Documentation at http://www.postgresql.org/docs/8.0/interactive/datatype.html#DATATYPE-SERIAL says:

"In most cases you would also want to attach a UNIQUE or PRIMARY KEY constraint to prevent duplicate values from being inserted by accident, but this is not automatic."

and

"*Note: * Prior to PostgreSQL 7.3, serial implied UNIQUE. This is no longer automatic. If you wish a serial column to be in a unique constraint or a primary key, it must now be specified, same as with any other data type."

Miroslav Åulc, CEO
StartNet s.r.o.
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Sam Adams wrote:

I read at http://jamesthornton.com/postgres/FAQ/faq-english.html#4.15.1
that when a serial is created then an index is created on the column.
However I can't seem to find this anywhere in the PoistgreSQL manual. Is
this true? Thanks.

-Sam

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