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Hoow do you drop a column in a table

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Using phppgadmin, I tried tropping a column in a table. I comes back to try DROP .. CASCADE. Went into psql and typed the following,

ALTER TABLE "MPC" DROP COLUMNG  do_not_use CASCADE

It appeared to work but did not drop the column. What is the dprocedure for dropping a column? an anyone point me to a document that tells EXACTLY how to do this? Also, how do you find out the dependencies it says it has? I know of none.

Art

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