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How to set up a table where 2 columns together must be unique?

P: n/a
Hi all!

I want to create a table:

user_id: bigserial
user_name: text
user_company: text
password: text

How do I build this table so that user_name+user_company must be unique?
This way there can be only one of a given username for a given company name
but there can be more than one of a given username if they are with different

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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match

Nov 12 '05 #1
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