我有两张桌子。
<style>html { font-size: 14px; font-family: Arial, Helvetica, sans-serif; }
.k-input {
font-weight:bold !important;
font-size:12pt !important;
color: green !important;
}
::-webkit-input-placeholder {
color: green;
}
::-webkit-input-placeholder {
color: green;
font-weight: 800;
}
:-moz-placeholder { /* Firefox 18- */
color: green;
font-weight: 800;
}
::-moz-placeholder { /* Firefox 19+ */
color: green;
font-weight: 800;
}
:-ms-input-placeholder {
color: green;
font-weight: 800;
}
.container:hover{
background-color:#F0F2F3;
}
</style>
<link rel="stylesheet" href="//kendo.cdn.telerik.com/2016.2.607/styles/kendo.common-material.min.css" />
<link rel="stylesheet" href="//kendo.cdn.telerik.com/2016.2.607/styles/kendo.material.min.css" />
<link rel="stylesheet" href="//kendo.cdn.telerik.com/2016.2.607/styles/kendo.default.mobile.min.css" />
<script src="//kendo.cdn.telerik.com/2016.2.607/js/jquery.min.js"></script>
<script src="//kendo.cdn.telerik.com/2016.2.607/js/kendo.all.min.js"></script>
<div class="container" style="overflow: hidden;
border: 1px solid gray;
width: 465px;
margin-left: -180px;
padding: 30px 70px 30px 170px;">
<div id="example" role="application" style="float:left;width:49%; margin-right:2%;margin-left: -32%;">
<div id="select" class="demo-section k-content">
<select id="size" placeholder="Skills, Designations...." style="width: 230px;border-width: 2px !important; border-color: #D8D3D3 !important;" >
<option />
<option />to
<option />code
<option />way
<option />always
<option />easily
</select>
</div>
</div>
<div id="example1" role="application" style="float:left;width:49%;margin-right:0;margin-left: -5px;">
<div id="select" class="demo-section k-content">
<select id="size1" placeholder="Location" style="width: 140px;border-width: 2px !important; border-color: #D8D3D3 !important;" >
<option />
<option />Delhi
<option />Bangalore
<option />Jammu and kashmir
<option />ahmedabad
<option />Arunachal Pradesh
</select>
</div>
</div>
<div id="example2" role="application" style="
float: right;
margin-left: 95px;
width: 49%;
margin-right: 14px;
margin-top: -47px;">
<div id="select" class="demo-section k-content">
<select id="size2" placeholder="Exp(Years)" style="width: 114px;border-width: 2px !important; border-color: #D8D3D3 !important;
" >
<option />
<option />0 Year
<option />1
<option />2
<option />3
<option />4
</select>
</div>
</div>
<div id="example3" role="application" style="float:right;width:49%;margin-right:-102px;margin-top: -47px;">
<div id="select" class="demo-section k-content">
<select id="size3" placeholder="Salary" style="width: 100px;border-width: 2px !important; border-color: #D8D3D3 !important;
">
<option />
<option /><1 Lac
<option />2
<option />3
<option />4
</select>
</div>
</div>
</div>
<script>
$(document).ready(function() {
// create ComboBox from input HTML element
// create ComboBox from select HTML element
$("#size").kendoComboBox();
$("#size1").kendoComboBox();
$("#size2").kendoComboBox();
$("#size3").kendoComboBox();
var select = $("#size").data("kendoComboBox");
var select = $("#size1").data("kendoComboBox");
var select = $("#size2").data("kendoComboBox");
var select = $("#size3").data("kendoComboBox");
});
</script>
'Order details'
OrderID | Quantity | UnitPrice | ProductID
1002 | 19 | 17 | 824
1002 | 5 | 15 | 285
1003 | 7 | 6 | 543
1004 | 12 | 11 | 205
我必须得到购买了最多产品的客户的ID。正如您所看到的，一个客户不仅可以拥有一个OrderID
答案 0 :(得分：0)
我认为这样的事情应该可行：
SELECT TOP 1 customerid
FROM (
SELECT customerid, SUM(od.quantity) AS sum
FROM orders AS O
INNER JOIN order_details AS OD
ON O.orderid = OD.orderid
GROUP BY customerid
ORDER BY sum DESC)
检查表格名称
答案 1 :(得分：0)
您可以先根据SUM Quantity的降序汇总第一条记录的限制：
SELECT
ord.CustomerID,
SUM(det.Quantity) AS Quantity
FROM
Orders ord
JOIN
Order_Details det
ON (det.OrderID = ord.OrderID)
ORDER BY
Quantity DESC
LIMIT 1;