How to add value to mysql?
Method to add value to mysql: Use the "INSERT INTO" statement to insert one or more rows of data into an existing table in the database; the syntax format is "INSERT INTO table name [column name 1 [, ... column name n] ] VALUES (value 1) [… , (value n)];”.
(Recommended tutorial: mysql video tutorial)
After the database and table are successfully created, you need to add the database table Insert data into . In MySQL, you can use the INSERT INTO statement to insert one or more rows of tuple data into an existing table in the database.
Basic syntax
The syntax format of INSERT INTO is:
INSERT INTO <表名> [ <列名1> [ , … <列名n>] ] VALUES (值1) [… , (值n) ];
The syntax description is as follows.
: Specify the name of the table to be operated on.
: Specify the column name into which data needs to be inserted. If data is inserted into all columns in the table, all column names can be omitted, and INSERT VALUES(…) can be used directly.
VALUES or VALUE clause: This clause contains the list of data to be inserted. The order of data in the data list should correspond to the order of columns.
In MySQL, processing multiple inserts with a single INSERT statement is faster than using multiple INSERT statements.
When using a single INSERT statement to insert multiple rows of data, you only need to enclose each row of data in parentheses.
Add values to all fields in the table
There are two ways to insert values into all fields in the table: one is to specify all field names; the other It does not specify the field name at all.
[Example 1] Insert a new record in the tb_courses table, the course_id value is 1, the course_name value is "Network", the course_grade value is 3, and the info value is "Computer Network".
Before performing the insert operation, view the SQL statement and execution results of the tb_courses table as follows.
mysql> SELECT * FROM tb_courses; Empty set (0.00 sec)
Copy after loginThe query result shows that the current table content is empty and there is no data. Next, perform the operation of inserting data. The input SQL statement and execution process are as follows.
mysql> INSERT INTO tb_courses -> (course_id,course_name,course_grade,course_info) -> VALUES(1,'Network',3,'Computer Network'); Query OK, 1 rows affected (0.08 sec) mysql> SELECT * FROM tb_courses; +-----------+-------------+--------------+------------------+ | course_id | course_name | course_grade | course_info | +-----------+-------------+--------------+------------------+ | 1 | Network | 3 | Computer Network | +-----------+-------------+--------------+------------------+ 1 row in set (0.00 sec)Copy after loginYou can see that the record was inserted successfully. When inserting data, all fields of the tb_courses table are specified, so new values will be inserted for each field.
The order of the column names after the INSERT statement does not need to be the order when the tb_courses table is defined. That is, when inserting data, it is not necessary to insert in the order defined by the table, as long as the order of the values is ensured to be the same as the order of the column fields.
[Example 2] Insert a new record in the tb_courses table, the course_id value is 2, the course_name value is "Database", the course_grade value is 3, and the info value is "MySQL". The input SQL statement and execution results are shown below.
mysql> INSERT INTO tb_courses -> (course_name,course_info,course_id,course_grade) -> VALUES('Database','MySQL',2,3); Query OK, 1 rows affected (0.08 sec) mysql> SELECT * FROM tb_courses; +-----------+-------------+--------------+------------------+ | course_id | course_name | course_grade | course_info | +-----------+-------------+--------------+------------------+ | 1 | Network | 3 | Computer Network | | 2 | Database | 3 | MySQL | +-----------+-------------+--------------+------------------+ 2 rows in set (0.00 sec)Copy after loginWhen using INSERT to insert data, the column name list column_list is allowed to be empty. At this time, the value list needs to specify a value for each field of the table, and the order of the values must be the same as the order in which the fields are defined in the data table. same.
[Example 3] Insert a new record in the tb_courses table, the course_id value is 3, the course_name value is "Java", the course_grade value is 4, and the info value is "Jave EE". The input SQL statement and execution results are shown below.
mysql> INSERT INTO tb_courses -> VLAUES(3,'Java',4,'Java EE'); Query OK, 1 rows affected (0.08 sec) mysql> SELECT * FROM tb_courses; +-----------+-------------+--------------+------------------+ | course_id | course_name | course_grade | course_info | +-----------+-------------+--------------+------------------+ | 1 | Network | 3 | Computer Network | | 2 | Database | 3 | MySQL | | 3 | Java | 4 | Java EE | +-----------+-------------+--------------+------------------+ 3 rows in set (0.00 sec)Copy after loginThe INSERT statement does not specify an insertion list, only a value list. In this case, the value list specifies the inserted values for each field column, and the values must be in the same order as the fields are defined in the tb_courses table.
