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由 Noel Grandin 提交于
when we can satisfy a query from an index without touching table data, then that index should have a lower cost than an index that DOES need to retrieve table data
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最后提交
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| h2 |
when we can satisfy a query from an index without touching table data, then that index should have a lower cost than an index that DOES need to retrieve table data
| 名称 |
最后提交
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最后更新 |
|---|---|---|
| h2 |