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NVL
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The NVL() function (or also the ISNULL() or IFNULL() functions) produces the first argument if it is NOT NULL, otherwise the second argument. It is a special case of the COALESCE function, which takes any number of arguments.
SELECT nvl(null, 1);
create.select(nvl(null, 1)).fetch();
The result being
+-----+ | nvl | +-----+ | 1 | +-----+
Dialect support
This example using jOOQ:
nvl(null, 1)
Translates to the following dialect specific expressions:
-- ACCESS iif(NULL IS NULL, 1, NULL) -- ASE, CUBRID, FIREBIRD, HANA, INFORMIX, REDSHIFT, SQLDATAWAREHOUSE, SQLSERVER, SYBASE, TERADATA, VERTICA CASE WHEN NULL IS NOT NULL THEN NULL ELSE 1 END -- AURORA_MYSQL, MARIADB, MEMSQL, MYSQL, SQLITE ifnull(NULL, 1) -- AURORA_POSTGRES, COCKROACHDB, DERBY, POSTGRES COALESCE(NULL, 1) -- DB2, H2, HSQLDB, INGRES, ORACLE nvl(NULL, 1)
(These are currently generated with jOOQ 3.14, see #10141)
