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What is PAGEIOLATCH_SH wait type in SQL Server?
...ppens in queries that use indexes efficiently.
If your query is like this:
Select * from <table> where <col1> = <value> order by <PrimaryKey>
, check that you have a composite index on (col1, col_primary_key).
If you don't have one, then you'll need either a full INDEX SCAN ...
A Better Django Admin ManyToMany Field Widget
...lt models.ManyToManyField widget to be cumbersome to use. It's the HTML select element and if you have a lot of Objects of the "other" model then it's quite impractical to actually find the "other" Objects you want to associate with "this" Object. And if you have a lot of objects of the "other...
How do I add an existing directory tree to a project in Visual Studio?
...x. After that, the added directory will be shown up. You will then need to select this directory, right click, and choose "Include in Project."
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android.widget.Switch - on/off event listener?
...bout you but I wish they named it OnCheckChangedListener, similar to OnItemSelectedListener, since On-Noun-Verb-Listener is an established naming convetion.
– Sam
Jul 1 '12 at 0:10
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What is the difference between a dialog being dismissed or canceled in Android?
...l() will normally be called when the user hits the back button rather than selecting the choices that alert dialog offers like OK/Dismiss and return null/no value to the caller. While
dialog.dismiss() is normally called when the user selects from the choices that alert dialog offers like hitting the...
difference between primary key and unique key
...ey, unique key, etc are collectively called as Candidate Key.
However, DBA selected a key from candidate key for searching records is called Primary key.
Difference between Primary Key and Unique key
1. Behavior: Primary Key is used to identify a row (record) in a table, whereas Unique-key is to...
Create a dictionary on a list with grouping
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into groupedDemoClass
select groupedDemoClass).ToDictionary(gdc => gdc.Key, gdc => gdc.ToList());
This one will work !!!
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Metadata file … could not be found error when building projects
...ound that if you right-click on your Solution in the Solution Explorer and select "Build Order" you can see the order that VS is using to rebuild your solution. It's likely out of whack.
You can correct the build order by clicking on the Dependencies tab and selecting the projects that depends on o...
How to organize a node app that uses sequelize?
... did not quite understand Sequelize, but to me doing things more than just selecting from one table wasn't really convenient. And where ordinarily you would use select from two or more tables, or a union in pure SQL, you would have to run separate queries, and with the async nature of Node it's just...
The Web Application Project […] is configured to use IIS. The Web server […] could not be found.
...to use IIS, simply go to your project properties, click the "Web" tab, and select the option to use IIS. There's the button there to "Create Virtual Directory". It may tell you that you need to run Visual Studio as an administrator to create that directory, so do that if needed.
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