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                # unwind 將文檔中的某一個數組類型字段拆分成多條,每條包含數組中的一個值。 ~~~ { "_id" : 1, "item" : "ABC1", sizes: [ "S", "M", "L"] } ~~~ 使用: ~~~ db.inventory.aggregate( [ { $unwind : "$sizes" } ] ) ~~~ 返回結果: ~~~ { "_id" : 1, "item" : "ABC1", "sizes" : "S" } { "_id" : 1, "item" : "ABC1", "sizes" : "M" } { "_id" : 1, "item" : "ABC1", "sizes" : "L" } ~~~
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