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Swapping Values in Two Columns
Message
De
03/09/2013 09:21:38
 
 
À
03/09/2013 08:57:00
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Versions des environnements
Visual FoxPro:
VFP 9 SP2
OS:
Windows 8
Network:
Windows 2000 Server
Database:
Visual FoxPro
Application:
Desktop
Divers
Thread ID:
01581882
Message ID:
01581889
Vues:
51
J'aime (1)
>>>I'm trying to switch the values from two columns. Here's my code:
>>>
>>>
update Items;
>>>   SET cDesc = cIntDesc ;
>>>   , cIntDesc = cDesc
>>>
>>>This is a VFP database.
>>>Shouldn't that work?
>>>What is happening is that both columns get the original value that was in cIntDesc.
>>
>>
>>The changes have to occur in some order. You'll have to use a variable to hold one value temporarily.

>I understand. I just had a very strong memory of using code like this before. Maybe it was on a SQL Server database which apparently allows you to do this.

That is one of the few glitches in vfp SQL that is non-Standard. Discussed that a while back with Aleksey (when vfp still was maintained by MS) and his comment was along the lines "don't hold your breath hoping for this behaviour [in vfp] to change, deep xBase roots showing here".
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