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GROUP BY columns

Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

The GROUP BY columns list specifies the columns whose values are used to form groups. The group columns can then be projected, whereas all the non-group columns can be aggregated. An example of such a grouped aggregation is this query:

SELECT AUTHOR_ID, COUNT(*)
FROM BOOK
GROUP BY AUTHOR_ID
 
create.select(BOOK.AUTHOR_ID, count())
      .from(BOOK)
      .groupBy(BOOK.AUTHOR_ID)
      .fetch();

The above example counts all books per author.

Note: a different and more powerful way of grouping data is to use the WINDOW clause and window functions.

Dialect support

This example using jOOQ:

select(BOOK.AUTHOR_ID, count()).from(BOOK).groupBy(BOOK.AUTHOR_ID)

Translates to the following dialect specific expressions:

-- All dialects
SELECT
  BOOK.AUTHOR_ID,
  count(*)
FROM BOOK
GROUP BY BOOK.AUTHOR_ID

(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website

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