see, now that answers my question! I haven't done any work at all with
object tables so I haven't seen any of this
thanks Arup!
- Arup Nanda <arupnanda_at_hotmail.com> wrote:
> In case of object tables, the constraints are defined on the most
> primitive
> of the objects. For instance, you have a table MYTAB defined on an
> object
> type MYTYPE1 which references in MYTYPE2. An attribute of MYTYPE2,
> ATTR1 has
> the constraint defined as not null. In this case the column_name in
> dba_cons_columns will say "MYTAB"."MYTYPE1"."MYTYPE2" to show the
> hierarchy.
> Since each of these values could be 30 chars long, with the dots and
> double
> quotes, the column_name could easily be very long. Therefore,
> VARCHAR2(4000).
>
> HTH
>
> Arup
>
>
>
>
>
>
> >From: Rodd Holman <roddholman_at_hotpop.com>
> >Reply-To: ORACLE-L_at_fatcity.com
> >To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> >Subject: Re: this doesn't look right
> >Date: Mon, 30 Dec 2002 14:53:56 -0800
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> >X-Sender: Rodd Holman <roddholman_at_hotpop.com>
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> >
> >This still begs the question why varchar(4000) in the underlying
> table
> >if column names are only allowed to be 30? Is this table used for
> other
> >objects that can have a longer name? If so what?
> >
> >Rodd
> >
> >On Mon, 2002-12-30 at 16:08, Shaleen wrote:
> > > Varchar2(4000) is coming from sys.attrcol$ table. dba_tab_columns
> does
> >not
> > > have a join this table. I am sure there are people on this list
> who'll
> > > enlighten me about contents of sys.attrcol$ table.
> > >
> > > select u.name, c.name, o.name,
> > > decode(ac.name, null, col.name, ac.name), cc.pos#
> > > from sys.user$ u, sys.con$ c, sys.col$ col, sys.ccol$ cc,
> sys.cdef$
> > > cd,sys.obj$ o, sys.attrcol$ ac
> > > where c.owner# = u.user#
> > > and c.con# = cd.con#
> > > and cd.type# != 12 /* don't include log groups */
> > > and cd.con# = cc.con#
> > > and cc.obj# = col.obj#
> > > and cc.intcol# = col.intcol#
> > > and cc.obj# = o.obj#
> > > and col.obj# = ac.obj#(+)
> > > and col.intcol# = ac.intcol#(+)
> > >
> > > -Shaleen
> > > ----- Original Message -----
> > > To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> > > Sent: Monday, December 30, 2002 12:23 PM
> > >
> > >
> > > > As part of the process of making sure that null/not null
> constraints
> > > > are consistent across development/staging/production, I'm
> looking at
> > > > the dba_cons_columns table.
> > > >
> > > > Now, as far as I know, column_names are limited to 30
> characters,
> > > > correct? If so, why is the column_name column in
> dba_cons_columns
> > > > (9.2.0.1) a varchar2(4000)? I realize that the "extra space"
> isn't
> >used
> > > > and is never allocated so it's not like this is wasteful.
> > > >
> > > > But it's inconsistent with everything else, since
> dba_tab_columns has
> >a
> > > > column_name column of varchar2(30).
> > > >
> > > > anyone know why this is like this?
> > > >
> > > > Rachel
> > > >
> > > > __________________________________________________
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> >
> >Romans 1:16-17
> >
> >
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Received on Tue Dec 31 2002 - 09:14:11 CST