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MySQL-SELECT…特定列的输入(..)顺序在哪里？

2024-05-17 07:58:05 420

您可以使用field()函数选择….WHEREidIN(..)来对任何列进行排序。语法如下-

SELECT *FROM yourTableName WHERE yourColumnName IN(‘value1’,’value2’,.......N)
ORDER BY FIELD(yourColumnName,value1’,’value2’,.......N);

要了解上述语法，让我们创建一个表-

mysql> create table SelectOrderbyField
   -> (
   -> Id int NOT NULL AUTO_INCREMENT,
   -> Name varchar(30),
   -> Age int,
   -> PRIMARY KEY(Id)
   -> );

使用insert命令在表中插入一些记录。查询如下-

mysql> insert into SelectOrderbyField(Name,Age) values('John',23);

mysql> insert into SelectOrderbyField(Name,Age) values('Carol',25);

mysql> insert into SelectOrderbyField(Name,Age) values('Bob',21);

mysql> insert into SelectOrderbyField(Name,Age) values('Mike',28);

mysql> insert into SelectOrderbyField(Name,Age) values('Sam',26);

mysql> insert into SelectOrderbyField(Name,Age) values('David',23);

使用select语句显示表中的所有记录。查询如下-

mysql> select *from SelectOrderbyField;

以下是输出-

+----+-------+------+
| Id | Name  | Age  |
+----+-------+------+
|  1 | John  |   23 |
|  2 | Carol |   25 |
|  3 | Bob   |   21 |
|  4 | Mike  |   28 |
|  5 | Sam   |   26 |
|  6 | David | 23   |
+----+-------+------+
6 rows in set (0.00 sec)

以下是按field()函数排序以选择...whereidin(..)的查询。

带ID的订单列

查询如下-

mysql> select *from SelectOrderbyField where Id IN(5,1,3,2,6,4)
   -> order by field(Id,5,1,3,2,6,4);

以下是输出-

+----+-------+------+
| Id | Name  | Age  |
+----+-------+------+
|  5 | Sam   |   26 |
|  1 | John  |   23 |
|  3 | Bob   |   21 |
|  2 | Carol |   25 |
|  6 | David |   23 |
|  4 | Mike  | 28   |
+----+-------+------+
6 rows in set (0.00 sec)

带名称的订单列

您可以根据“名称”列正确排序。查询如下-

mysql> select *from SelectOrderbyField where Name IN('Sam','John','Bob','Carol','David','Mike')
   -> order by field(Name,'Sam','John','Bob','Carol','David','Mike');

以下是输出-

+----+-------+------+
| Id | Name  | Age  |
+----+-------+------+
| 5  | Sam   | 26   |
| 1  | John  | 23   |
| 3  | Bob   | 21   |
| 2  | Carol | 25   |
| 6  | David | 23   |
| 4  | Mike  | 28   |
+----+-------+------+
6 rows in set (0.03 sec)

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MySQL-SELECT…特定列的输入(..)顺序在哪里？

带ID的订单列

带名称的订单列

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