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通信连接组件 · App Inventor 2 中文网
...ity方法启动一个Activity（活动）的组件。
可启动的Activity包括：
为 Android 应用启动另一个 App Inventor。 首先通过下载源代码并使用文件资源管理器或解压缩utility，找到一个名为“youngandroidproject/project.properties”的文件，找...
How to return only the Date from a SQL Server DateTime datatype
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On SQL Server 2008 and higher, you should CONVERT to date:
SELECT CONVERT(date, getdate())
On older versions, you can do the following:
SELECT DATEADD(dd, 0, DATEDIFF(dd, 0, @your_date))
for example
SELECT DATEADD(dd, 0, ...
sql primary key and index
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You are right, it's confusing that SQL Server allows you to create duplicate indexes on the same field(s). But the fact that you can create another doesn't indicate that the PK index doesn't also already exist.
The additional index does no good, but the only ...
'Microsoft.SqlServer.Types' version 10 or higher could not be found on Azure
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I found the solution ! Just install the nuget package Microsoft.SqlServer.Types
PM> Install-Package Microsoft.SqlServer.Types
Link for more info
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How do I create a parameterized SQL query? Why Should I?
I've heard that "everyone" is using parameterized SQL queries to protect against SQL injection attacks without having to vailidate every piece of user input.
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How to connect to SQL Server database from JavaScript in the browser?
Can anybody give me some sample source code showing how to connect to a SQL Server 2005 database from JavaScript locally? I am learning web programming on my desktop.
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In MySQL, can I copy one row to insert into the same table?
...you don't have to worry about the primary key. Setting it to null allows MySQL to choose the value itself, so there's no risk of creating a duplicate.
If you want to be super-sure you're only getting one row to insert, you could add LIMIT 1 to the end of the INSERT INTO line.
Note that I also appe...
DateTime format to SQL format using C#
...m trying to save the current date time format from C# and convert it to an SQL Server date format like so yyyy-MM-dd HH:mm:ss so I can use it for my UPDATE query.
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TSQL - Cast string to integer or return default value
Is there a way in T-SQL to cast an nvarchar to int and return a default value or NULL if the conversion fails?
8 Answers
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SQL Server - transactions roll back on error?
We have client app that is running some SQL on a SQL Server 2005 such as the following:
5 Answers
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