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| date | price | ff_price |
|---|---|---|
| 2016-07-11 | 0.79 | 0.79 |
| 2016-07-12 | null | 0.79 |
| 2016-07-13 | null | 0.79 |
| 2016-07-14 | 0.69 | 0.69 |
| 2016-07-15 | null | 0.69 |
Warning: Null value is eliminated by an aggregate or other SET operation.