=?UTF-8?B?0JDQvdC00YDQtdC5?= <[EMAIL PROTECTED]> writes:
>     In what way can I determine is the table system? ODBC driver does it 
> by checking table name's prefix: if it begins with 'pg_' - driver 
> desides that the table is system, but that's a bad idea.

Yup, that's been incorrect since PG 7.3.  The proper test is whether the
table is in the pg_catalog schema.

Depending on your purposes you might also want to exclude pg_toast.

                        regards, tom lane

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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
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