coalesce

description

Syntax

coalesce(expr1, expr2, ...., expr_n))

返回参数中的第一个非空表达式（从左向右）

example

mysql> select coalesce(NULL, '1111', '0000');
+--------------------------------+
| coalesce(NULL, '1111', '0000') |
+--------------------------------+
| 1111                           |
+--------------------------------+

keywords

COALESCE