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Accessing bash command line args $@ vs $*
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Which version is more suitable for a "wrapper" script, where the scripts parameters need to become parameters to a new command?
– Segfault
Mar 30 '15 at 15:53
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Is it possible to GROUP BY multiple columns using MySQL?
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Yes, you can group by multiple columns. For example,
SELECT * FROM table
GROUP BY col1, col2
The results will first be grouped by col1, then by col2. In MySQL, column preference goes from left to right.
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What does the line “#!/bin/sh” mean in a UNIX shell script?
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When you try to execute a program in unix (one with the executable bit set), the operating system will look at the first few bytes of the file. These form the so-called "magic number", which can be used to decide the format of the program and how to execute it.
#! corresponds to the ...
Are Javascript arrays sparse?
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Yes, they are. They are actually hash tables internally, so you can use not only large integers but also strings, floats, or other objects. All keys get converted to strings via toString() before being added to the hash. You can confirm this with some test code:
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Difference between filter and filter_by in SQLAlchemy
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These code examples are misleading: Declarative base table classes and instances have neither filter nor query methods; they use the session.
– Turtles Are Cute
Mar 16 '16 at 19:45
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Explicitly set Id with Doctrine when using “AUTO” strategy
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In case the entity is part of a class table inheritance you need to change the id-generator in the class metadata for both entities (the entity you are persisting and the root entity)
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Rails extending ActiveRecord::Base
...like this idea because is a standard way of doing it but... I get an error Table 'moboolo_development.abstract_models' doesn't exist: SHOW FIELDS FROM abstract_models. Where should I put it?
– xpepermint
Feb 25 '10 at 7:59
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What exactly does a jar file contain?
...by the application.
Class files contain compiled Java code, which is executable by the Java Virtual Machine.
http://en.wikipedia.org/wiki/Java_class_file
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Virtual member call in a constructor
...y are constructed, but start out as the most derived type, with the method table being for the most derived type. This means that virtual method calls always run on the most derived type.
When you combine these two facts you are left with the problem that if you make a virtual method call in a cons...
Uses of Action delegate in C# [closed]
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Great, I think this could be used as a decision table.
– Biswanath
Dec 16 '08 at 12:22
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