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| id | dummy | clmX |
|---|---|---|
| 1 | a | 1 |
| 2 | b | 2 |
| 3 | c | 3 |
| 4 | d | null |
| 5 | e | null |
| id | name |
|---|---|
| 1 | c1 |
| 2 | c2 |
| 3 | c3 |
| 4 | c4 |
| id | dummy | clmX |
|---|---|---|
| 1 | a | 1 |
| 2 | b | 2 |
| 3 | c | 3 |
| 4 | d | null |
| 5 | e | null |
| id | name |
|---|---|
| 1 | c1 |
| 2 | c2 |
| 3 | c3 |
| 4 | c4 |