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Tricky Google interview question
...st preserve duplicates coming from both its input sequences. See Data.List.Ordered package for related stuff.
– Will Ness
Apr 16 '12 at 15:37
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sql “LIKE” equivalent in django query
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In order to preserve the order of the words as in the sql LIKE '%pattern%' statement I use iregex, for example:
qs = table.objects.filter(string__iregex=pattern.replace(' ', '.*'))
string methods are immutable so your pattern...
Tying in to Django Admin's Model History
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logs = LogEntry.objects.exclude(change_message="No fields changed.").order_by('-action_time')[:20]
logCount = LogEntry.objects.exclude(change_message="No fields changed.").order_by('-action_time')[:20].count()
return render(request, template, {"logs":logs, "logCount":logCount})
As s...
Migration: Cannot add foreign key constraint
...ed as a primary key in it's original table. Migrations get executed in the order they were created as indicated by the file name generated after running migrate:make. E.g. 2014_05_10_165709_create_student_table.php.
The solution was to rename the file with the foreign key to an earlier time than th...
Where can I find the “clamp” function in .NET?
...er that with double and float, the CompareTo method corresponds to a total order where NaN is less than all other values, including NegativeInfinity. So it is not equivalent to the < operator. If you used < with a floating-point type, you would have to consider how to treat NaN also. This is n...
How do I add more members to my ENUM-type column in MySQL?
...o the end is fine, since you just add meaning old values. but changing the order / removing enums will make those numbers undefined. (eg. 1=>italy, 2=>germany), then extending will be (1=>italy, 2=>germany, 3=>sweenden).
– lintabá
Mar 21 '19 at ...
How to add a progress bar to a shell script?
...ash use their own built-in echo command that doesn't accept "-n" ... so in order to accomplish the same thing you need to put \r\c at the end of the string, instead of just \r
– Justin Jenkins
Apr 2 '12 at 1:17
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Can someone explain in simple terms to me what a directed acyclic graph is?
...Hence B depends on A or in better terms A has an edge directed to B. So in order to reach Node B you have to visit Node A. It will soon be clear that after adding all the subjects with its pre-requisites into a graph, it will turn out to be a Directed Acyclic Graph.
If there was a cycle then yo...
Memcached vs. Redis? [closed]
... can happen if you serialize stale data).
Lists (commands)
Redis lists are ordered collections of strings. They are optimized for inserting, reading, or removing values from the top or bottom (aka: left or right) of the list.
Redis provides many commands for leveraging lists, including commands to p...
Are duplicate keys allowed in the definition of binary search trees?
...ng to figure out why my red/black trees would occasionally traverse out of order, the problem was what I described above. Hopefully somebody reads this and saves themselves hours of debugging in the future!
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