我回来了另一个问题.我现在一直在修补这个1天半,但仍然没有运气.所以我有下表.
Table1
Field1 Field2 Field3 Field4 Field5
DR1 500 ID1 Active TR1
DR2 250 ID2 Active TR1
DR3 100 ID1 Active TR1
DR4 50 ID3 Active TR1
DR5 50 ID1 Cancelled TR1
DR6 150 ID1 Active TR2
Table2
Field1 Field3
ID1 Chris
ID2 John
ID3 Jane
Table3
Field1 Field2
TR1 Shipped
TR2 Pending
我目前可以实现这个结果.
Name Total
Chris 650 3
John 250 1
Jane 50 1
使用这个sql语句
SELECT t2.Field3 as Name , SUM(t1.Field2) as Total
FROM [Table1] t1 INNER JOIN [Table2] …SQL Developer 中 EXPLAIN PLAN 和 AUTOTRACE 之间的基本区别是什么。有人可以详细说明吗？
这是我试图找出 Autotrace 和 Explain Plan 之间差异的查询。
SELECT name, address, latest_in
FROM ( SELECT name, address, latest_in
ROW_NUMBER() OVER (PARTITION BY name ORDER BY address DESC) AS rowrank
FROM avrajit
)
WHERE rowrank <> 1 AND rowrank > 3;
我在DataAcess类中有以下函数,但它没有显示任何结果.
我的代码如下:
public List<Products> GetProduct(string productName)
{
System.Data.DataSet ds = null;
db = DBWrapper.GetSqlClientWrapper();
db.ClearParameters();
db.AddParameter(db.MakeInParam("@ProductName", DbType.String, 30, productName));
string query = @"SELECT ProductId
FROM [Products]
WHERE Name LIKE '%@ProductName%'";
ds = db.GetDataSet(query);
db.ClearParameters();
// Rest of Code
}
我也尝试过:
string query = @"SELECT ProductId
FROM [Products]
WHERE Name LIKE '%"+"@ProductName"+"%'";
但它运行良好,没有参数化,如:
string query = @"SELECT ProductId
FROM [Products]
WHERE Name LIKE '%"+productName+"%'";
如何使用@ProductName参数化编写这个???
当我复制并粘贴以下代码时,我正在web.config从此处实现文件:
<configSections>
<section name ="ProductSection" type ="<ProductSection" />
</configSections>
<ProductSection>
<gridSettings title ="Latest Products" count ="20"></gridSettings>
<color background="FFFFCC" foreground="FFFFFF"></color>
</ProductSection>
我有几个错误,如:
</section> 不见了. 'section'不能包含子元素.如何删除这些错误并顺利运行它.
在jQuery中理解链接概念很简单但是在jQuery中链接后并没有给出期望的结果.为什么它会在按钮点击时使字体颜色变为蓝色而不是红色然后是蓝色(链式)？
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
// The following code should make the text-color as red
// and then perform the other chaining function,
// but its not making it red, instead it makes it blue on button click.
$("#p1").css("color", "red")
.slideUp(2000)
.slideDown(2000)
.css("color", "blue")
.slideUp(2000)
.slideDown(2000);
});
});
</script>
</head>
<body>
<p id="p1">jQuery is fun!!</p>
<button>Click me</button>
</body>
</html>
上面的jQuery代码应该使文本颜色变为红色,然后执行另一个链接功能,但它不会使其变为红色,而是在按钮点击时使其变为蓝色.