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Which is faster: Sum(Case When) Or Group By/Count(*)?

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How to sum up values of two dimensional array separately in PHP

EntityDataSource where association count > 0

Select COUNT() from multiple databases in SQL

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Git count filtered commits

SQL Server procedure design to get results and results count in a single call

COUNT() doesn't work with GROUP BY?

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Oracle SQL - convert select count(*) into zero or one

select count() in a view

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EXPLAIN and COUNT returning two different values

Why use GROUP BY in WINDOW FUNCTION

Doctrine 2: Load entity and childs count

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Need to count the number of times a threshold value is met (or exceeded) per year (using R)

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Ajax Json count elements in callback array

r count cells with missing values across each row [duplicate]

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R: Sum variables based on some condition

COUNT rows from multiple joined tables - MSSQL

Is array.count() orders of magnitude slower than list.count() in Python?

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JavaScript function returning unique values sorted by count

Grouped count aggregation in R data.table

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