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MySQL indexes - what are the best practices?
...e these from left to right. So if you have:
Table A
Id
Name
Category
Age
Description
if you have a compound index that includes Name/Category/Age in that order, these WHERE clauses would use the index:
WHERE Name='Eric' and Category='A'
WHERE Name='Eric' and Category='A' and Age > 18
but ...
Git: Find the most recent common ancestor of two branches
... @ThorbjørnRavnAndersen, yes, I suppose that's so... The difficulty in description comes with the fact that git uses a Directed Acyclic Graph, and yet it's often thought of as a tree, which it technically is not. To be more careful in my wording, I was talking about the case where you want the ...
Why is 'false' used after this simple addEventListener function?
...ould be explaining the event propagation.
What I'm trying to do based this description schema is :
Following event flow down and up the following hierarchy :
<window>
<document>
<body>
<section>
<div>
<paragraph>
<span>
For the sake of simplicity we'll st...
How can I save an image to the camera roll?
...
From iOS10 on, using NSPhotoLibraryUsageDescription key in plist is mandatory. Otherwhise the app crashes.
– ASLLOP
Jan 26 '17 at 10:48
...
How can I see all the issues I'm watching on Github?
.../issues/#parameters
GET /orgs/:org/issues
Parameters
Name Type Description
filter string Indicates which sorts of issues to return. Can be one of:
* assigned: Issues assigned to you
* created: Issues created by you
* mentioned: Issues mentioning you
* subscribed: Issues you're subscrib...
Popstate on page's load in Chrome
...
window.history.ready = true;
history.pushState(state, null, 'content.php?id='+ nextPageId);
// ajax in content instead of loading server-side
}
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What is the difference between up-casting and down-casting with respect to class variable
...w users of this question.
Please read this article where contains complete description on upcasting, downcasting and use of instanceof operator
There's no need to upcast manually, it happens on its own:
Mammal m = (Mammal)new Cat(); equals to Mammal m = new Cat();
But downcasting must always be...
Update one MySQL table with values from another
...ster than the JOIN syntax. About 10.000 rows.
– Alex2php
Aug 22 '17 at 13:44
1
They key ingredien...
Send POST request using NSURLSession
...
its a php server do you have any reference related to Postman ?
– tryKuldeepTanwar
Jul 28 '16 at 10:22
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Which Java Collection should I use?
...ndex, you access them by their key, which is any object. Like the array in PHP :)
Data in Map are searchable by their key.
Typical operation: get an element by its ID (where ID is of any type, not only int as in case of List).
The differences
Set vs. Map: in Set you search data by themselves, whi...