"Scott Marlowe" <[EMAIL PROTECTED]> wrote
>
> Under no circumstances should you do this with a database that has any
> data in it that you value.  pg_dump / pg_restore / psql are the
> preferred way of doing this.
>

Oh yeah, sorry for the miss leading information. My method is dangerous and 
can not cover all the cases (say you have an external stored column, etc).

Sorry about it,
Qingqing 



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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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