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QUALIFY to derived table

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

Teradata introduced the useful QUALIFY clause, which has since been reproduced by a number of implementations. jOOQ can transform a query containing the QUALIFY clause to an equivalent query filtering on a derived table

This transformation allows for transforming some of these syntaxes to equivalent, standard syntax using window functions and derived tables:

-- Input
  row_number () OVER (ORDER BY id) <= 5
-- Output
  SELECT *, row_number () OVER (ORDER BY id) AS rn FROM t
) AS t
WHERE t.rn <= 5

Example configuration

Settings settings = new Settings()

References to this page


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