Note: Although the column name of the inserted data can be ignored when using INSERT to insert data, if the value does not contain the column name, the value after the VALUES keyword must not only be complete, but also the order must be the same as the order of the columns when the table is defined. same. If the structure of the table is modified and columns are added, deleted, or their positions are changed, these operations will cause the order in which data is inserted in this way to change at the same time. If you specify column names, they will not be affected by table structure changes.
Add values to specified fields in the table
Insert data into specified fields in the table. Insert values into only some fields in the INSERT statement, while other fields The value is the default value when the table is defined.
[Example 4] Insert a new record in the tb_courses table, the course_name value is "System", the course_grade value is 3, the course_info value is "Operating System", the input SQL statement and execution results are as follows.
mysql> INSERT INTO tb_courses -> (course_name,course_grade,course_info) -> VALUES('System',3,'Operation System'); Query OK, 1 rows affected (0.08 sec) mysql> SELECT * FROM tb_courses; +-----------+-------------+--------------+------------------+ | course_id | course_name | course_grade | course_info | +-----------+-------------+--------------+------------------+ | 1 | Network | 3 | Computer Network | | 2 | Database | 3 | MySQL | | 3 | Java | 4 | Java EE | | 4 | System | 3 | Operating System | +-----------+-------------+--------------+------------------+ 4 rows in set (0.00 sec)Copy after loginYou can see that the record was inserted successfully. As the query results show, an integer value 4 is automatically added to the course_id field here. At this time, the course_id field is the primary key of the table and cannot be empty. The system automatically inserts an auto-incrementing sequence value for this field. When inserting records, if some fields do not specify an insertion value, MySQL will insert the default value when the field is defined.
For more programming-related knowledge, please visit: Introduction to Programming! !
The above is the detailed content of How to add value to mysql?. For more information, please follow other related articles on the PHP Chinese website!
Statement of this WebsiteThe content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Roblox: Grow A Garden - Complete Mutation Guide3 weeks ago By DDDRoblox: Bubble Gum Simulator Infinity - How To Get And Use Royal Keys3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌How to fix KB5055612 fails to install in Windows 10?3 weeks ago By DDDNordhold: Fusion System, Explained3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌Mandragora: Whispers Of The Witch Tree - How To Unlock The Grappling Hook3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Java Tutorial
1665
14
CakePHP Tutorial
1424
52
Laravel Tutorial
1322
25
PHP Tutorial
1270
29
C# Tutorial
1250
24
See all articles
Laravel Introduction Example
Apr 18, 2025 pm 12:45 PM
Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.
MySQL and phpMyAdmin: Core Features and Functions
Apr 22, 2025 am 12:12 AM
MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.
MySQL vs. Other Programming Languages: A Comparison
Apr 19, 2025 am 12:22 AM
Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.
Solve database connection problem: a practical case of using minii/db library
Apr 18, 2025 am 07:09 AM
I encountered a tricky problem when developing a small application: the need to quickly integrate a lightweight database operation library. After trying multiple libraries, I found that they either have too much functionality or are not very compatible. Eventually, I found minii/db, a simplified version based on Yii2 that solved my problem perfectly.
Laravel framework installation method
Apr 18, 2025 pm 12:54 PM
Article summary: This article provides detailed step-by-step instructions to guide readers on how to easily install the Laravel framework. Laravel is a powerful PHP framework that speeds up the development process of web applications. This tutorial covers the installation process from system requirements to configuring databases and setting up routing. By following these steps, readers can quickly and efficiently lay a solid foundation for their Laravel project.
Solve MySQL mode problem: The experience of using the TheliaMySQLModesChecker module
Apr 18, 2025 am 08:42 AM
When developing an e-commerce website using Thelia, I encountered a tricky problem: MySQL mode is not set properly, causing some features to not function properly. After some exploration, I found a module called TheliaMySQLModesChecker, which is able to automatically fix the MySQL pattern required by Thelia, completely solving my troubles.
MySQL: Structured Data and Relational Databases
Apr 18, 2025 am 12:22 AM
MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.
MySQL: Key Features and Capabilities Explained
Apr 18, 2025 am 12:17 AM
MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.
