Question

我在我的数据库中维护股票价格，这是我的数据库结构

CREATE TABLE `sector_wise` (
  `symbol_name` varchar(50) DEFAULT NULL,
  `sector_name` varchar(50) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 ; 

CREATE TABLE `historical_data` (
  `symbol_name` varchar(70) DEFAULT NULL,
  `current_day` date DEFAULT NULL,
  `open_val` decimal(15,2) DEFAULT NULL,
  `high_val` decimal(15,2) DEFAULT NULL,
  `low_val` decimal(15,2) DEFAULT NULL,
  `close_val` decimal(15,2) DEFAULT NULL,
  `last_val` decimal(15,2) DEFAULT NULL,
  `prevclose_val` decimal(15,2) DEFAULT NULL,
  `volume` varchar(30) DEFAULT 'NA'
) ENGINE=MyISAM DEFAULT CHARSET=latin1 ;

插入脚本：

Insert INTO sector_wise ('symbol_name','sector_name') VALUES ('VISESHINFO','Agriculture');



Insert INTO historical_data ('symbol_name','current_day','open_val','high_val','low_val','close_val','last_val','prevclose_val','volume') VALUES ('VISESHINFO','2016-05-03',0.05,0.10,0.05,0.05,0.05,0.10,45814.95);

这是我试过的查询

SELECT sw.symbol_name AS symbol_name,
       hd.current_day AS curr_day,
       hd.open_val AS open_value,
       hd.high_val AS high_value,
       hd.low_val AS low_val,
       hd.close_val AS close_val,
       hd.prevclose_val AS prevclose_val,
       (close_val-prevclose_val)/close_val*100 AS per_change
FROM sector_wise sw,
     historical_data hd
WHERE sw.symbol_name = hd.symbol_name
  AND sw.sector_name = 'Agriculture'
  AND hd.current_day =
    (SELECT max(current_day)
     FROM historical_data)
ORDER BY per_change;

执行上述查询后得到的结果实际上是错误的，百分比chnage应该是-50.00而不是-100.00

symbol_name  curr_day       open_value   high_value low_value  close_val  prevclose_val percentage_change
VISESHINFO   2016-05-03       0.05           0.10          0.05           0.05         0.10                 -100.000000

请您告诉我计算百分比变化的错误究竟在哪里

Answer 1

（close_val-prevclose_val）/ close_val * 100将转换为以下内容：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width" />
<title>@ViewBag.Title</title>
<base href="/" />
@Styles.Render("~/Content/css")

<link rel="stylesheet" type="text/css" href="~/Content/lib/theme.css" />
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.1/css/font-awesome.min.css">
<link rel="stylesheet" type="text/css" href="~/Content/lib/primeui-ng-all.min.css" />

<!-- 1. Load libraries -->
@*@Scripts.Render("~/startup");*@
<!-- IE required polyfills, in this exact order -->
<script src="~/Scripts/lib/breeze-client/breeze.min.js"></script>
<script src="~/Scripts/lib/es6-shim/es6-shim.min.js"></script>
<script src="~/Scripts/lib/systemjs/dist/system-polyfills.js"></script>
<script src="~/Scripts/lib/shims_for_IE.js"></script>
<script src="~/Scripts/lib/angular2/bundles/angular2-polyfills.js"></script>
<script src="~/Scripts/lib/systemjs/dist/system.src.js"></script>
<script src="~/Scripts/lib/primeui/primeui-ng-all.min.js"></script>
<script src="~/Scripts/lib/rxjs/bundles/Rx.js"></script>
<script src="~/Scripts/lib/angular2/bundles/angular2.dev.js"></script>
<!-- 2. Configure SystemJS -->
<script>
    System.config({
        defaultJSExtensions: true,

        meta: {
            '*.js': { scriptLoad: true } //this allows TS debugging in VS
        },
        packages: {
            app: {
                format: 'register',
                defaultExtension: 'js'
            },

        },
        map: {
            'rxjs': 'scripts/lib/rxjs',
            'angular2': 'scripts/lib/angular2',
            'primeng': 'scripts/lib/primeng'
        }
    });
    System.import('app/main')
        .then(null, console.error.bind(console));
</script>





</head>
<body>

<div class="container body-content">
    @RenderBody()
</div>



@RenderSection("scripts", required: false)
</body>
</html>

等于-100。你确定公式吗？如果是价格变化，那么不应该在公式中使用prevclose_val作为分母吗？

Answer 2

我认为你只需要做（close_val / prev_close_val）* 100

Answer 3

拥有：收盘价= 0.05 Prev_close值= 0.10

 Delta = 1-close_value/prev_close

如何计算股票变动价值的变化

3 个答案: