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Delete the duplicate record, but based on the contents of two fields.

Posted on 2013-01-21
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Last Modified: 2013-01-22
HI!
When only the contents of one field defines which record is duplicated, I know to create the phrase  SQL to delete.
But in this case, not.
Because, I need to delete the duplicate record, but based on the contents of two fields in the table.
When the two fields together, repeat content.

Example:
 Field1 and  Field2

2345|456|->keep
2346|358|->keep
2347|234|->keep
2347|675|->keep
2347|456|->keep
2347|456|------>delete
2347|456|------>delete
2347|432|->keep
2348|432|->keep

Can anyone help me by writing a sample in SQL?
Please use only standard SQL commands.
Because DB is to use the Firebird, and all DBs perform  standards commands.
Thank you very much.
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Question by:adrex
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3 Comments
 
LVL 39

Accepted Solution

by:
Pratima Pharande earned 500 total points
ID: 38804061
try this .. t is your tablename

TABLE tmp AS SELECT DISTINCT(t.Field1,t,Field2), * FROM t;
DROP TABLE t;
ALTER TABLE tmp RENAME TO t;

refer
http://stackoverflow.com/questions/1746213/how-to-delete-duplicate-entries-in-postgresql
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LVL 39

Expert Comment

by:Pratima Pharande
ID: 38804075
try this also

using single query

http://wiki.postgresql.org/wiki/Deleting_duplicates
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Author Comment

by:adrex
ID: 38806780
pratima_mcs
From your example. I got to formulate a solution.
Same I was far more extensive than yours.
And your example uses command incompatible with the Firebird, but I got to make replacement by equivalents.
It worked.
Thank you.
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