Psycopg2.errors.undefinedcolumn: column “none” does not exist

psycopg2.errors.undefinedcolumn: column “none” does not exist:

This error is raised when you are trying to access or manipulate a column in a database table that does not exist.

Let’s consider an example to understand this error better.

Imagine we have a table called “employees” with the following columns:

Now, let’s say you want to select the value of a column called “salary” from the “employees” table using psycopg2 in Python. However, the “salary” column does not exist.

import psycopg2

try:
    connection = psycopg2.connect(database="your_database", user="your_user", password="your_password", host="your_host", port="your_port")
    cursor = connection.cursor()
    
    cursor.execute("SELECT salary FROM employees")
    result = cursor.fetchall()
    
    print(result)

except psycopg2.Error as error:
    print("Error occurred:", error)
finally:
    if connection:
        cursor.close()
        connection.close()

When you run this code, you will get the error message: “psycopg2.errors.undefinedcolumn: column ‘salary’ does not exist”. This is because there is no “salary” column in the “employees” table.

To fix this error, you need to make sure that you are accessing columns that actually exist in the table. Check the spelling of the column name, and if necessary, modify your SQL query accordingly.