MySQL 1072: Key column doesn't exist.

What is MySQL 1072: Key column doesn't exist.

When encountering the error "1072: Key column doesn't exist in table" in MySQL, the user should immediately take the following actions:

Identify the column and table mentioned in the error message. If the error message doesn't specify which table or column is causing the issue, refer to the SQL statement that triggered the error.

Verify if the column exists in the table by executing the following SQL command:

DESCRIBE `table_name`; Replace `table_name` with the name of the table you are working with. This command will list all columns in the table, allowing you to check if the specified column exists.

If the column does not exist, you'll need to either:

- Add the missing column to the table using the following SQL command if it was indeed supposed to exist:ALTER TABLE `tablename` ADD COLUMN `columnname` data_type; Replace `tablename` with the name of your table, `columnname` with the name of the missing column, and `data_type` with the appropriate SQL data type for the column. - Correct the SQL statement that caused the error by referring to the correct column name if the column name was misspelled or incorrect.4. If making changes to a production database, always ensure you have a recent backup before altering the database schema or data.