Delete all except 3
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Thread: Delete all except 3

  1. #1
    Join Date
    Sep 2000
    Location
    VA
    Posts
    343
    Hi all,

    I need to write a PL/SQL code to delete all records except the first 3 for a particular field value in a table.
    Does anyone know a fast way of doing it??

    Shiva.

  2. #2
    Join Date
    Nov 2000
    Location
    Charlotte
    Posts
    88
    Here's just a really high-level example of a PL/SQL statement. It may not be exactly what you're looking for, but I hope it helps in some way.


    CURSOR update_cur
    IS
    SELECT FIELD_A AND THE REST OF THE FIELDS
    FROM
    TABLE_01;

    keep_record_counter number(1) := 0;
    delete_counter number(5) := 0;

    BEGIN
    FOR update_rec IN update_cur
    LOOP
    If keep_record_counter = 3
    then
    delete the rest of the records
    else
    IF field_a = whatever
    then
    keep the record
    add one to the keep_record_counter
    else
    delete the record
    add one to the delete_counter
    end if
    end if;

    If the delete_counter := 5000
    THEN
    do a commit
    end if;
    END LOOP;
    END;

    also see:
    [url]http://dbasupport.com/oracle/faq/Detailed/325.shtml[/url]


    [Edited by smoothyc on 02-28-2001 at 09:54 AM]

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