Oracle table creation script question

Hi,

I have a table creation script in hand (written by another guy), and I'm trying to figure out why exactly the primary keys are created as they are:

For each table, the following sequence of steps is performed:

1. The table is defined, except that no column is designated as the PK.
2. A unique index is created on a column (the PK-designate).
3. An ALTER TABLE ADD CONSTRAINT command is issued to add the PK constraint on that column.

Can someone comment on the benefits of doing things this way? Full storage parameters are included in steps 1 & 2, if that helps.

Thanks for any assistance,
Tom C. Received on Tue Jun 12 2001 - 15:06:08 CDT