How to List Duplicate Records in a Field

Last reviewed: April 30, 1996
Article ID: Q115617

The information in this article applies to:

Microsoft FoxPro for MS-DOS, versions 2.0, 2.5, 2.5a, 2.5b, 2.6
Microsoft FoxPro for Windows, versions 2.5, 2.5a, 2.5b, 2.6
Microsoft FoxPro for Macintosh, versions 2.5b, 2.5c

This article describes how to generate a list of duplicate records in a database.

The following code uses a query to generate the list of duplicates and then stores it in a cursor named LISTING:

   USE c:\foxprow\tutorial\invoices
   SELECT invoices.cno, COUNT(invoices.cno) FROM invoices ;
    GROUP BY invoices.cno ;
    HAVING COUNT(invoices.cno)>1 ;
    INTO CURSOR listing

There will be two fields in the cursor LISTING, the first being customer numbers that have duplicates, and the second being the number of duplicates for that customer number.

Additional reference words: FoxMac FoxDos FoxWin 2.00 2.50
2.50a 2.50b 2.60
2.50c
identical same
repeated table
KBCategory: kbprg
KBSubcategory: FxprgGeneral

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Last reviewed: April 30, 1996
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