I read in the archive 
(http://www.mail-archive.com/[email protected]/msg31637.html) :

"You cannot create the primary key after the fact using ALTER TABLE."

Is it possible to DROP a composite primary key constraint after the fact 
with ALTER TABLE? The table was created as follows:

CREATE TABLE [WRDS] (
    [ttl] int NOT NULL,
    [pos] int NOT NULL,
    [wrdid] int NOT NULL,
    [edln] varchar(8)
      CONSTRAINT [PK_WRDS] PRIMARY KEY ([ttl], [pos], [wrdid])
);
CREATE INDEX [IX_WRDID] ON [WRDS] ([wrdid]);



Thanks
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