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使用CONCAT函数添加到MySQL列中的现有值？

2024-05-13 18:08:03 452

为了理解这个概念，让我们首先创建一个演示表。

mysql> create table addToExistingValueDemo
   -> (
   -> Instructor_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> Instructor_Name varchar(30),
   -> Instructor_TechnicalSubject text
   -> );

使用insert命令在表中插入一些记录。查询如下-

mysql> insert into addToExistingValueDemo(Instructor_Name,Instructor_TechnicalSubject) values('John','C,C++');
mysql> insert into addToExistingValueDemo(Instructor_Name,Instructor_TechnicalSubject) values('Carol','Java,Python');
mysql> insert into addToExistingValueDemo(Instructor_Name,Instructor_TechnicalSubject) values('Bob','MySQL,SQL Server');
mysql> insert into addToExistingValueDemo(Instructor_Name,Instructor_TechnicalSubject) values('David','DataStructure');

这是使用CONCAT函数添加到MySQL列中现有值的查询

mysql> update addToExistingValueDemo
   -> set Instructor_TechnicalSubject=concat(Instructor_TechnicalSubject,', Introduction To Algorithm')
   -> where Instructor_Id=4;
Rows matched: 1 Changed: 1 Warnings: 0

让我们再次检查表记录以查看新更改。查询如下-

mysql> select *from addToExistingValueDemo;

以下是输出

+---------------+-----------------+------------------------------------------+
| Instructor_Id | Instructor_Name | Instructor_TechnicalSubject              |
+---------------+-----------------+------------------------------------------+
|             1 | John            | C,C++                                    |
|             2 | Carol           | Java,Python                              |
|             3 | Bob             | MySQL,SQL Server                         |
|             4 | David           | DataStructure, Introduction To Algorithm |
+---------------+-----------------+------------------------------------------+
4 rows in set (0.00 sec)

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使用CONCAT函数添加到MySQL列中的现有值？

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