I've uninstalled the Commerce Coupon 7.x-2.0-beta3 through the admin ui and removed the corresponding folder from the sites/all/modules directory. Now when I install the previous version of Commerce Coupon 7.x-1.0-beta7 I get hit with the error.

```
DatabaseSchemaObjectExistsException:
 Table <em class="placeholder">commerce_coupon</em> already exists.

```

When I look at the Database in phpMyAdmin I see the the following references.

* commerce\_coupon
* commerce\_coupon\_type
* field\_data\_commerce\_coupon\_order\_reference
* field\_data\_commerce\_coupon\_reference
* field\_revision\_commerce\_coupon\_order\_reference
* field\_revision\_commerce\_coupon\_reference

I am not very familiar working with tables through SQL. Is there a basic procedure or query that is commonly used for deleting all references to a particular Drupal module?