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Mysql中的if语句
1.语法
if(expr,a,b)
:如果expr为真,则取a,否则取b
2.实例
mysql> select if(2>1,3,4);
+-------------+
| if(2>1,3,4) |
+-------------+
| 3 |
+-------------+
1 row in set (0.00 sec)
mysql> select if(2<1,3,4);
+-------------+
| if(2<1,3,4) |
+-------------+
| 4 |
+-------------+
1 row in set (0.00 sec)