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I want all of the entries in my relation to be lower case.

I tried

ALTER TABLE tableName SET (columnName = lower(columnName));

but it didn't seem to work. Could someone point me in the right direction?

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    If you always want to treat your data case-insensitive, consider the data type citext, provided by the additional module of the same name. More details. Commented Mar 14, 2014 at 2:35

1 Answer 1

Reset to default
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UPDATE TABLE tableName SET columnName = lower(columnName);

Should work better :)

Edit:

The data you insert is up to you to insert lowercase, it wont be changed. If you need to do that, you can do it in a trigger or rule.

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