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SQL Add foreign key to existing column

...sed an error trying to create the relationships to the other table. Thanks all. – ExceptionLimeCat Apr 30 '12 at 20:35 ...
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Objective-C declared @property attributes (nonatomic, copy, strong, weak)

... retaining the copy. Assign Assign is somewhat the opposite to copy. When calling the getter of an assign property, it returns a reference to the actual data. Typically you use this attribute when you have a property of primitive type (float, int, BOOL...) Retain retain is required when the attribut...
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Regular expression for letters, numbers and - _

... To actually cover your pattern, i.e, valid file names according to your rules, I think that you need a little more. Note this doesn't match legal file names from a system perspective. That would be system dependent and more libera...
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Understanding scala enumerations

...er Value representing the individual elements of the enumeration (it's actually an inner class, but the difference doesn't matter here). Thus object WeekDay inherits that type member. The line type WeekDay = Value is just a type alias. It is useful, because after you import it elsewhere with import...
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Django set default form values

...ch is explained here You have two options either populate the value when calling form constructor: form = JournalForm(initial={'tank': 123}) or set the value in the form definition: tank = forms.IntegerField(widget=forms.HiddenInput(), initial=123) ...
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Loop through properties in JavaScript object with Lodash

.../lodash.com/docs#forOwn Note that forOwn checks hasOwnProperty, as you usually need to do when looping over an object's properties. forIn does not do this check. share | improve this answer ...
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Use numpy array in shared memory for multiprocessing

... To add to @unutbu's (not available anymore) and @Henry Gomersall's answers. You could use shared_arr.get_lock() to synchronize access when needed: shared_arr = mp.Array(ctypes.c_double, N) # ... def f(i): # could be anything numpy accepts as an index such another numpy array with ...
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Update multiple rows in same query using PostgreSQL

... This is wrong... You will update all rows, even if it is not '123' nor '345'. You should use WHERE column_b IN ('123','456')... – MatheusOl Sep 14 '13 at 3:54 ...
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Adding git branch on the Bash command prompt

... git 1.9.3 or later: use __git_ps1 Git provides a shell script called git-prompt.sh, which includes a function __git_ps1 that prints text to add to bash PS1 prompt (includes branch name) Its most basic usage is: $ __git_ps1 (master) It also takes an optional format string: $ __g...
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awk without printing newline

... You might even want to set it "" (no space) to have no separation at all. – mschilli Aug 8 '13 at 13:11 9 ...