obtaining column names from tables or views

moin,<br /><br />I've got a question. I'm scripting against an existing postgresql database environment and need to
tweakqueries based on the columns in the views or tables, how can if find these w/o querying the tables or views. <br
/><br/>Currently I execute the querie and collect the columns but this is rather expensive, silly and fails when the
tableor view is empty.<br /><br />-- <br />Met vriendelijke groeten/with kind regards<br /><br />        John van
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