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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 | +----+-------------+-------------+
- The window frame clause is applied to
FIRST_VALUE. -
FIRST_VALUEsupports the optional NULL treatment clause.
Dialect support
This example using jOOQ:
firstValue(BOOK.ID).over(orderBy(BOOK.ID))
Translates to the following dialect specific expressions:
Aurora Postgres, BigQuery, ClickHouse, 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 */
Generated with jOOQ 3.20. Translate your own SQL on our website
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