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How can I pivot a dataframe?

pythonpandasgroup-bypivotpandas-groupby
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Select first row in each GROUP BY group?

sqlgroup-bygreatest-n-per-groupsqlitepostgresql
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Retrieving the last record in each group - MySQL

mysqlsqlgroup-bygreatest-n-per-groupgroupwise-maximum
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Most efficient method to groupby on an array of objects

arraysjavascriptobjectgroup-byunderscore.js
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How do I Pandas group-by to get sum?

pythonpandasgroup-bydataframeaggregate
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