Question

我有一个像这样的mysql数据库：

PropertyBase<A>

我知道如何获得1月，2月的总和......

   ID | date | value
   1 | 2017-02-20 | 200
   2 | 2017-02-17 | 400
   3 | 2017-02-15 | 630
   4 | 2017-01-28 | 110
   5 | 2017-01-29 | 220

但现在我需要一个代码来获得1月和2月的平均值。

我试过

SELECT SUM(value) AS wert 
FROM table  
WHERE YEAR(date) = YEAR(CURRENT_DATE - INTERVAL 2 MONTH) 
  AND MONTH(date) = MONTH(CURRENT_DATE - INTERVAL 2 MONTH)

但这不起作用。

感谢您的帮助！

Answer 1

override func viewDidLoad() {
    super.viewDidLoad()
    FirstName.delegate = self
    LastName.delegate = self
    FirstName.addTarget(self, action:"edited", for:UIControlEvents.allEditingEvents)
    LastName.addTarget(self, action:"edited", for:UIControlEvents.allEditingEvents)
    // Do any additional setup after loading the view.
    if FirstName.text?.isEmpty == true || LastName.text == "" {
        ProgressButton.setImage(UIImage(named: "Skip"), for: .normal)
        ProgressButton.contentEdgeInsets = UIEdgeInsetsMake(0,0,0,0)
        ProgressButton.addTarget(self, action: #selector(Skip(_sender:)), for: UIControlEvents.touchUpInside)
    } else {
        ProgressButton.setImage(UIImage(named: "Right2"), for: .normal)
        ProgressButton.contentEdgeInsets = UIEdgeInsetsMake(20,31,24,0)
        ProgressButton.addTarget(self, action: #selector(Continue(_sender:)), for: UIControlEvents.touchUpInside)
    }
}

func edited() {
    if FirstName.text?.isEmpty == true || LastName.text == "" {
        ProgressButton.setImage(UIImage(named: "Skip"), for: .normal)
        ProgressButton.contentEdgeInsets = UIEdgeInsetsMake(0,0,0,0)
        ProgressButton.addTarget(self, action: #selector(Skip(_sender:)), for: UIControlEvents.touchUpInside)
    } else {
        ProgressButton.setImage(UIImage(named: "Right2"), for: .normal)
        ProgressButton.contentEdgeInsets = UIEdgeInsetsMake(20,31,24,0)
        ProgressButton.addTarget(self, action: #selector(Continue(_sender:)), for: UIControlEvents.touchUpInside)
    }
}

func Continue(_sender: ABProgressButton!) {
    FirstName.resignFirstResponder()
    LastName.resignFirstResponder()
        // Delay the dismissal by 5 seconds
        let delay = 0.85 * Double(NSEC_PER_SEC)
        var time = DispatchTime.now() + Double(Int64(delay)) / Double(NSEC_PER_SEC)
        DispatchQueue.main.asyncAfter(deadline: time, execute: {

            self.performSegue(withIdentifier: "ToViewController#2", sender: nil)

        })

}

func Skip(_sender: ABProgressButton!) {
    FirstName.resignFirstResponder()
    LastName.resignFirstResponder()
    self.performSegue(withIdentifier: "ToViewController#2", sender: nil)
}

特定时间内mysql记录的平均值

1 个答案: