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SQL to get the alphabetical next
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À
01/04/2003 00:52:24
Km Kwun
Eastop Consultants Limited
Nt, Hong Kong
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Divers
Thread ID:
00771820
Message ID:
00772347
Vues:
17
This message has been marked as the solution to the initial question of the thread.
Hi Km,

I think following query should work for you. You've to use TOP 1 to get one record and ORDER BY to get NEXT alphabetical record.
SELECT TOP 1 *
FROM MyTable
WHERE LastName > @lastName
 OR (LastName=@LastName AND FirstName > @FirstName )
 OR (LastName=@LastName AND FirstName = @FirstName  AND CustID > @CustID)
 ORDER BY lastname, firstname
The SQL Server query optimizer is much more sophisticated than in VFP but it's hard to tell how your query will perform w/o actually run it.

>Dear Sergey and Michael,
>
>Thanks for your suggestions. However I'm afraid the code is still not able to return the correct record. Take the following data as an example:
>CustID=73, LastName='Barret', FirstName='Amy'
>"Berret, Amy" is alphabetically greater than "Barnes, John", but "Amy" is smaller than "John"
>
>I'm thinking about the following command but I don't know if this is a correct and good statement. Grateful if you could advise.
>SELECT *
>FROM MyTable
>WHERE (LastName > @lastName
> OR (LastName=@LastName AND FirstName>=@FirstName))
> AND CustID>@CustID
>
>By the way, I found that the TOP keyword is sometimes slow in VFP if the record set defined by the WHERE clause is large, since VFP have to firstly retrieve the large records set and then sort them and return the top one. I'm a newbie in SQL server, I don't know if the mechanism in SQL server is similar.
>
>KM
>
>
--sb--
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