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要取出数据库中按某字段排序后的前10,20,30条数据要怎么做?表中这样的字段有很多。因为有多个排行榜。比如有totalClickNum,monthClickNum,weekClickNum等。对数据库操作不是很懂。具体要怎么做才能使得性能比较高呢?
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function getSql(sortFields, num) { return "select * from 表 ORDER BY " + sortFields + " DESC LIMIT " + num; }
Use limit
SELECT field 1, field 2, field 3 FROM table ORDER BY sort field DESC LIMIT 10
Use limit
SELECT field 1, field 2, field 3 FROM table ORDER BY sort field DESC LIMIT 10