Re: " Adding missing FROM-clause entry for table .... " problem.

Rajesh Kumar Mallah wrote:
> Hi ,
> 
> We find that if we alias a tablename and refer to that tablename in where cluase instead of reffering
> to the alias it produces wrond results.
> 
> EG:
> select to_char(a.generated, 'DD/Mon/YYYY' ) ,userid,email,descr from membership_invoice a join payment_classes
using(payment_class)
> join users using(userid)  join membership_status using(userid) where  membership_invoice.status='a' and granted is
falseand 
 
> membership_invoice.last_reminder is null and current_date - date(a.generated) > 4  limit 10 ;
> NOTICE:  Adding missing FROM-clause entry for table "membership_invoice"
> +-------------+--------+--------------------------+---------------+
> |   to_char   | userid |          email           |     descr     |
> +-------------+--------+--------------------------+---------------+
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> | 23/Nov/2002 |  34886 | pradeepk@trade-india.com | IID TradePass |
> +-------------+--------+--------------------------+---------------+
> 
> Where as merely rewriting the quer to use defined aliases gives the correct results.
> 
> select to_char(a.generated, 'DD/Mon/YYYY' ) ,userid,email,descr from membership_invoice a join payment_classes 
> using(payment_class) join users using(userid)  join membership_status using(userid) where  a.status='a' and granted
is
 
> false and a.last_reminder is null and current_date - date(a.generated) > 4   ;
> +-------------+--------+--------------------------------+------------------------+
> |   to_char   | userid |             email              |         descr          |
> +-------------+--------+--------------------------------+------------------------+
> | 12/Feb/2003 | 125182 | blackandwhitetextile@yahoo.com | Mini Silver MemberShip |
> | 13/Feb/2003 | 117512 | vaishnavipower@vsnl.net        | Mini Silver MemberShip |
> +-------------+--------+--------------------------------+------------------------+
> (2 rows)
> 
> 
> Can Anyone please explain if its a BUG for problem in my
> understanding 
> 
> 
> Regds
> Mallah.
It's not a bug.
You have two choices:
- remove alias "a" and use "membership_invoice."
- use alias "a", but you have to change "membership_invoice." into "a."

If you use alias, table is no longer available on it's own name.

Regards,
Tomasz Myrta