+-----------------+
| Before deleting |
+-----------------+
| Before deleting |
+-----------------+
+-------------+---------------+------------------------+--------------+-------------+
| customer_id | name          | email                  | phone_number | signup_date |
+-------------+---------------+------------------------+--------------+-------------+
|           1 | John Doe      | john.doe@example.com   | 1234567890   | 2023-01-01  |
|           2 | Jane Smith    | jane.smith@example.com | 0987654321   | 2023-02-01  |
|           3 | John Doe      | john.doe@example.com   | 1234567890   | 2023-01-01  |
|           4 | Alice Brown   | alice.b@example.com    | 5678901234   | 2023-03-05  |
|           5 | Bob Johnson   | bob.j@example.com      | 6789012345   | 2023-04-10  |
|           6 | Charlie White | charlie.w@example.com  | 7890123456   | 2023-05-15  |
|           7 | Jane Smith    | jane.smith@example.com | 0987654321   | 2023-02-01  |
|           8 | David Green   | david.g@example.com    | 8901234567   | 2023-06-20  |
|           9 | Eve Black     | eve.b@example.com      | 9012345678   | 2023-07-25  |
|          10 | Frank Stone   | frank.s@example.com    | 0123456789   | 2023-08-30  |
+-------------+---------------+------------------------+--------------+-------------+
+----------------+
| After deleting |
+----------------+
| After deleting |
+----------------+
+-------------+---------------+------------------------+--------------+-------------+
| customer_id | name          | email                  | phone_number | signup_date |
+-------------+---------------+------------------------+--------------+-------------+
|           1 | John Doe      | john.doe@example.com   | 1234567890   | 2023-01-01  |
|           2 | Jane Smith    | jane.smith@example.com | 0987654321   | 2023-02-01  |
|           4 | Alice Brown   | alice.b@example.com    | 5678901234   | 2023-03-05  |
|           5 | Bob Johnson   | bob.j@example.com      | 6789012345   | 2023-04-10  |
|           6 | Charlie White | charlie.w@example.com  | 7890123456   | 2023-05-15  |
|           8 | David Green   | david.g@example.com    | 8901234567   | 2023-06-20  |
|           9 | Eve Black     | eve.b@example.com      | 9012345678   | 2023-07-25  |
|          10 | Frank Stone   | frank.s@example.com    | 0123456789   | 2023-08-30  |
+-------------+---------------+------------------------+--------------+-------------+