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How do I find duplicates across multiple columns?
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Duplicated id for pairs name and city:
select s.id, t.*
from [stuff] s
join (
select name, city, count(*) as qty
from [stuff]
group by name, city
having count(*) > 1
) t on s.name = t.name and s.city = t.city
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Ways to implement data versioning in MongoDB
...nt data versioning in MongoDB. (I've asked similar question regarding Cassandra . If you have any thoughts which db is better for that please share)
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LEFT OUTER JOIN in LINQ
...ay to do that with where clause?
Correct problem:
For inner join is easy and I have a solution like this
22 Answers
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Unable to copy ~/.ssh/id_rsa.pub
...ster wouldn't have been using Windows Subsystem for Linux. But if you are, and you get the same error, the following alternative works:
clip.exe < ~/.ssh/id_rsa.pub
Thanks to this page for pointing out Windows' clip.exe (and you have to type the ".exe") can be run from the bash shell.
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How do I get textual contents from BLOB in Oracle SQL
...ed to peek into the blob... But thanks anyway.
– Roland Tepp
May 7 '09 at 6:32
Thanks Mac, that works fine --- But wh...
Can vim monitor realtime changes to a file
...it in vim. I know I can read an opened file use tail -f sample.xml file, and when new content is written to the file, it'll also write the new content to my screen. Can I have vim automatically fill the new data when a file is updated?
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Soft keyboard open and close listener in an activity in Android
... set some other View 's visibility to Gone when the soft keyboard opens and also when the user clicks on the first EditText and also when the soft keyboard closes from the same EditText on the back button press. Then I want to set some other View 's visibility to visible.
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Places where JavaBeans are used?
What is a JavaBean and why do I need it? Since I can create all apps with the class and interface structure? Why do I need beans? And can you give me some examples where beans are essential instead of classes and interfaces?
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Rails select helper - Default selected value, how?
...g to edit your record.
You need to set the default to your existing value and then only set it to the actual default if you don't have a value. Like so:
f.select :field, options_for_select(value_array, f.object.field || default_value)
For anyone not familiar with f.object.field you always use f....
Is it a bad practice to use negative margins in Android?
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In 2010, @RomainGuy (core Android engineer) stated that negative margins had unspecified behavior.
In 2011, @RomainGuy stated that you can use negative margins on LinearLayout and RelativeLayout.
In 2016, @RomainGuy stated that they have never been ...