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Microsoft: FoxPro FAQ

SQL Syntax

report/remove duplicate records by danceman
Posted: 25 Jan 07

To remove duplicate records from a table.  What field(s) determine a duplicate, such as

SSN, or  SSN and code assignment.  In my example shown I use SSN and a code that desinates a group assigned to.  The SSN can have more then one unique code assignment.

First verify duplicates with below command

select ssn,p_code count(*) from p_code group by ssn,p_code having count(*) >1
The COUNT function produces a total of all records, but adding the GROUP BY there is a individual line for each unquie SSN+Code.  Adding the having clause > 1 shows only the duplicates.

Next make a file of all records without the dupiclates with this command

select * , count(distinct ssn+p_code) from p_code group by ssn,p_code into table temp
DISTINCT produces only one for each duplicate record and for each non-duplicate.  The temp table produced will have all fields plus a field added that shows the count.

Now zap the p_code table, then append from the file temp

The extra field in the temp gets drouped when you append.

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