3284
MySQLERRORNotableWindow FunctionsHIGH confidence
Invalid use of window function alias
Production Risk
Low — query is rejected; restructure with a subquery.
How to reproduce
trigger — this will error
trigger — this will error
SELECT ROW_NUMBER() OVER (ORDER BY id) AS rn FROM t1 WHERE rn < 10;
expected output
ERROR 3284 (HY000): Window function 'rn' cannot be referenced in WHERE clause.
Fix
Use a derived table
Use a derived table
SELECT * FROM (SELECT ROW_NUMBER() OVER (ORDER BY id) AS rn, id FROM t1) sub WHERE rn < 10;
Why this works
The outer query can filter on the window function alias computed in the inner query.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3284 ER_INVALID_WINDOW_FUNC_ALIAS_USE
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