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Postgresql GROUP_CONCAT equivalent?
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edited Sep 14 '17 at 20:37
Ariel Allon
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What is a Question Mark “?” and Colon “:” Operator Used for? [duplicate]
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edited Jun 20 at 9:12
Community♦
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answered Apr 26 '12 at 15:49
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Removing elements by class name?
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edited Aug 19 '14 at 9:20
answered Dec 28 '12 at 8:07
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How to hash some string with sha256 in Java?
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answered Aug 20 '13 at 16:25
JonathanJonathan
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Docker - a way to give access to a host USB or serial device?
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There are a couple of options. You can use the --device flag that use can use to access USB de...
What is the iPad user agent?
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alex
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answered Feb 11 '10 at 22:56
njynjy
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Nested function in C
... nested functions.
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Dec 20 '16 at 14:54
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Resizing an Image without losing any quality [closed]
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answered Sep 17 '08 at 21:20
Kris EricksonKris Erickson
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What is the most efficient/elegant way to parse a flat table into a tree?
...rsive queries in MySQL 8.0 in my presentation Recursive Query Throwdown in 2017.
Below is my original answer from 2008:
There are several ways to store tree-structured data in a relational database. What you show in your example uses two methods:
Adjacency List (the "parent" column) and
Pa...
Genymotion, “Unable to load VirtualBox engine.” on Mavericks. VBox is setup correctly
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Closest thing I can find on El Capitan with VBox 4.3.20 is sudo /Library/Application\ Support/VirtualBox/LaunchDaemons/VirtualBoxStartup.sh restart, which returns among other things the error: /Library/Application Support/VirtualBox/VBoxDrv.kext failed to load - (libkern/kext) ...