Let's say I have 100 rows in my table, with 3 columns of numbers. I don't need all the rows, only about half of them every time I fetch data. I only want the rows that have updated as getting the rest would be redundant.Let's say I have 100 rows in my table, with 3 c
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基本问题：查询数据和性能权衡
来源：互联网
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