如何在 MySQL 中查找两个数字之间的绝对差?
mysqlmysqli database
要获取 MySQL 中两个数字之间的差，我们首先创建一个演示表
mysql> create table findDifferenceDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstNumber float, -> SecondNumber float -> ); Query OK, 0 rows affected (0.60 sec)
使用 insert 命令在表中插入一些记录。 查询语句如下 −
mysql> insert into findDifferenceDemo(FirstNumber,SecondNumber) values(4.2,2.3); Query OK, 1 row affected (0.20 sec) mysql> insert into findDifferenceDemo(FirstNumber,SecondNumber) values(23.4,5.6); Query OK, 1 row affected (0.14 sec) mysql> insert into findDifferenceDemo(FirstNumber,SecondNumber) values(5.8,34.56); Query OK, 1 row affected (0.16 sec) mysql> insert into findDifferenceDemo(FirstNumber,SecondNumber) values(7.8,7.2); Query OK, 1 row affected (0.16 sec) mysql> insert into findDifferenceDemo(FirstNumber,SecondNumber) values(12.8,10.2); Query OK, 1 row affected (0.13 sec)
使用 select 语句显示表中的所有记录。查询如下 −
mysql> select *from findDifferenceDemo;
以下是输出 −
+----+-------------+--------------+ | Id | FirstNumber | SecondNumber | +----+-------------+--------------+ | 1 | 4.2 | 2.3 | | 2 | 23.4 | 5.6 | | 3 | 5.8 | 34.56 | | 4 | 7.8 | 7.2 | | 5 | 12.8 | 10.2 | +----+-------------+--------------+ 5 rows in set (0.00 sec)
以下是在 MySQL 中查找两个数字之间的绝对差的查询
mysql> SELECT ABS(FirstNumber - secondNumber) AS diff -> from findDifferenceDemo -> order by diff desc;
以下是输出 −
+--------------------+ | diff | +--------------------+ | 28.760001182556152 | | 17.799999713897705 | | 2.6000003814697266 | | 1.8999998569488525 | | 0.6000003814697266 | +--------------------+ 5 rows in set (0.00 sec)
