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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...
How to read the value of a private field from a different class in Java?
...e a poorly designed class in a 3rd-party JAR and I need to access one of its private fields. For example,
why should I need to choose private field is it necessary?
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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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SQLite UPSERT / UPDATE OR INSERT
I need to perform UPSERT / INSERT OR UPDATE against a SQLite Database.
7 Answers
7
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AngularJS : Initialize service with asynchronous data
I have an AngularJS service that I want to initialize with some asynchronous data. Something like this:
10 Answers
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What characters are forbidden in Windows and Linux directory names?
... of forbidden filename characters is not going to work on Windows because it reserves filenames as well as characters. Yes, characters like
* " ? and others are forbidden, but there are a infinite number of names composed only of valid characters that are forbidden. For example, spaces and dots are ...
Make sure that the controller has a parameterless public constructor error
...ial which has worked great, until I modified my DbContext to have an additional constructor. I am now having issues with the resolution and not sure what to do to fix this. Is there an easy way to force it to grab the parameterless constructor or I am approaching this incorrectly?
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how to remove css property using javascript?
is it possible to remove a CSS property of an element using JavaScript ?
e.g. I have div.style.zoom = 1.2 ,
now i want to remove the zoom property through JavaScript ?
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Add .gitignore to gitignore
Is it possible to add the .gitignore file to .gitignore itself?
6 Answers
6
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