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Reg. Postgres Unique contraint

Sajjad Abid <abidsajjad@gmail.com>

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From: Sajjad Abid <abidsajjad@gmail.com>
To: pgsql-performance@lists.postgresql.org
Date: 2024-11-27T04:14:36Z
Lists: pgsql-performance 
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.

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*Thanks & Regards, Sajjad Abid*