Re: List table with same column name

On Thu, 23 Oct 2003, Peter Childs wrote:

>
>
> On Thu, 23 Oct 2003 achill(at)matrix(dot)gatewaynet(dot)com wrote:
>
> > On Thu, 23 Oct 2003, Abdul Wahab Dahalan wrote:
> >
> > > Hi!
> > > How do I list all the tables in the database which has a same column name?.
> >
> > SELECT t1.relname,a1.attname,t2.relname from pg_class t1,pg_attribute
> > a1,pg_class t2,pg_attribute a2 where a1.attrelid=t1.oid and t1.relkind='r'
> > and a1.attnum>0 and a2.attrelid=t2.oid and t2.relkind='r' and a2.attnum>0
> > and t1.relname<t2.relname and a1.attname = a2.attname;
>
> That will not work.
>
> SELECT t1.relname,a1.attname,t2.relname from pg_class t1,pg_attribute
> a1,pg_class t2,pg_attribute a2 where a1.attrelid=t1.oid and
> t1.relkind='r'and a1.attnum>0 and a2.attrelid=t2.oid and t2.relkind='r'
> and a2.attnum>0 and t1.relname<t2.relname and a1.attname = a2.attname and
> a1.attisdropped=false and a2.attisdropped=false and t1.relname !=
> t2.relname;
>
> Why?
>
> Well two bugs.
> 1> Dropped Columns needed for 7.3.
> 2> Do you really need to know that column a in table 1 also appears in
> table 1?

Have you ever thought that x<y implies x!=y ?

>
> Peter Childs
>
> >
> > >
> > > Thanks
> > >
> > >
> > > ---------------------------(end of broadcast)---------------------------
> > > TIP 4: Don't 'kill -9' the postmaster
> > >
> >
> > --
> > -Achilleus
> >
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 5: Have you checked our extensive FAQ?
> >
> > http://www.postgresql.org/docs/faqs/FAQ.html
> >
>

--
-Achilleus