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Transpose data best practice
Message
De
24/08/2002 14:05:08
Cetin Basoz
Engineerica Inc.
Izmir, Turquie
 
 
À
24/08/2002 12:40:42
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00693069
Message ID:
00693304
Vues:
29
0x00000000 was there to create a column that's enough to hold an integer. You can do 1000000*0 (assuming max value would be 1000000) too. Even you could live w/o it and just try 0.
Cetin

>Cetin,
>
>What does 0x00000000 do? I ran into an error in this line. However, I got the idea. I think I can make changes to the code to implement our requirements.
>
>Thanks
>
>>>Hi all,
>>>
>>>Is there a best practice to transpose data in VFP based on a column or columns
>>>
>>>
>>>Example: Transpose data by F4, then F1
>>>Table1
>>>F1   F2   F3  F4
>>>AAA   1    1  8/22/02
>>>AAA   2    1  8/22/02
>>>AAA   3    1  8/22/02
>>>BBB   1    1  8/22/02
>>>BBB   2    1  8/23/02
>>>CCC   3    1  8/23/02
>>>
>>>Result:
>>>
>>>F4       F2 F3AAA F3BBB F3CCC
>>>8/22/02   1     1     1     -
>>>8/22/02   2     1     1     -
>>>8/22/02   3     1     -     -
>>>8/23/02   2     -     1     -
>>>8/23/02   3     -     -     1
>>>
>>
>>
>>Ramil,
>>There vfpxtab.prg (_genxtab). However depending on your needs it might be much more effective to create your own version. Your data sounds like one that vfpxtab wouldn't handle. ie (assuming your result set have a typo for 'BBB' series :
>>
>>
select distinct f1 from myTable into array arrExtraCols
>>IF _Tally = 0
>>	MESSAGEBOX('No rows to process')
>>	RETURN
>>endif
>>&& Assuming 'F3'+F1 values qualify to be a fieldname
>>lcExtra = ''
>>for ix=1 to alen(arrExtraCols,1)
>>  lcExtra = lcExtra + ',0x00000000 as F3'+trim(arrExtraCols[ix,1])
>>endfor
>>select distinct f4,f2 &lcExtra from myTable into cursor xTabbed readwrite
>>scan
>> scatter name oRecord
>> select myTable
>> for ix=3 to fcount('xTabbed')
>>   locate for f4 = oRecord.f4 and f2 = oRecord.f2 and ;
>>       upper(f1) = substr(field(ix,'xTabbed'),3)
>>   store f3 to ('oRecord.'+field(ix,'xTabbed'))
>> endfor
>> select xTabbed
>> gather name oRecord
>>ENDSCAN
>>browse
Cetin
Çetin Basöz

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