How to resolve error 1118 when deleting a column in MySQL?

When using the ALTER TABLE statement to delete a column, you may encounter MySQL error 1118. This error indicates that the column being deleted is referenced in a trigger, therefore it cannot be deleted.

To solve this problem, you can follow these steps:

1. Check triggers: First, use the following statement to find triggers that reference the deleted column:
2. Display triggers for the specified table.
3. Replace “table_name” with the name of the table that contains the deleted column.
4. Remove triggers: To delete triggers that use deleted columns, you can use the following statement.
5. Delete the trigger named trigger_name.
6. Replace “trigger_name” with the name of the trigger you want to delete. Repeat this step until all triggers referencing the deleted column have been removed.
7. Remove column: Lastly, use the ALTER TABLE statement to delete the column:
8. Remove a column named column_name from the table named table_name.
9. Replace “table_name” with the name of the table to be operated on, and replace “column_name” with the name of the column to be deleted.

Before deleting triggers or columns, make sure you have backed up important data and are fully aware of the impact of the changes made to the database structure.