hopeless-dream

导航

MySQL内置函数-单行函数(进制换算函数)

进制换算

conv(n,from_base,to_base)

复制代码
例如:
 
mysql> select conv("a",16,2);  --意思就是 将16进制的‘a’转换成2进制的

+----------------+
| conv("a",16,2) |
+----------------+
| 1010           |
+----------------+
1 row in set (0.00 sec)
复制代码
复制代码
mysql> select ascii('a');
+------------+
| ascii('a') |
+------------+
|         97 |
+------------+
1 row in set (0.00 sec)

mysql> select bin(10);
+---------+
| bin(10) |
+---------+
| 1010    |
+---------+
1 row in set (0.00 sec)

mysql> select oct(10);
+---------+
| oct(10) |
+---------+
| 12      |
+---------+
1 row in set (0.00 sec)

mysql> select hex(10);
+---------+
| hex(10) |
+---------+
| A       |
+---------+
1 row in set (0.00 sec)
复制代码

char(n,...) 返回由参数n,...对应的ascii代码字符组成的一个字串(参数是n,...是数字序列,null值被跳过

复制代码
mysql> select char(77,121,83,81,'76');
+-------------------------+
| char(77,121,83,81,'76') |
+-------------------------+
| MySQL                   |
+-------------------------+
1 row in set (0.00 sec)

mysql> select char(77,77.5,'77.3');
+----------------------+
| char(77,77.5,'77.3') |
+----------------------+
| MNM                  |
+----------------------+
1 row in set, 1 warning (0.00 sec)
复制代码

posted on   hopeless-dream  阅读(370)  评论(0编辑  收藏  举报

努力加载评论中...
点击右上角即可分享
微信分享提示