On Sat, 2005-11-19 at 06:29, Alex Wang wrote:
> Great infomation. I didn't know that update is equal to delete+insert in 
> Postgres. I would be more careful on designing the database access method in 
> this case.

Just make sure you have regular vacuums scheduled (or run them from
within your app) and you're fine.  

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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