| index | age | name |
|---|---|---|
| 1 | 15 | BOB |
| 2 | 19 | ALICE |
| 3 | 20 | CHARLIE |
| index | age | name |
|---|---|---|
| 1 | 15 | Bob |
| 2 | 19 | Alice |
| 4 | 21 | John |
| index | age | name | name1 |
|---|---|---|---|
| 1 | 15 | BOB | Bob |
| 2 | 19 | ALICE | Alice |
| 3 | 20 | CHARLIE | null |
| index | age | name |
|---|---|---|
| 1 | 15 | BOB |
| 2 | 19 | ALICE |
| 3 | 20 | CHARLIE |
| index | age | name |
|---|---|---|
| 1 | 15 | Bob |
| 2 | 19 | Alice |
| 4 | 21 | John |
| index | age | name | index1 | age1 | name1 |
|---|---|---|---|---|---|
| 1 | 15 | BOB | 1 | 15 | Bob |
| 2 | 19 | ALICE | 2 | 19 | Alice |
| 3 | 20 | CHARLIE | null | null | null |