subquery-patterns-and-union

Features and purpose

Use OPAL subquery syntax (@labels) and union operations to combine multiple datasets or time periods. Essential for period-over-period comparisons, multi-dataset analysis, and complex data transformations. Covers @label <- @ syntax, timeshift for temporal shifts, union for combining results, and any_not_null() for collapsing grouped data.

Quick start

Follow the repository instructions for this skill and your agent. Review the files and dependencies before adding it to your workflow.