I'm using PostgreSQL 9.1 and I have a users table with a login column.

login names are case-sensitive, for example Bob, MikE, john. I would like to transform all these records into lowercase. How can I do that?

1 Answer 1


You can do this:

UPDATE table_name SET column=lower(column)

Refer to www.postgresql.org/docs/9.1/static/functions-string.html

  • 3
    And if you'd like to know how many rows were affected, a simple UPDATE table_name SET column = LOWER(column) WHERE column != LOWER(column); will do. Mar 28, 2018 at 13:38
  • I get this error HINT: No function matches the given name and argument types. You might need to add explicit type casts. while trying this.
    – Surya
    Oct 11, 2019 at 7:13

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