how to chane the type - Mailing list pgsql-sql

From tinar
Subject how to chane the type
Date
Msg-id DAV16M31Md40810sPbX000125d1@hotmail.com
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Responses Re: how to chane the type
List pgsql-sql
i have created a table
userlist with fields username varchar(10)
now i want to change it to username varchar(30)
without dropping or recreating the table.
how do i do it?
tina

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