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When do we need curly braces around shell variables?
...assigned without $ and without {}. You have to use
var=10
to assign. In order to read from the variable (in other words, 'expand' the variable), you must use $.
$var # use the variable
${var} # same as above
${var}bar # expand var, and append "bar" too
$varbar # same as ${varbar}, i.e ...
Return rows in random order [duplicate]
Is it possible to write SQL query that returns table rows in random order every time the query run?
6 Answers
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Spring Boot: How can I set the logging level with application.properties?
...re logs in the external file.
These are different logging levels and its order from minimum << maximum.
OFF << FATAL << ERROR << WARN << INFO << DEBUG << TRACE << ALL
# To set logs level as per your need.
logging.level.org.springframework = debug
l...
Why is the order in dictionaries and sets arbitrary?
...tand how looping over a dictionary or set in python is done by 'arbitrary' order.
6 Answers
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GROUP_CONCAT ORDER BY
...
You can use ORDER BY inside the GROUP_CONCAT function in this way:
SELECT li.client_id, group_concat(li.percentage ORDER BY li.views ASC) AS views,
group_concat(li.percentage ORDER BY li.percentage ASC)
FROM li GROUP BY client_id
...
How to do SELECT COUNT(*) GROUP BY and ORDER BY in Django?
...t
Transaction.objects.all().values('actor').annotate(total=Count('actor')).order_by('total')
values() : specifies which columns are going to be used to "group by"
Django docs:
"When a values() clause is used to constrain the columns that are
returned in the result set, the method for evaluating an...
Javascript when to use prototypes
... @29er - in the way i have written this example, you are correct. The order does matter. If i were to keep this example as is, the Car.prototype = { ... } would have to come before calling a new Car() as illustrated in this jsfiddle: jsfiddle.net/mxacA . As for your argument, this would be the...
What is the difference between partitioning and bucketing a table in Hive ?
...eld is not too high.
Also, you can partition on multiple fields, with an order (year/month/day is a good example), while you can bucket on only one field.
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ActionController::InvalidAuthenticityToken
...ts some headers with more information about the original client request in order to be able to apply various processing tasks and security measures.
More details are available here: https://github.com/rails/rails/issues/22965.
TL;DR: the solution is to add some headers:
upstream myapp {
server ...
Converting a list to a set changes element order
Recently I noticed that when I am converting a list to set the order of elements is changed and is sorted by character.
...