Which version of Postgres are you using?
A column is character varying(50), also on this column a unique constraint is defined, but I found some duplicate values in this column for some records user_name character varying(50) CONSTRAINT user_name_unq UNIQUE ( user_name )Kindly help me to resolve this issue.-- Thanks & Regards, Sajjad Abid
pgsql-performance by date:
Соглашаюсь с условиями обработки персональных данных