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WINDOW clauseWINDOW clause
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The SQL:2003 standard supports a WINDOW
clause that allows for specifying WINDOW
frames for reuse in SELECT clauses and ORDER BY clauses.
SELECT LAG(first_name, 1) OVER w "prev", first_name, LEAD(first_name, 1) OVER w "next" FROM author WINDOW w AS (ORDER first_name) ORDER BY first_name DESC
WindowDefinition w = name("w").as( orderBy(PEOPLE.FIRST_NAME)); create.select( lag(AUTHOR.FIRST_NAME, 1).over(w).as("prev"), AUTHOR.FIRST_NAME, lead(AUTHOR.FIRST_NAME, 1).over(w).as("next")) .from(AUTHOR) .window(w) .orderBy(AUTHOR.FIRST_NAME.desc()) .fetch();
Note that in order to create such a window definition, we need to first create a name reference using DSL.name()
.
Even if only PostgreSQL and Sybase SQL Anywhere natively support this great feature, jOOQ can emulate it by expanding any org.jooq.WindowDefinition
and org.jooq.WindowSpecification
types that you pass to the window()
method - if the database supports window functions at all.
Some more information about window functions and the WINDOW
clause can be found on our blog: https://blog.jooq.org/probably-the-coolest-sql-feature-window-functions/
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