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SQL Syntax

How do I find duplicate field values easily? by JDurbin
Posted: 24 Jan 01

This example uses the customer table from Tastrade
USE ADDBS(_SAMPLES)+"tastrade\data\customer"
Find duplicate fields
General syntax:
SELECT COUNT(MyField) - 1 as Dupes, MyField ;
FROM MyTable ;
GROUP BY MyField ;
HAVING COUNT(MyField) > 1 ;
ORDER BY Dupes DESCENDING ;
INTO CURSOR cDuplicates

Example:
SELE COUNT(country) - 1 as Dupes, country ;
FROM customer ;
HAVING COUNT(country) > 1 ;
ORDER BY Dupes DESC ;
GROUP BY country


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