Created
April 9, 2018 17:05
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Question sql.
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| GOOD: The following is OK because ID is not used twice in the same SITE | |
| ID SITE | |
| A 1 | |
| B 1 | |
| C 1 | |
| A 2 | |
| B 2 | |
| C 2 | |
| BAD: This is bad because ID B is used twice in the same SITE. | |
| ID SITE | |
| A 1 | |
| B 1 | |
| B 1 | |
| A 2 | |
| B 2 | |
| C 2 |
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