Available in versions: Dev (3.22)
This documentation is for the unreleased development version of jOOQ. Click on the above version links to get this documentation for a supported version of jOOQ.
IS_FIRST
Supported by ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The IS_FIRST window function allows for checking if a row is among the first N rows within a window using ROW_NUMBER semantics.
For example:
SELECT ID, is_first(2) OVER (ORDER BY ID) FROM BOOK;
create.select(
BOOK.ID,
isFirst(2).over(orderBy(BOOK.ID)))
.from(BOOK)
.fetch();
Producing:
+----+----------+ | id | is_first | +----+----------+ | 1 | true | | 2 | true | | 3 | false | | 4 | false | +----+----------+
Dialect support
This example using jOOQ:
isFirst(2).over(orderBy(BOOK.ID))
Translates to the following dialect specific expressions:
Aurora Postgres, BigQuery, ClickHouse, CockroachDB, Databricks, DuckDB, Exasol, Firebird, H2, MariaDB, MemSQL, MySQL, Oracle, Postgres, Redshift, SQLite, Snowflake, Trino, Vertica, YugabyteDB
(row_number() OVER (ORDER BY BOOK.ID) <= 2)
DB2, SQLDataWarehouse, SQLServer, Sybase, Teradata
CASE WHEN row_number() OVER (ORDER BY BOOK.ID) <= 2 THEN 1 WHEN NOT (row_number() OVER (ORDER BY BOOK.ID) <= 2) THEN 0 END
Hana
CASE WHEN row_number() OVER (ORDER BY BOOK.ID) <= 2 THEN TRUE WHEN NOT (row_number() OVER (ORDER BY BOOK.ID) <= 2) THEN FALSE END
Informix
CASE
WHEN row_number() OVER (ORDER BY BOOK.ID) <= 2 THEN cast('t' AS boolean)
WHEN NOT (row_number() OVER (ORDER BY BOOK.ID) <= 2) THEN cast('f' AS boolean)
END
ASE, Access, Aurora MySQL, HSQLDB, Spanner
/* UNSUPPORTED */
Generated with jOOQ 3.22. Support in older jOOQ versions may differ. Translate your own SQL on our website
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