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Finding row indem>x m> containing mam>x m>imum value using R
Given the following matrim>x m> lets assume I want to find the mam>x m>imum value in column two:
3 Answers
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rails 3 validation on uniqueness on multiple attributes
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validates :zipcode, :uniqueness => {:scope => :recorded_at}
For multiple attributes:
validates :zipcode, :uniqueness => {:scope => [:recorded_at, :something_else]}
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MySQL Select all columns from one table and some from another table
How do you select all the columns from one table and just some columns from another table using JOIN? In MySQL.
4 Answers
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How do you move a commit to the staging area in git?
If you want to move a commit to the staging area - that is uncommit it and move all of the changes which were in it into the staging area (effectively putting the branch in the state that it would have been in prior to the commit) - how do you do it? Or is it something that you can't do?
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MongoDB: How to query for records where field is null or not set?
I have an Email document which has a sent_at date field:
6 Answers
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Where does this come from: -*- coding: utf-8 -*-
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This way of specifying the encoding of a Python file comes from PEP 0263 - Defining Python Source Code Encodings.
It is also recognized by GNU Emacs (see Python Language Reference, 2.1.4 Encoding declarations), though I don't know if it was the first program to use that syntam>x m>.
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Create array of symbols
Is there a cleaner way to do something like this?
3 Answers
3
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Get TransactionScope to work with async / await
I'm trying to integrate async / await into our service bus.
I implemented a SingleThreadSynchronizationContem>x m>t based on this em>x m>ample http://blogs.msdn.com/b/pfm>x m>team/archive/2012/01/20/10259049.aspm>x m> .
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How does OpenID authentication work?
I am a little curious to know about how OpenID authentication works.
4 Answers
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How add “or” in switch statements?
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By stacking each switch case, you achieve the OR condition.
switch(myvar)
{
case 2:
case 5:
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break;
case 7:
case 12:
...
break;
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}
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