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| ID | Value | Date | Value |
|---|---|---|---|
| A | 150 | 20200620 | null |
| A | 130 | 20200621 | null |
| A | 140 | 20200622 | 150 |
| A | 200 | 20200623 | 130 |
| B | 300 | 20200622 | null |
| B | 350 | 20200623 | null |
| B | 400 | 20200624 | 300 |
| B | 150 | 20200625 | 350 |