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Derived tables
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
A derived table is a nested SELECT in the FROM clause, i.e. it can be used as a table expression. As such, it works differently from a scalar subquery, which is a column expression.
SELECT nested.* FROM (
SELECT AUTHOR_ID, count(*) books
FROM BOOK
GROUP BY AUTHOR_ID
) nested
ORDER BY nested.books DESC
Table<?> nested =
create.select(BOOK.AUTHOR_ID, count().as("books"))
.from(BOOK)
.groupBy(BOOK.AUTHOR_ID).asTable("nested");
create.select(nested.fields())
.from(nested)
.orderBy(nested.field("books"))
.fetch();
Dialect support
This example using jOOQ:
selectFrom(select(BOOK.ID).from(BOOK).asTable("t"))
Translates to the following dialect specific expressions:
All dialects
SELECT t.ID FROM ( SELECT BOOK.ID FROM BOOK ) t
Generated with jOOQ 3.20. Translate your own SQL on our website
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