Grouping

Grouping with GroupBy

Learn how LINQ's GroupBy operator clusters elements by a key into IGrouping sequences, including result selectors, composite keys, and how it differs from SQL'…

test() and describe() Blocks

How to organize related tests using describe() blocks, and the setup/teardown hooks that run alongside them.

Sorting and Grouping

Learn to order pipeline output with Sort-Object and cluster it into buckets with Group-Object, including combining both with Measure-Object for reports.

Aggregations and Grouping

Master aggregate functions and GROUP BY/HAVING to summarize rows into meaningful totals, averages, and counts in SQL Server.

Grouping Commands with Braces

Using { } to bind multiple sed commands to a single address so they execute together as a block, including nesting and separator rules.

Structs and Enums in Solidity

Structs group related fields into custom record types, while enums give readable names to a fixed set of states — together they turn loose primitives into safe…

Subshells and Command Grouping

Learn how bash isolates execution with subshells using parentheses versus grouping commands in the current shell with braces, and why the distinction matters f…

Grouping and Accumulators

Master the $group stage and its accumulator operators to compute sums, averages, counts, and other summaries across groups of documents.

GroupBy Basics

Understand pandas' split-apply-combine model via groupby(), including grouping keys, selecting columns, and iterating over groups.