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Unpivot with column name
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unpivot
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marks
for subject in (Maths, Science, English)
) u;
See SQL Fiddle with demo
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IN vs OR in the SQL WHERE Clause
...hen dealing with big databases, which performs better, IN or OR in the SQL Where -clause?
6 Answers
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How long should SQL email fields be? [duplicate]
...I don't see nvarchar anywhere... do I need to set that up manually with an SQL statement, or am I just missing it somewhere?
– Mala
Aug 19 '09 at 1:50
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Check if SQL Connection is Open or Closed
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You should be using SqlConnection.State
e.g,
using System.Data;
if (myConnection != null && myConnection.State == ConnectionState.Closed)
{
// do something
// ...
}
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What's the difference between NOT EXISTS vs. NOT IN vs. LEFT JOIN WHERE IS NULL?
It seems to me that you can do the same thing in a SQL query using either NOT EXISTS, NOT IN, or LEFT JOIN WHERE IS NULL. For example:
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xtreme toolkit pro——CXTPReportControl控件教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...各个单元格进行编辑，功能非常强大。下面介绍一下他的使用：
1. 在工程中头文件“stdafx.h”中添加：
#include <XTToolkitPro.h> // Xtreme Toolkit Pro component library
2. 如果要使用静态连接的方式，还应该：
Add the following line to your appl...
SQL, Postgres OIDs, What are they and why are they useful?
I am looking at some PostgreSQL table creation and I stumbled upon this:
4 Answers
4
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Entity Framework 4 vs NHibernate [closed]
...apping, better integration with stored procs / database functions / custom SQL / triggers, support for formula properties and so on. IMO it's basically just more mature as an ORM.
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sqlalchemy IS NOT NULL select
How can I add the filter as in SQL to select values that are NOT NULL from a certain column ?
3 Answers
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Using MySQL with Entity Framework [closed]
Can't find anything relevant about Entity Framework/MySQL on Google so I'm hoping someone knows about it.
10 Answers
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