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Are foreign keys really necessary in a database design?
...imary reason for FKs. (In fact in certain circumstances (More inserts than selects for example) maintaining a FK might be slower. )
– Robert
Mar 21 '10 at 17:28
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jQuery .live() vs .on() method for adding a click event after loading dynamic html
...er on a parent object (that does not get loaded dynamically) and give it a selector that matches your dynamic object like this:
$('#parent').on("click", "#child", function() {});
The event handler will be attached to the #parent object and anytime a click event bubbles up to it that originated on...
How to prevent ifelse() from turning Date objects into numeric objects
...documented option to have base::ifelse() preserve attributes based on user selection of which attributes to preserve. The request is here: https://bugs.r-project.org/bugzilla/show_bug.cgi?id=16609 - It has already been flagged as "WONTFIX" on the grounds that it has always been the way it is now, b...
How accurate is python's time.sleep()?
...ailable), and sleep() will
accept a time with a nonzero fraction
(Unix select is used to implement
this, where available).
And more specifically w.r.t. sleep():
Suspend execution for the given number
of seconds. The argument may be a
floating point number to indicate a
more precise...
How long do browsers cache HTTP 301s?
... 301, 307 etc.
You can open network panel in developer console in chrome. Select the network call. Right click on it and then click on Clear Browser Cache to remove the cached redirection.
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Using SQL Server 2008 and SQL Server 2005 and date time
...pen your EDMX in a file editor (or “open with…” in Visual Studio and select XML Editor). At the top you will find the storage model and it has an attribute ProviderManifestToken. This has should have the value 2008. Change that to 2005, recompile and everything works.
NOTE: You'll have to do ...
How to switch between hide and view password
...able (deprecated) or app:endIconDrawable then use custom drawable like <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/ic_eye_close" android:state_checked="true"/> <item android:drawable="@drawable/ic_eye_open"/> </selector...
Distinct() with lambda?
...teredList = originalList
.GroupBy(customer => customer.CustomerId)
.Select(group => group.First());
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No grammar constraints (DTD or XML schema) detected for the document
...checked and then do a manual validate by right-clicking on the project and selecting "Validate" for the warnings to go away. It seems that there is a bug in eclipse in which the validator gets messed up. You should be able to at least have the manual validation work even if you don't want it to ha...
JavaScript function to add X months to a date
...Good catch, tad. I'm surprised that I didn't see that. Note that the T-SQL select DATEADD (month , 1, '2011-10-31') yields '2011-11-30', which to me is reasonable. I got 10 up votes with a bad answer. Cool. :-)
– Chad
Nov 26 '11 at 3:53
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