| customer_id,name,email,phone | |
| 1,John Doe,john@example.com,555-1234 | |
| 2,Jane Smith,,555-5678 | |
| 3,Bob Johnson,bob@example.com, | |
| 4,Alice Brown,alice@example.com,555-9012 | |
| customer_id,name,email,phone | |
| 1,John Doe,john@example.com,555-1234 | |
| 2,Jane Smith,,555-5678 | |
| 3,Bob Johnson,bob@example.com, | |
| 4,Alice Brown,alice@example.com,555-9012 | |