Column specified more than once

PostgreSQL column specified more than once

Column specified more than once

Duplicate column

The cause of error: Column specified more than once.
The solution is to remove duplicate columns.

Wrong insert

INSERT INTO test.students (id, first_name, first_name) 
VALUES (6, 'Paul', 'Paul');

ERROR: column "first_name" specified more than once
LINE 1: INSERT INTO test.students (id, first_name, first_name) VALUE...

Query returned successfully in 430 msec.

Correct query

INSERT INTO test.students (id, first_name) 
VALUES (6, 'Paul');

INSERT 0 1

Query returned successfully in 393 msec.