NULLIF

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

The NULLIF() function produces a NULL value if both its arguments are equal, otherwise it produces the first argument.

SELECT nullif(1, 1), nullif(1, 2);

create.select(nullif(1, 1), nullif(1, 2)).fetch();

The result being

+--------+--------+
| nullif | nullif |
+--------+--------+
|        |      1 |
+--------+--------+

Dialect support

This example using jOOQ:

nullif(1, 2)

Translates to the following dialect specific expressions:

-- ACCESS
iif(1 = 2, NULL, 1)

-- ASE, AURORA_MYSQL, AURORA_POSTGRES, BIGQUERY, COCKROACHDB, CUBRID, DB2, DERBY, FIREBIRD, H2, HANA, HSQLDB, IGNITE, 
-- INFORMIX, INGRES, MARIADB, MEMSQL, MYSQL, ORACLE, POSTGRES, REDSHIFT, SNOWFLAKE, SQLDATAWAREHOUSE, SQLITE, SQLSERVER, SYBASE, 
-- TERADATA, VERTICA
nullif(1, 2)

(These are currently generated with jOOQ 3.15, see #10141)

The jOOQ User Manual : SQL building : Column expressions : General functions : NULLIF

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