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Last 5 records in SQL Select
Message
De
30/10/2007 07:19:45
Lutz Scheffler
Lutz Scheffler Software Ingenieurbüro
Dresden, Allemagne
 
 
À
30/10/2007 07:02:05
Erick Miranda
Formata Data Business - Grupo Linx
Contagem, Brésil
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Versions des environnements
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Network:
Windows NT
Database:
Visual FoxPro
Divers
Thread ID:
01264947
Message ID:
01264957
Vues:
12
Hi Erick,

thanks for your response.
Possibly I do express myself wrong.

The question is:
The records for the last (IOW greatest) five dates per customer. The value is in no way bound to date.
The date field is in no way ordered or the date will
follow any rule. There may be 1 to n records per user. Every day may exist only once per customer. (customer+date may create a candidate key).

Agnes
>Hi Agnes,
>
>>Hi All,
>>
>>I have a table that holds a time tabes status per customer.
>>
>>I would like to create an SELCT SQL that gives me the 5 most recent records per customer
>>
>>like
>>
>>customer, date,value
>>A,2007-01-01,1
>>A,2007-01-02,2
>>A,2007-01-03,3
>>A,2007-01-04,4
>>A,2007-01-05,5
>>A,2007-01-06,6
>>A,2007-01-07,7
>>A,2007-01-08,8
>>B,2007-01-02,2
>>B,2007-01-03,3
>>B,2007-01-04,4
>>B,2007-01-05,5
>>B,2007-01-16,6
>>B,2007-01-17,7
>>B,2007-01-18,8
>>C,2007-01-17,7
>>C,2007-01-18,8
>>
>>Result set:
>>A,2007-01-04,4
>>A,2007-01-05,5
>>A,2007-01-06,6
>>A,2007-01-07,7
>>A,2007-01-08,8
>>B,2007-01-03,3
>>B,2007-01-04,4
>>B,2007-01-05,5
>>B,2007-01-16,6
>>B,2007-01-17,7
>>C,2007-01-17,7
>>C,2007-01-18,8
>>
>>
>>Any idea how to achive this?
>>
>>Agnes
>

>Wouldn't be value's customer B from 4 until 8? (you putted 3 until 7)
>If your answer is yes. Try:
>
>SELECT mA.*;
>	FROM myTable mA;
>		, (SELECT customer, MAX(value) maxValue;
>				FROM myTable;
>				GROUP BY customer;
>			) mB;
>	WHERE 	mA.customer = mB.customer;
>		AND mA.value > mB.maxValue - 5;
>	ORDER BY mA.customer, mA.value
>
>Good luck!
Words are given to man to enable him to conceal his true feelings.
Charles Maurice de Talleyrand-Périgord

Weeks of programming can save you hours of planning.

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