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GROUP BY ROLLUP
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
In reports, it may be useful to run multiple aggregations across multiple dimensions of the data in one go. ROLLUP is one way to do this.
SELECT AUTHOR_ID, PUBLISHED_IN, COUNT(*) FROM BOOK GROUP BY ROLLUP (AUTHOR_ID, PUBLISHED_IN)
create.select(BOOK.AUTHOR_ID, BOOK.PUBLISHED_IN, count())
.from(BOOK)
.groupBy(rollup(BOOK.AUTHOR_ID, BOOK.PUBLISHED_IN))
.fetch();
The above is a more concise (and possibly more performant) form of writing the following UNION ALL query:
SELECT AUTHOR_ID, PUBLISHED_IN, COUNT(*) FROM BOOK GROUP BY AUTHOR_ID, PUBLISHED_IN UNION ALL SELECT AUTHOR_ID, NULL, COUNT(*) FROM BOOK GROUP BY AUTHOR_ID UNION ALL SELECT NULL, NULL, COUNT(*) FROM BOOK GROUP BY ()
The ROLLUP function is just syntax sugar for a more complex GROUPING SETS specification. In general:
-- This ROLLUP (A, B, C) -- Is just short for this GROUPING SETS ((A, B, C), (A, B), (A), ())
An example result set might look like this:
+-----------+--------------+----------+ | AUTHOR_ID | PUBLISHED_IN | COUNT(*) | +-----------+--------------+----------+ | 1 | 1945 | 1 | <- GROUP BY (AUTHOR_ID, PUBLISHED_IN) | 1 | 1948 | 1 | <- GROUP BY (AUTHOR_ID, PUBLISHED_IN) | 1 | NULL | 2 | <- GROUP BY (AUTHOR_ID) | 2 | 1988 | 1 | <- GROUP BY (AUTHOR_ID, PUBLISHED_IN) | 2 | 1990 | 1 | <- GROUP BY (AUTHOR_ID, PUBLISHED_IN) | 2 | NULL | 2 | <- GROUP BY (AUTHOR_ID) | NULL | NULL | 4 | <- GROUP BY () +-----------+--------------+----------+
Dialect support
This example using jOOQ:
select(BOOK.AUTHOR_ID, BOOK.LANGUAGE_ID, count()).from(BOOK).groupBy(rollup(BOOK.AUTHOR_ID, BOOK.LANGUAGE_ID))
Translates to the following dialect specific expressions:
Aurora MySQL, MariaDB, MySQL
SELECT BOOK.AUTHOR_ID, BOOK.LANGUAGE_ID, count(*) FROM BOOK GROUP BY BOOK.AUTHOR_ID, BOOK.LANGUAGE_ID WITH ROLLUP
Aurora Postgres, ClickHouse, DB2, DuckDB, Hana, MemSQL, Oracle, Postgres, SQLDataWarehouse, SQLServer, Snowflake, Sybase, Teradata, Trino, Vertica
SELECT BOOK.AUTHOR_ID, BOOK.LANGUAGE_ID, count(*) FROM BOOK GROUP BY ROLLUP (BOOK.AUTHOR_ID, BOOK.LANGUAGE_ID)
ASE, Access, BigQuery, CockroachDB, Derby, Exasol, Firebird, H2, HSQLDB, Informix, Redshift, SQLite, YugabyteDB
/* UNSUPPORTED */
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