Count number of rows per group and add result to original data frame

rr-faqaggregatecount
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Group By Multiple Columns

c#.netgroup-byaggregatelinq
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Apply several summary functions on several variables by group in one call

rr-faqaggregate
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eventscode-formattinglanguage-agnosticcredentialsandroid-dialogform-submitmingwcometserviceapache-httpclient-4.xaggregation-frameworkfluid-layoutiodbcontextdeserializationconfluent-platformjava-2davr-gccgit-configjsf