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How to join (merge) data frames (inner, outer, left, right)
...s these operations in SQL.
library(sqldf)
## inner join
df3 <- sqldf("SELECT CustomerId, Product, State
FROM df1
JOIN df2 USING(CustomerID)")
## left join (substitute 'right' for right join)
df4 <- sqldf("SELECT CustomerId, Product, State
FROM df1...
PL/SQL, how to escape single quote in a string?
...a single quotation mark with two single >quotation marks in both sides.
SELECT 'test single quote''' from dual;
The output of the above statement would be:
test single quote'
Simply stating you require an additional single quote character to print a single quote >character. That is if you put ...
How can I change an element's text without changing its child elements?
...to_change.nodeValue = 'new text';
Of course, you can still use jQuery to select the <div> in the first place (i.e. var your_div = $('your_div').get(0);).
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Check if a string contains a substring in SQL Server 2005, using a stored procedure
...orce it within this test if you need it one way or the other. E.g. compare select CHARINDEX('ME' collate Latin1_General_CS_AS,'Home') and select CHARINDEX('ME' collate Latin1_General_CI_AS,'Home'). (In collations, CS stands for Case Sensitive and I'm sure you can work out CI).
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Sublime Text 2 - Link with Editor / Show file in sidebar
...
This is a useful answer, but the selected answer replicates the functionality of 'Eclipse's Link with Editor.' as requested in the question. i.e. reveal_in_side_bar the active file without the need to press a shortcut.
– serby
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Understanding keystore, certificates and alias
...d Application Package option of the Eclipse Android tool, you are asked to select a keystore first, and then asked to select a single alias/entry/pair from that keystore. After providing the passwords for both the keystore and the chosen alias, the app is signed and the public key (the certificate) ...
How to update maven repository in Eclipse?
...ou can right-click on your project then Maven > Update Project..., then select Force Update of Snapshots/Releases checkbox then click OK.
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How to install mongoDB on windows?
...d as an Administrator. For example, to move the folder to C:\mongodb:
Select Start Menu > All Programs > Accessories.
Right-click Command Prompt and select Run as Administrator from the popup menu.
Issue the following commands:
cd \
move C:\mongodb-win32-* C:\mongodb
...
Unique (non-repeating) random numbers in O(1)?
... max
At each iteration, a random number r is selected between 0 and max, array[r] and array[max] are swapped, the new array[max] is returned, and max is decremented:
max = 10, r = 3
+--------------------+
v v
+--+--+--+--+--+--+...
SQL multiple column ordering
... 1478
Thomas | Jefferson | 1826
If you execute the query below:
SELECT * FROM People ORDER BY FirstName DESC, YearOfBirth ASC
The result set will look like this:
FirstName | LastName | YearOfBirth
----------------------------------------
Thomas | More | 1478
Thomas ...