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FIRST_VALUE

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

The FIRST_VALUE window function allows for getting the value of an expression evaluated on the first row of the window.

SELECT
  ID,
  first_value(ID) OVER (ORDER BY ID),
  first_value(ID) OVER (ORDER BY ID ROWS 1 PRECEDING)
FROM
  BOOK;
create.select(
         BOOK.ID,
         firstValue(BOOK.ID).over(orderBy(BOOK.ID)),
         firstValue(BOOK.ID).over(orderBy(BOOK.ID).rowsPreceding(1)))
     .from(BOOK)
     .fetch();

Producing:

+----+-------------+-------------+
| id | first_value | first_value |
+----+-------------+-------------+
|  1 |           1 |           1 |
|  2 |           1 |           1 |
|  3 |           1 |           2 |
|  4 |           1 |           3 |
+----+-------------+-------------+

Dialect support

This example using jOOQ:

firstValue(BOOK.ID).over(orderBy(BOOK.ID))

Translates to the following dialect specific expressions:

Aurora Postgres, BigQuery, CockroachDB, DB2, DuckDB, Exasol, Firebird, H2, Hana, Informix, MariaDB, MemSQL, MySQL, Oracle, Postgres, Redshift, SQLDataWarehouse, SQLServer, SQLite, Snowflake, Sybase, Teradata, Trino, Vertica, YugabyteDB

first_value(BOOK.ID) OVER (ORDER BY BOOK.ID)

ASE, Access, Aurora MySQL, Derby, HSQLDB

/* UNSUPPORTED */

(These are currently generated with jOOQ 3.20, see #10141), or translate your own on our website

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