember m. prefix:
>
>Not realy, Group by without Order by does not make record order ;)

Give me a example please. You cannot found it.