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relational algebra gist for test
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| group: R1 R2 | |
| description[[ casual test | |
| ]] | |
| R1 = { A B | |
| 1 2 | |
| 3 4 | |
| } | |
| R2 = { C D | |
| 3 4 | |
| 5 6 | |
| } |
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