How to sum dict elements
You can use the collections.Counter counter = collections.Counter() for d in dict1: counter.update(d) Or, if you prefer oneliners: functools.reduce(operator.add, map(collections.Counter, dict1))
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SQL not a single-group group function
Well the problem simply-put is that the SUM(TIME) for a specific SSN on your query is a single value, so it’s objecting to MAX as it makes no sense (The maximum of a single value is meaningless). Not sure what SQL database server you’re using but I suspect you want a query more like this … Read more
How can I change NULL to 0 when getting a single value from a SQL function?
Most database servers have a COALESCE function, which will return the first argument that is non-null, so the following should do what you want: SELECT COALESCE(SUM(Price),0) AS TotalPrice FROM Inventory WHERE (DateAdded BETWEEN @StartDate AND @EndDate) Since there seems to be a lot of discussion about COALESCE/ISNULL will still return NULL if no rows match, … Read more
Sum 2 hashes attributes with the same key
a_hash = {‘a’ => 30, ‘b’ => 14} b_hash = {‘a’ => 4, ‘b’ => 23, ‘c’ => 7} a_hash.merge(b_hash){ |k, a_value, b_value| a_value + b_value } => {“a”=>34, “b”=>37, “c”=>7} b_hash.merge(a_hash){ |k, b_value, a_value| a_value + b_value } => {“a”=>34, “b”=>37, “c”=>7}
Performing a query on a result from another query?
Usually you can plug a Query’s result (which is basically a table) as the FROM clause source of another query, so something like this will be written: SELECT COUNT(*), SUM(SUBQUERY.AGE) from ( SELECT availables.bookdate AS Date, DATEDIFF(now(),availables.updated_at) as Age FROM availables INNER JOIN rooms ON availables.room_id=rooms.id WHERE availables.bookdate BETWEEN ‘2009-06-25’ AND date_add(‘2009-06-25’, INTERVAL 4 DAY) … Read more
Sum of row n through last row
If you want something that just works in Google Spreadsheets (as the title suggests), you can use open-ended ranges: =SUM(A2:A) In Excel, you can specify the maximum rows for that version; for example, for 2007 and 2010: =SUM(A2:A1048576) This will work in Google Spreadsheets as well, and is beyond the current theoretical row limit in … Read more
ruby: sum corresponding members of two or more arrays
Here’s the transpose version Anurag suggested: [[1,2,3], [4,5,6]].transpose.map {|x| x.reduce(:+)} This will work with any number of component arrays. reduce and inject are synonyms, but reduce seems to me to more clearly communicate the code’s intent here…
How to sum two fields in AngularJS and show the result in an label?
Have you actually created a parseFloat method in your controller? Because you can’t simply use JS in Angular expressions, see Angular Expressions vs. JS Expressions. function controller($scope) { $scope.parseFloat = function(value) { return parseFloat(value); } } edit: it should also be possible to simply set a reference to the original function: $scope.parseFloat = parseFloat; I … Read more