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Preferred order of writing latitude & longitude tuples in GIS services
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EPSG:4326 specifically states that the coordinate order should be latitude, longitude. Many software packages still use longitude, latitude ordering. This situation has wreaked unimaginable havoc on project deadlines and programmer sanity.
The best guidance one can offer is...
How to do SELECT COUNT(*) GROUP BY and ORDER BY in Django?
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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...
LIMIT 10..20 in SQL Server
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For SQL Server 2012 + you can use.
SELECT *
FROM sys.databases
ORDER BY name
OFFSET 5 ROWS
FETCH NEXT 5 ROWS ONLY
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Ruby on Rails: how do I sort with two columns using ActiveRecord?
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Assuming you're using MySQL,
Model.all(:order => 'DATE(updated_at), price')
Note the distinction from the other answers. The updated_at column will be a full timestamp, so if you want to sort based on the day it was updated, you need to use a function to get j...
How to display unique records from a has_many through relationship?
...q option on the has_many association:
has_many :products, :through => :orders, :uniq => true
From the Rails documentation:
:uniq
If true, duplicates will be omitted from the collection. Useful in conjunction with :through.
UPDATE FOR RAILS 4:
In Rails 4, has_many :products, :thr...
SQL order string as number
...your column value to an integer explicitly with
select col from yourtable
order by cast(col as unsigned)
or implicitly for instance with a mathematical operation which forces a conversion to number
select col from yourtable
order by col + 0
BTW MySQL converts strings from left to right. Examp...
How to keep keys/values in same order as declared?
I have a dictionary that I declared in a particular order and want to keep it in that order all the time. The keys/values can't really be kept in order based on their value, I just want it in the order that I declared it.
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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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GROUP_CONCAT ORDER BY
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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
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Is the order of iterating through std::map known (and guaranteed by the standard)?
...l iterate consequently through the elements with keys, sorted in ascending order?
6 Answers
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