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What is the difference between “INNER JOIN” and “OUTER JOIN”?
...with a single column each, and data as follows:
A B
- -
1 3
2 4
3 5
4 6
Note that (1,2) are unique to A, (3,4) are common, and (5,6) are unique to B.
Inner join
An inner join using either of the equivalent queries gives the intersection of the two tables, i.e. the two rows the...
What's the best UI for entering date of birth? [closed]
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Get list of databases from SQL Server
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Mitch Wheat
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answered Sep 29 '08 at 5:51
Ben HoffsteinB...
vim line numbers - how to have them on by default?
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471
Add set number to your .vimrc file in your home directory.
If the .vimrc file is not in your h...
How can I see the size of files and directories in linux? [closed]
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564
Use ls command for files and du command for directories.
Checking File Sizes
ls -l filename ...
When should I use a struct instead of a class?
...Choosing Between Classes and Structures.
Basically, that page gives you a 4-item checklist and says to use a class unless your type meets all of the criteria.
Do not define a structure unless the
type has all of the following
characteristics:
It logically represents a single valu...
How to get nice formatting in the Rails console
...er it
was completely removed with the release of Ruby 2.0.0.
For rails 4/ruby 2 you could use just
puts object.to_yaml
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Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
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842
Use collections.Counter:
>>> from collections import Counter
>>> A = Counter...
SQL update fields of one table from fields of another one
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answered May 4 '10 at 15:41
Scott BaileyScott Bailey
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Is it possible to refresh a single UITableViewCell in a UITableView?
...ion:UITableViewRowAnimationNone];
[self.tableView endUpdates];
In Xcode 4.6 and higher:
[self.tableView beginUpdates];
[self.tableView reloadRowsAtIndexPaths:@[indexPathOfYourCell] withRowAnimation:UITableViewRowAnimationNone];
[self.tableView endUpdates];
You can set whatever your like as an...