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Version: 2.5

coalesce

Description​

Returns the first non-NULL expression among the input parameters. Returns NULL if non-NULL expressions cannot be found.

Syntax​

coalesce(expr1,...);

Parameters​

expr1: the input expressions, which must evaluate to compatible data types. The supported data types are BOOLEAN, TINYINT, SMALLINT, INT, BIGINT, LARGEINT, FLOAT, DOUBLE, DATETIME, DATE, DECIMALV2, DECIMAL32, DECIMAL64, DECIMAL128, VARCHAR, BITMAP, PERCENTILE, HLL, and TIME.

Return value​

The return value has the same type as expr1.

Examples​

mysql> select coalesce(3,NULL,1,1);
+-------------------------+
| coalesce(3, NULL, 1, 1) |
+-------------------------+
|                       3 |
+-------------------------+
1 row in set (0.00 sec)