Aggregate Pandas DataFrame Rows with Consistent Timedelta Between Datetime Index Values in Python

Counting Distinct IDs for Each Day within the Last 7 Days using SQL

Using Melt to Loop Over a Vector in Data.table: Filtering and Summarizing with by

Grouping By Day/Month/Year on a Subquery

Finding Top n Elements in Pandas DataFrame Column by Keeping the Grouping

Splitting a Pandas DataFrame into Equal Number of Groups Based on One Specific Column