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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.
LEAD
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The LEAD window function allows for getting the value of an expression evaluated on the next row, or the nth next row if an offset is given.
SELECT ID, lead(ID) OVER (ORDER BY ID), lead(ID, 2) OVER (ORDER BY ID), lead(ID, 2, -1) OVER (ORDER BY ID) FROM BOOK;
create.select(
BOOK.ID,
lead(BOOK.ID).over(orderBy(BOOK.ID)),
lead(BOOK.ID, 2).over(orderBy(BOOK.ID)),
lead(BOOK.ID, 2, -1).over(orderBy(BOOK.ID)))
.from(BOOK)
.fetch();
Producing:
+----+------+------+------+ | id | lead | lead | lead | +----+------+------+------+ | 1 | 2 | 3 | 3 | | 2 | 3 | 4 | 4 | | 3 | 4 | | -1 | | 4 | | | -1 | +----+------+------+------+
Notes:
- The window frame clause has no effect on
LEAD. -
LEADsupports the optional NULL treatment clause.
Dialect support
This example using jOOQ:
lead(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, SNOWFLAKE, SQLDATAWAREHOUSE, SQLITE, SQLSERVER, TERADATA, TRINO, VERTICA, YUGABYTEDB lead(BOOK.ID) OVER (ORDER BY BOOK.ID) -- ACCESS, ASE, AURORA_MYSQL, DERBY, HSQLDB, SYBASE /* UNSUPPORTED */
(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website
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