如何在MySQL中将一个值进行CAST并与另一个值执行除法？

首先，使用CAST()函数进行类型转换。让我们创建一个表-

mysql> create table DemoTable1352
      -> (
      -> Value1 int,
      -> Value2 int
      -> );
Query OK, 0 rows affected (0.54 sec)

使用insert命令将一些记录插入到该表中-

mysql> insert into DemoTable1352 values(10,30);
Query OK, 1 row affected (0.42 sec)
mysql> insert into DemoTable1352 values(40,60);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1352 values(110,130);
Query OK, 1 row affected (0.18 sec)

使用select语句显示表中的所有记录-

mysql> select * from DemoTable1352;

这将产生以下输出:

+--------+--------+
| Value1 | Value2 |
+--------+--------+
|      10 |      30 |
|      40 |      60 |
|     110 |     130 |
+--------+--------+
3 rows in set (0.00 sec)

以下是将一个值进行类型转换并执行除法的查询-

mysql> select cast(Value1 as DECIMAL(18,14)) / Value2 from DemoTable1352;

这将产生以下输出-

+-----------------------------------------+
| cast(Value1 as DECIMAL(18,14)) / Value2 |
+-----------------------------------------+
|                          0.33333333333333 |
|                          0.66666666666667 |
|                          0.84615384615385 |
+-----------------------------------------+
3 rows in set (0.00 sec)