first_value()

Returns value evaluated at the row that is the first row of the window frame.

Signature

first_value ( value anyelement ) → anyelement

Examples

SELECT product, first_value(product) OVER (ORDER BY amount) FROM orders;

 product  | first_value 
----------+-------------
 cable    | cable
 mouse    | cable
 keyboard | cable
 keyboard | cable
 monitor  | cable
 monitor  | cable
(6 rows)

Run against PostgreSQL 18.6 on 2026-09-13. This is the output we got, not the documentation’s.

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