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Why do table names in SQL Server start with “dbo”?
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243
dbo is the default schema in SQL Server. You can create your own schemas to allow you to bett...
How can I disable editing cells in a WPF Datagrid?
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257
The WPF DataGrid has an IsReadOnly property that you can set to True to ensure that users cann...
Create unique constraint with null columns
..., menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_id, recipe_id) where menu_id IS NULL, effectively implementing the desired constraint.
Possible dra...
Is C++14 adding new keywords to C++?
...t explicit noexcept struct void
char32_t export nullptr switch volatile
class extern operator template wchar_t
const false private this ...
Run class in Jar file
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258
Use java -cp myjar.jar com.mypackage.myClass.
If the class is not in a package then simply j...
How do I set cell value to Date and apply default Excel date format?
I've been using Apache POI for some time to read existing Excel 2003 files programmatically. Now I have a new requirement to create entire .xls files in-memory (still using Apache POI) and then write them to a file at the end. The only problem standing in my way is the handling of cells with dates.
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How to alias 'git checkout' to 'git co'
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283
The command:
git config --global alias.co checkout
will create a git alias to do that. It w...
What is the logic behind the “using” keyword in C++?
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120
In C++11, the using keyword when used for type alias is identical to typedef.
7.1.3.2
A typede...
What is default session timeout in ASP.NET?
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It is 20 Minutes according to MSDN
From MSDN:
Optional TimeSpan attribute.
Specifies the number of minutes a session can be idle before it is abandoned. The timeout attribute cannot be set to a value that is greater than 525,601 m...
Which Boost features overlap with C++11?
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