Data view operation types
| ID | Data view operation | Function description |
|---|---|---|
| 1 | Select tuples from data view of ADS according to the condition | |
| 2 | Joint data views of ADS1 and ADS2 according to the condition | |
| 3 | ∏fields(ADS) | Project specified fields from data view of ADS. |
| 4 | ADS1∩ADS2 | Union data views of ADS1 and ADS2 |
| 5 | ADS1∪ADS2 | Intersect data views of ADS1 and ADS2 |
| 6 | ADS1−ADS2 | Data view of ADS1 minus data view of ADS2 |
| ID | Data view operation | Function description |
|---|---|---|
| 1 | Select tuples from data view of ADS according to the condition | |
| 2 | Joint data views of ADS1 and ADS2 according to the condition | |
| 3 | ∏fields(ADS) | Project specified fields from data view of ADS. |
| 4 | ADS1∩ADS2 | Union data views of ADS1 and ADS2 |
| 5 | ADS1∪ADS2 | Intersect data views of ADS1 and ADS2 |
| 6 | ADS1−ADS2 | Data view of ADS1 minus data view of ADS2 |
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