To create a combined report from two tables, which query method should be used?

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Multiple Choice

To create a combined report from two tables, which query method should be used?

When you want to create a single report by bringing together all rows from two tables, use a union. This operation stacks the rows from each table into one result set, so the tables should share the same columns (same structure and data types) to align properly. If you want to include every row, even duplicates, choose the union all variant; if you want to remove duplicates, choose union (which does that automatically). This approach focuses on combining datasets vertically to produce a unified report. Joining would merge related rows side-by-side based on a key, producing more columns rather than appending rows. Nesting is about subqueries within a query, not about merging two whole tables. Grouping is for aggregating data within a single set, not for combining two tables into one report.

When you want to create a single report by bringing together all rows from two tables, use a union. This operation stacks the rows from each table into one result set, so the tables should share the same columns (same structure and data types) to align properly. If you want to include every row, even duplicates, choose the union all variant; if you want to remove duplicates, choose union (which does that automatically). This approach focuses on combining datasets vertically to produce a unified report.

Joining would merge related rows side-by-side based on a key, producing more columns rather than appending rows. Nesting is about subqueries within a query, not about merging two whole tables. Grouping is for aggregating data within a single set, not for combining two tables into one report.

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