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SQL Query to concatenate column values from multiple rows in Oracle
..., which works on versions prior to 11.2. Because WM_CONCAT is undocumented and unsupported by Oracle, it's recommended not to use it in production system.
With XMLAGG you can do the following:
SELECT XMLAGG(XMLELEMENT(E,ename||',')).EXTRACT('//text()') "Result"
FROM employee_names
What this doe...
Using numpad in Vi (Vim) via PuTTY
...e using vi [Cialug]:
In the configuration, go to Terminal->Features and check "Disable
application keypad mode". Save the settings and enjoy a numeric pad
that works!
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Find unique rows in numpy.array
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+1 This is clear, short and pythonic. Unless speed is a real issue, these type of solutions should take preference over the complex, higher voted answers to this question IMO.
– Bill Cheatham
Apr 30 '14 at 13:3...
How can I change the color of a Google Maps marker?
...Google Maps API to build a map full of markers, but I want one marker to stand out from the others. The simplest thing to do, I think, would be to change the color of the marker to blue, instead of red. Is this a simple thing to do or do I have to create a whole new icon somehow? If I do have to cre...
Change from SQLite to PostgreSQL in a fresh Rails project
I have a rails app that's databases are in SQLite (The dev and production). Since I am moving to heroku, I want to convert my database to PostgreSQL.
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Spring @PropertySource using YAML
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@Jan Galinski you can try my answer,it`s easy to use,and it works well on my prod env.stackoverflow.com/questions/21271468/…
– Forest10
Dec 4 '19 at 3:54
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Why would one declare a Java interface method as abstract?
...va Language Specification, the abstract keyword for interfaces is obsolete and should no longer be used. (Section 9.1.1.1)
That said, with Java's propensity for backwards compatibility, I really doubt it will ever make a difference whether the abstract keyword is present.
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How do I search within an array of hashes by hash values in ruby?
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Oh! You were the first one! Deleting my answer and +1.
– Milan Novota
Feb 11 '10 at 14:13
22
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How do I set environment variables from Java?
...s to start, though, so I'd rather modify the current process's environment and let the subprocesses inherit it.
19 Answers
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How can I remove the string “\n” from within a Ruby string?
...quote marks behave differently.
Double quotes " allow character expansion and expression interpolation ie. they let you use escaped control chars like \n to represent their true value, in this case, newline, and allow the use of #{expression} so you can weave variables and, well, pretty much any ru...