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MySQL - SELECT WHERE field IN (subquery) - Extremely slow why?
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Rewrite the query into this
SELECT st1.*, st2.relevant_field FROM sometable st1
INNER JOIN sometable st2 ON (st1.relevant_field = st2.relevant_field)
GROUP BY st1.id /* list a unique sometable field here*/
HAVING COUNT(*) > ...
What does (x ^ 0x1) != 0 mean?
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The XOR operation (x ^ 0x1) inverts bit 0. So the expression effectively means: if bit 0 of x is 0, or any other bit of x is 1, then the expression is true.
Conversely the expression is false if x == 1.
So the test is the same as:
if (x != 1)
and is therefo...
Which HTTP methods match up to which CRUD methods?
...yle programming, we should use HTTP methods as our building blocks. I'm a little confused though which methods match up to the classic CRUD methods. GET/Read and DELETE/Delete are obvious enough.
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Why is lazy evaluation useful?
... I have yet to have anyone explain to me in a way that makes sense; mostly it ends up boiling down to "trust me".
22 Answer...
Add .gitignore to gitignore
Is it possible to add the .gitignore file to .gitignore itself?
6 Answers
6
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Git for beginners: The definitive practical guide
... seeing this post by PJ Hyett , I have decided to skip to the end and go with Git .
37 Answers
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Non greedy (reluctant) regex matching in sed?
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Neither basic nor extended Posix/GNU regex recognizes the non-greedy quantifier; you need a later regex. Fortunately, Perl regex for this context is pretty easy to get:
perl -pe 's|(http://.*?/).*|\1|'
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How can I access Google Sheet spreadsheets only with Javascript?
...oogle spreadsheet data (if they are published) via the JSON api:
https://github.com/mikeymckay/google-spreadsheet-javascript
You can see it in action here:
http://mikeymckay.github.com/google-spreadsheet-javascript/sample.html
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Passing enum or object through an intent (the best solution)
I have an activity that when started needs access to two different ArrayLists. Both Lists are different Objects I have created myself.
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What is a race condition?
When writing multithreaded applications, one of the most common problems experienced is race conditions.
18 Answers
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