Question

正在查找如何编写CASE和COUNT个查询，该查询将显示日期为2017年1月2日至2017年4月19日期间的项目总销售天数。我正在接受“期待”这个词之间的预期。＆＃39; BETWEEN＆＃39;关键字。

表1：

ITEM    SALE    DATES
Apple   Yes   4/19/2017
Apple   Yes   2/18/2017
Apple   Yes   1/17/2017
Apple   no    3/16/2017
Apple   no    4/17/2017
Banana  Yes   4/19/2017
Banana  Yes   2/18/2017
Banana  Yes   1/17/2017
Banana  Yes   3/16/2017
Banana  no    4/17/2017

我在寻找：

ITEM    Total days on sale
Apple          2
Banana         3

当前查询：

SELECT
    ITEM,
    CASE WHEN SALE='YES' THEN COUNT(DATES BETWEEN '2/1/2017' AND '4/19/2017') END AS TOTAL_DAYS_ON_SALE_DAYS
FROM TABLE 1
GROUP BY 
    ITEM
ORDER BY 
    ITEM ASC

Answer 1

我认为你想要条件聚合：

SELECT ITEM,
       SUM(CASE WHEN SALE = 'YES' AND DATES BETWEEN DATE '2017-02-01' AND DATE '2017-04-19'
                THEN 1 ELSE 0
           END) AS TOTAL_DAYS_ON_SALE_DAYS
FROM TABLE 1
GROUP BY ITEM
ORDER BY ITEM ASC;

Answer 2

您可以将DATES上的检查移至WHERE子句并总结YES

<ul class="nav navbar-nav navbar-right">
@{
     AccountContactVM customer = (AccountContactVM)ViewBag.AccountData;
 }
 @if (customer.User == customer.User && customer.User != null )
 {
     <li class="dropdown">
         <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">
             <i class="fa fa-user-circle fa-fw fa-lg" aria-hidden="true"</i>
             @customer.User.FirstName @customer.User.LastName
             <span class="caret"></span>
         </a>
             <ul class="dropdown-menu" role="menu">
                 <li class="disabled">
                     <div class="row">
                         <div class="col-md-3">
                             <i class="fa fa-user-circle" style="font-size:40px;padding:5px 20px;" aria-hidden="true"></i>
                         </div>
                         <div class="col-md-9">
                             <p style="padding-top:5px;">
                                 @customer.User.FirstName @customer.User.LastName 
                             <br />
                                 @customer.Company.AccountName
                             </p>                   
                         </div>
                     </div>   
                 </li>
                 <li class="divider"></li>
                 <li><a asp-controller="Account" asp-action="Index">Customer Portal</a></li>
                 <li class="divider"></li>
                 <li><a a asp-controller="Account" asp-action="LogOut">Logout</a></li>
             </ul>
         </li>
     }
     else
     {
         <li><a asp-controller="Account" asp-action="SignUp">Register</a></li>
         <li><a asp-controller="Account" asp-action="SignIn"><i class="fa fa-sign-in fa-fw" aria-hidden="true"></i>Login</a></li>
     }
     <li ng-cloak><a href="@Url.Action("Index","Cart")"><span class="glyphicon glyphicon-shopping-cart"></span></i>Cart(<strong>{{CartCount}}</strong>)</a></li>
 </ul>

您的查询的问题是，COUNT（DATES）之类的东西可以使用，但不能使用BETWEEN或=等标准。

Teradata CASE和COUNT语法错误

2 个答案: