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COALESCE

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

The COALESCE() function produces the first non-NULL value from the variadic list of arguments.

SELECT coalesce(null, null, 1);
create.select(coalesce(null, null, 1)).fetch();

The result being

+----------+
| coalesce |
+----------+
|        1 |
+----------+

Dialect support

This example using jOOQ:

coalesce(null, null, 1)

Translates to the following dialect specific expressions:

-- ACCESS, ASE, AURORA_MYSQL, AURORA_POSTGRES, COCKROACHDB, CUBRID, DB2, DERBY, FIREBIRD, H2, HANA, HSQLDB, INGRES, MARIADB, 
-- MEMSQL, MYSQL, ORACLE, POSTGRES, REDSHIFT, SQLDATAWAREHOUSE, SQLITE, SQLSERVER, SYBASE, TERADATA, VERTICA
coalesce(NULL, NULL, 1)

-- INFORMIX
CASE WHEN CASE WHEN NULL IS NOT NULL THEN NULL ELSE NULL END IS NOT NULL THEN CASE WHEN NULL IS NOT NULL THEN NULL ELSE NULL END ELSE 1 END

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

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