Psycopg2.errors.undefinedcolumn:

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The psycopg2.errors.undefinedcolumn error occurs when attempting to reference a column that does not exist in a table.

Here is an example to help understand the error: 

    
import psycopg2

# Establish a connection to the PostgreSQL database
conn = psycopg2.connect(database="your_database", user="your_user", password="your_password", host="your_host", port="your_port")

# Create a cursor object
cur = conn.cursor()

# Execute a SELECT statement with an undefined column
cur.execute("SELECT undefined_column FROM your_table")

# Fetch all rows from the result
rows = cur.fetchall()

# Close the cursor and the connection
cur.close()
conn.close()

In the above example, we attempt to execute a SELECT statement with a column named “undefined_column” that does not exist in the “your_table” table. This will result in the psycopg2.errors.undefinedcolumn error being raised.

To fix this error, you need to ensure that you are referencing valid column names in your SQL statements.

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