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ORA-20000 Cause and Solution

ORA-20000 Cause and Solution

Have you gotten the ORA-20000 error when working with Oracle PL/SQL? Learn what causes it and how to resolve it in this article. ORA-20000 Cause The ORA-20000 error code is displayed when there is some PL/SQL code that calls RAISE_APPLICATION_ERROR. Also, the code is... Read more
ORA-12514 Cause and Solution

ORA-12514 Cause and Solution

Are you getting an “ORA-12514: TNS:listener does not currently know or service requested in connect descriptor” error? Learn what causes it and how to resolve it in this error. ORA-12514 Cause If you try to connect to an Oracle database, you may receive... Read more
ORA-01400: cannot insert null into (string) Solution

ORA-01400: cannot insert null into (string) Solution

Have you gotten the “ORA-01400: cannot insert null into (string)” error? Learn what causes this and how to resolve it in this article. ORA-01400 Cause If you try to run an INSERT statement to insert data into a table, you may get this error. ORA-01400:... Read more
ORA-00972 identifier is too long Solution

ORA-00972 identifier is too long Solution

Have you gotten an “ORA-00972: identifier is too long” error? Learn what caused it and how to resolve it in this article. ORA-00972 Cause If you’re running an SQL statement that refers to another database object (table, view, sequence, synonym, and... Read more
ORA-00001 Unique Constraint Violated Solution

ORA-00001 Unique Constraint Violated Solution

Have you gotten an “ORA-00001 unique constraint violated” error? Learn what has caused it and how to resolve it in this article. ORA-00001 Cause If you’ve tried to run an INSERT or UPDATE statement, you might have gotten this error: ORA-00001 unique... Read more