Mongodb 如何在mongoose中查询多个表的结果?
我有两张桌子Mongodb 如何在mongoose中查询多个表的结果?,mongodb,express,mongoose,Mongodb,Express,Mongoose,我有两张桌子 let SalesItemsSchema = new Schema({ name: {type: String, required: true}, quantity : {type:Number , required:true}, sale_id: {type: String, required: true}, amount : {type:Number , required:true}, purchase_amount : {type:Nu
let SalesItemsSchema = new Schema({
name: {type: String, required: true},
quantity : {type:Number , required:true},
sale_id: {type: String, required: true},
amount : {type:Number , required:true},
purchase_amount : {type:Number , required:true},
} , {timestamps : true});
let InventorySchema = new Schema({
name: {type: String, required: true, max: 100},
quantity: {type: Number, required: true},
} , {timestamps:true});
我想得到库存中的剩余物品。例如,100件物品被添加到库存中,其中90件被售出。
我想从两张表中得到10的差值
我在用猫鼬