刪除有`remove`和`deleteOne`、`deleteMany`，`remove`已過時但還能用。 <br/> **1. `deleteMany`** 刪除符合條件的所有文檔。 ```sql # 刪除price<6000的文檔 > db.goods.deleteMany({"price":{$lt:6000}}) { "acknowledged" : true, "deletedCount" : 8 } > db.goods.find() { "_id" : 1, "contry" : "中國" } { "_id" : 10, "name" : "apple10", "addr" : "蘋果旗艦店10", "contry" : "中國10", "price" : 6000 } { "_id" : 11, "name" : "apple11", "addr" : "蘋果旗艦店11", "contry" : "中國11", "price" : 6100 } { "_id" : 12, "name" : "apple12", "addr" : "蘋果旗艦店12", "contry" : "中國12", "price" : 6200 } ``` <br/> **2. `deleteOne`** 刪除符合條件的第一個文檔。 ```sql # 刪除price<6200的的第一個文檔 > db.goods.deleteOne({"price":{$lt:6200}}) { "acknowledged" : true, "deletedCount" : 1 } > db.goods.find() { "_id" : 1, "contry" : "中國" } { "_id" : 11, "name" : "apple11", "addr" : "蘋果旗艦店11", "contry" : "中國11", "price" : 6100 } { "_id" : 12, "name" : "apple12", "addr" : "蘋果旗艦店12", "contry" : "中國12", "price" : 6200 } { "_id" : 13, "name" : "apple13", "addr" : "蘋果旗艦店13", "contry" : "中國13", "price" : 6300 } ``` <br/> **3. 清空一個Collection** ```sql > db.goods.deleteMany({}) { "acknowledged" : true, "deletedCount" : 21 } > db.goods.find() ```