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SQL Server indexes - ascending or descending, what difference does it make?
When you create an index on a column or number of columns in MS SQL Server (I'm using version 2005), you can specify that the index on each column be either ascending or descending. I'm having a hard time understanding why this choice is even here. Using binary sort techniques, wouldn't a lookup be ...
Rest with Express.js nested router
Suppose I want to have REST endpoints which look roughly like this:
6 Answers
6
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How to handle many-to-many relationships in a RESTful API?
Imagine you have 2 entities, Player and Team , where players can be on multiple teams. In my data model, I have a table for each entity, and a join table to maintain the relationships. Hibernate is fine at handling this, but how might I expose this relationship in a RESTful API?
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PHP - find entry by object property from an array of objects
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You either iterate the array, searching for the particular record (ok in a one time only search) or build a hashmap using another associative array.
For the former, something like this
$item = null;
foreach($array as $struct) {
if ($v == $struct->ID) {...
Pandas percentage of total with groupby
This is obviously simple, but as a numpy newbe I'm getting stuck.
14 Answers
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Show dialog from fragment?
...user can choose a yes/no answer, and then the fragment should behave accordingly.
7 Answers
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How do I set the offset for ScrollSpy in Bootstrap?
I have a site with the navbar fixed on top and 3 divs underneath in the main content area.
12 Answers
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Remove Primary Key in MySQL
I have the following table schema which maps user_customers to permissions on a live MySQL database:
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Django ManyToMany filter()
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Just restating what Tomasz said.
There are many examples of FOO__in=... style filters in the many-to-many and many-to-one tests. Here is syntax for your specific problem:
users_in_1zone = User.objects.filter(zones__id=<id1>)
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How to use GROUP BY to concatenate strings in MySQL?
...doc/refman/5.0/en/group-by-functions.html#function_group-concat
From the link above, GROUP_CONCAT: This function returns a string result with the concatenated non-NULL values from a group. It returns NULL if there are no non-NULL values.
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