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                            ##  **創建一個復合索引**

> db.accountsWithIndex.createIndex(**{**name:1,balance:-1})
> 創建一個name值為正序 balance 為倒敘排列的索引 1為從小到大 -1為從大到下
> 
## **數據返回
## **
	{
		"v" : 2,
		"key" : {
			"_id" : 1
		},
		"name" : "_id_"
	},
	{
		"v" : 2,
		"key" : {
			"name" : 1
		},
		"name" : "name_1"
	},
	{
		"v" : 2,
		"key" : {
			"name" : 1,
			"balance" : -1
		},
		"name" : "name_1_balance_-1"
	}
]
}
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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