sql server - SQL : Test if a column has the "Not Null" property -

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is there simple query return whether specific column allows nulls?
want change part of db upgrade script.

alternatively, better change it, if set?

edit : sql server (needs support 2000 or later)

any particular rdbms?

in sql server

use master  select columnproperty( object_id('dbo.spt_values'),'number','allowsnull')

or (more standard)

select is_nullable  information_schema.columns  table_schema='dbo'        , table_name='spt_values'        , column_name='number'

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