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What is the most efficient/elegant way to parse a flat table into a tree?
...lution is called Nested Sets, and it can be stored in the same table too. Read "Trees and Hierarchies in SQL for Smarties" by Joe Celko for a lot more information on these designs.
I usually prefer a design called Closure Table (aka "Adjacency Relation") for storing tree-structured data. It requi...
Difference between JOIN and INNER JOIN
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They are functionally equivalent, but INNER JOIN can be a bit clearer to read, especially if the query has other join types (i.e. LEFT or RIGHT or CROSS) included in it.
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How to make child process die after parent exits?
... This is a poor solution because the parent might have died already. Race condition. Correct solution: stackoverflow.com/a/17589555/412080
– Maxim Egorushkin
Dec 22 '15 at 17:49
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Git - How to fix “corrupted” interactive rebase?
...to file, so I created that file. Then I got another error saying could not read '.git/rebase-apply/onto': No such file or directory.
So I looked at the git documentation for rebasing and found another command:
git rebase --quit
This set me back on my branch with no changes, and I could start my ...
getResourceAsStream returns null
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I've already done all three of these things. Please reread my question.
– user1131435
May 15 '13 at 16:51
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How to pipe list of files returned by find command to cat to view all the files
...\;
(Everything between find and -exec are the find predicates you were already using. {} will substitute the particular file you found into the command (cat {} in this case); the \; is to end the -exec command.)
send output of one process as command line arguments to another process
command2 `co...
How do I analyze a .hprof file?
...ift thru a 400mb+ heap dump file, and it took jhat more than 70 minutes to read the file, before it caused a complete JVM crash. EMA is able to open it up in < 5 minutes.
– matt b
Jun 18 '09 at 18:37
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How do I return the response from an asynchronous call?
...modify it inside of a function? - Asynchronous code reference
→ If you already understand the problem, skip to the possible solutions below.
The problem
The A in Ajax stands for asynchronous . That means sending the request (or rather receiving the response) is taken out of the normal execution f...
Why should I not include cpp files and instead use a header?
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Good answer, sir. It was a fun read, and easy to understand. I wish my textbook was written like this.
– ialm
Nov 6 '09 at 19:08
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How to create a MySQL hierarchical recursive query
...here a condition is put to only include records for which the parent was already identified as being in the descendant tree (all descendants of the primary parent are progressively added to @pv).
The conditions in this where clause are evaluated in order, and the evaluation is interrupted once the t...