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All Combinations of Group Members (challenging)
Message
De
08/09/2005 19:12:48
 
 
À
08/09/2005 15:50:56
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Versions des environnements
Visual FoxPro:
VFP 9
OS:
Windows XP SP2
Network:
Windows 2003 Server
Database:
Visual FoxPro
Divers
Thread ID:
01047849
Message ID:
01047919
Vues:
7
If I understand correctly, you need a function that will produce what I think is called a Cartesian product from a table for specific fields. It is always from the same table, but the number of fields is variable. The following is VFP 6 code and I'm sure it can be improved, but it might be a good start. Bear in mind that the result set could be HUGE, especially as the number of fields grows.

If I'm wrong.......wasn't first time and won't be last
PARAMETERS tcTable,tcFields
**  tcFields is a comma delimited list of field names
N=ALINES(aFlds,STRTRAN(tcFields,',',CHR(13)))
lcSQL_1 = ""
lcSQL_2 = ""
FOR I = 1 TO N
  lcSql_1 = lcSql_1 + ",c" + TRANS(I) + "." + aFlds[I]
  lcSql_2 = lcSql_2 + "," + tcTable + " c" + TRANS(I)
ENDFOR
lcSQL = "SELECT " + SUBSTR(lcSql_1,2) + " FROM " + SUBSTR(lcSql_2,2)
&lcSql
>Hi All,
>
>I'm hoping someone can help me out here.
>
>I want to find out how I can generically obtain all the different combinations of group members. The trick is the number of groups is not set and neither is the number of group members.
>
>Example:
>
>A table has a group of name fields, could be one name, could be three or four names. The same table has a group of addresses, again could be one or two or three.
>
>I want to create a cursor that contains one record for each combination of name and address.
>
>Record 1: name1+address1
>Record 2: name2+address1
>Record 3: name3+address1
>Record 4: name1+address2
>Record 5: name2+address2
>Record 6: name3+address2
>
>If it were only name and address that would be alright, however the trick is to get it to work so that another group could be added, say company names and there are more one or more company names as well.
>
>In that case the cursor should look something like the following:
>
>Record 1: name1+company1+address1
>Record 2: name2+company1+address1
>Record 3: name3+company1+address1
>Record 4: name1+company2+address1
>Record 5: name2+company2+address1
>Record 6: name3+company2+address1
>Record 7: name1+company1+address2
>Record 8: name2+company1+address2
>Record 9: name3+company1+address2
>Record10: name1+company2+address2
>Record11: name2+company2+address2
>Record12: name3+company2+address2
>
>Aloha,
>
>James
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