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PostgreSQL Complete Course / Queries & Joins

ROLLUP

Learn ROLLUP in PostgreSQL through the exact construct, a dedicated example, a boundary case, and a mastery check.

10 min read • Intermediate

ROLLUP is an atomic PostgreSQL lesson inside Queries & Joins. The example uses the specific syntax, command, API, instruction, or language rule named by this lesson.

Study the construct itself, then change one relevant input and predict the result before running it. That keeps this lesson focused on ROLLUP rather than on generic PostgreSQL syntax.

Topic-specific example

postgresql-03-06.sql
sql Try It Live 
SELECT region,city,SUM(total) FROM sales GROUP BY ROLLUP(region,city) ORDER BY region NULLS LAST,city NULLS LAST;
Edge case / engineering note

Test ROLLUP with an empty result, NULL/missing value, duplicate key, or concurrent operation where relevant; database behavior should be verified at the boundary shown by this example.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

ROLLUP Mastery Check →
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