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Developer-C 11.1
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WITH yourTable AS ( SELECT 1 AS id, 'Hari' AS name FROM dual UNION ALL SELECT 2, 'Hari' FROM dual UNION ALL SELECT 3, 'Hari' FROM dual ) SELECT name, TO_CHAR(name || '-' || ROW_NUMBER() OVER (PARTITION BY name ORDER BY id)) AS name_new FROM yourTable ORDER BY name;
NAME
NAME_NEW
Hari
Hari-1
Hari
Hari-2
Hari
Hari-3