What is unique constraint violated error in Oracle?

The ORA-00001 message is triggered when a unique constraint has been violated. Essentially the user causes the error when trying to execute an INSERT or UPDATE statement that has generated a duplicate value in a restricted field.

How do I find unique constraints in Oracle SQL Developer?

select table_name from user_constraints where (r_constraint_name) in ( select constraint_name from user_constraints where table_name = ‘T’ and constraint_type in ( ‘P’, ‘U’ ) ); So, we can easily find all the constraints on the table in oracle using data dictionary views.

How do I remove a unique constraint in SQL Developer?

Drop Unique Constraint The syntax for dropping a unique constraint in Oracle is: ALTER TABLE table_name DROP CONSTRAINT constraint_name; table_name. The name of the table to modify.

How do you resolve unique constraint violation?

There are a few solutions to the “ORA-00001 unique constraint violated” error:

1. Change your SQL so that the unique constraint is not violated.
2. Change the constraint to allow for duplicate values.
3. Drop the constraint from the column.
4. Disable the unique constraint.

How do I find unique constraints in SQL?

Use sys. indexes, join the table, schema, object, and as an added bonus, you get not only unique constraints, but also unique indices, including filter.

What do you mean by unique constraint violation Support your answer with example?

A unique constraint violation occurs when an UPDATE or INSERT statement attempts to insert a record with a key that already exists in the table. Take a look at the package that is throwing the error. There are a few things that can cause this, including: 1) If the document(shipper, ASN, work order, etc.)

How do you handle unique constraint exceptions in PL SQL?

begin merge into some_table st using (select ‘some’ name, ‘values’ value from dual) v on (st.name=v.name) when matched then update set st. value=v. value when not matched then insert (name, value) values (v.name, v.