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                ## $sort * 將輸入文檔排序后輸出 * 例1:查詢學生信息,按年齡升序 ~~~ b.stu.aggregate([{$sort:{age:1}}]) ~~~ * 例2:查詢男生、女生人數,按人數降序 ~~~ db.stu.aggregate([ {$group:{_id:'$gender',counter:{$sum:1}}}, {$sort:{counter:-1}} ]) ~~~
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