[ThaiNgocThanhDat] database-assignment-1#13
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unitoflazy wants to merge 1 commit into
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tpdongcs
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May 28, 2023
| enroll | ||
| ) e2 on e1.stud_id = e2.stud_id | ||
| where | ||
| e1.stud_id = 2 |
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because we know stud_id, why dont add it into the sub query ? so the number of rows need to be join can be reduced.
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