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alter multiple tables

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NOT NULL
 
I want to extend the length of varchar in all tables.
 
Since I have a lot of tables and mirrored backups, I am wondering if there is a way to alter automatically all tables where colname matches 'username'
 
Is there a way to do this?
 
Marton
Hello,
 
I have in every table columns like:
username character varying(20)

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