Top "Count" questions

How to count how many values per level in a given factor?

I have a data.frame mydf with about 2500 rows. These rows correspond to 69 classes of objects in colum 1 mydf$V1, …

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Using GroupBy, Count and Sum in LINQ Lambda Expressions

I have a collection of boxes with the properties weight, volume and owner. I want to use LINQ to get …

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How to count the number of occurrences of a character in an Oracle varchar value?

How can I count number of occurrences of the character - in a varchar2 string? Example: select XXX('123-345…

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Lists: Count vs Count()

Given a list, which method is preferred to determine the number of elements inside? var myList = new List<string&…

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How to count items in JSON data

How I can get the number of elements in node of JSON data? JSON: { "result":[ { "run":[ { "action":"stop" }, { "action":"start" }, { "…

python json count element

jQuery count number of divs with a certain class?

Considering something like this; <div class="wrapper"> <div class="item"></div> <div class="…

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Getting the size of an array in an object

I would like some help with getting the size of an array inside an object: var st = { "itema":{...},"itemb":[{"id":"…

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Linq with group by having count

how do I write this query in linq (vb.net)? select B.Name from Company B group by B.Name …

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Count the Number of Tables in a SQL Server Database

I have a SQL Server 2012 database called MyDatabase. How can I find how many tables are in the database? I'm …

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PHP: Count a stdClass object

I have a stdClass object created from json_decode that won't return the right number when I run the count($…

php count stdclass