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" <[EMAIL PROTECTED]>
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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Author: Shaleen
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