ORA-02443 & ORA-00955

Question

Hello guy;
I have a table with a unique constraint which should be made of three keys but made of one key. I decided to drop it and re-create it with the three keys but I got a message saying that says "ORA-02443: Cannot drop constraint - nonexistence constraint". And whenever I try to recreate that constraint with the same name, I get "ORA-00955: name already used bu an existing object."
What do I need to do because I am frustrated with this controversial error message?
Plz help.

Answer 1

Welcome to the forum.
Make sure to read {message:id=9360002} from the SQL and PL/SQL FAQ @ https://forums.oracle.com/forums/ann.jspa?annID=1535
Is your constraint created as quoted identifier? (between '"'s?):
{code}
SQL> create table t (col number);
Table created.
SQL> alter table t add constraint "t_Uk" unique(col);
Table altered.
SQL> alter table t drop constraint t_uk;
alter table t drop constraint t_uk
ERROR at line 1:
ORA-02443: Cannot drop constraint - nonexistent constraint
SQL> alter table t drop constraint "t_Uk";
Table altered.
{code}