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RE: Help with sql identifying dup constraints

From: Jacques Kilchoer <>
Date: Thu, 10 Jun 2004 10:16:26 -0700
Message-ID: <B5C5F99D765BB744B54FFDF35F60262119FC24@irvmbxw02>

But the "duplicates" were surely check constraints (sys.cdef$.type# = 1) and there was only one "not null" check constraint (sys.cdef$.type# = 7) Even in 8.1 you could only have one "not null" check constraint (type# = 7). I don't remember ever trying it on 8.1.4 but it's definitely true on 8.1.6.  

e.g. you get different type# values in sys.cdef$ for constraint X versus constraint Y in this example, even though, looking at dba_constraints, they seem to have identical characteristics.  

create table t
  (n1 number constraint X not null,
   n2 number,
   constraint Y check ("N2" IS NOT NULL)  ) ;    

SQL> select * from v$version ;

Oracle8i Enterprise Edition Release - Production PL/SQL Release - Production
CORE Production
TNS for Solaris: Version - Production NLSRTL Version - Production  

SQL> create table t (n number not null) ; Table créée.  

SQL> alter table t modify (n not null) ; alter table t modify (n not null)


ERREUR à la ligne 1 :
ORA-01442: column to be modified to NOT NULL is already NOT NULL

From: [] On Behalf Of Duret, Kathy Sent: jeudi, 10. juin 2004 07:31
To: ''
Subject: RE: Help with sql identifying dup constraints

well, you can, at least in 8.1.4  

When I came here I found up to 10 not null constraints on the same columns.  

Got them all off and found some again.... seemed the other choke ... dba.... didn't understand that not null was a check constraints and for some reason kept putting them on ... I think via Toad (I never get a straight answer from him) Then we I showed him on some new tables he created all the dups, instead of deleted them, he disabled them all.....  

gotta love it. if there is a way in Oracle someone can use and abuse it!  


	-----Original Message-----
	From: Jacques Kilchoer []
	Sent: Wednesday, June 09, 2004 5:23 PM
	Cc: Barbara Baker
	Subject: RE: Help with sql identifying dup constraints

	Well, you can't have two "not null" constraints on a column (see example below showing the error) as far as I know.

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Received on Thu Jun 10 2004 - 12:13:26 CDT

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