nvl

nvl

nvl

description

Syntax

nvl(expr1, expr2)

如果 expr1 的值不为 NULL 则返回 expr1，否则返回 expr2

example

mysql> select nvl(1,0);
+--------------+
| nvl(1, 0) |
+--------------+
|            1 |
+--------------+

mysql> select nvl(null,10);
+------------------+
| nvl(NULL, 10) |
+------------------+
|               10 |
+------------------+

keywords

NVL