Home | 簡體中文 | 繁體中文 | 雜文 | 打賞(Donations) | ITEYE 博客 | OSChina 博客 | Facebook | Linkedin | 知乎專欄 | Search | Email

27.5. 數值函數

27.5.1. cast 類型轉換

			
mysql> SELECT cast(SUBSTRING('123456789',1,4) as UNSIGNED) * 100;   
+----------------------------------------------------+
| cast(SUBSTRING('123456789',1,4) as UNSIGNED) * 100 |
+----------------------------------------------------+
|                                             123400 |
+----------------------------------------------------+
1 row in set (0.00 sec)		
			
			

27.5.2. truncate 保留小數位數

			
select profit, deficit, concat(truncate((profit / deficit)*100,2),'%') as percentage from ((select count(*) as profit from angelfund where profit > 0) as profit, (select count(*) as deficit from angelfund where profit < 0) as deficit);		
					
			

27.5.3. MOD 求余

			
mysql> select 9 mod 5;
+---------+
| 9 mod 5 |
+---------+
|       4 |
+---------+
1 row in set (0.00 sec)

mysql> select mod(5,2);
+----------+
| mod(5,2) |
+----------+
|        1 |
+----------+
1 row in set (0.00 sec)

mysql> select mod(5,2);