How to query the table structure in mysql

Mysql query table structure method: 1. Use the DESCRIBE statement, whose syntax is "DESCRIBE table_name;"; 2. Use the SHOW COLUMNS statement, whose syntax is "SHOW COLUMNS FROM table_name;"; 3. Query information_schema Database, the syntax is "USE information_schema;".

The operating system of this tutorial: Windows 10 system, mysql version 8.0, Dell G3 computer.

MySQL is an open source relational database management system that is widely used in various Web applications. In MySQL, the query table structure can be implemented in many ways. Three common methods will be introduced below.

1. Use the DESCRIBE statement

The DESCRIBE statement is a simple and fast method of querying the table structure provided by MySQL. The syntax is as follows:

DESCRIBE table_name;

Among them, table_name is the name of the table to be queried. After executing the DESCRIBE statement, MySQL will return the structural information of the table, including column names, data types, whether it is NULL, default values, etc.

For example, to query the table structure named users, you can execute the following statement:

DESCRIBE users;

2. Use the SHOW COLUMNS statement

The SHOW COLUMNS statement is another statement provided by MySQL A method of querying the structure of a table that displays the table's column information in more detail. The syntax is as follows:

SHOW COLUMNS FROM table_name;

Among them, table_name is the name of the table to be queried. After executing the SHOW COLUMNS statement, MySQL will return the column information of the table, including column name, data type, whether it is NULL, default value, additional attributes, etc.

For example, to query the table structure named users, you can execute the following statement:

SHOW COLUMNS FROM users;

3. Query the information_schema database

The information_schema database in MySQL contains information about all databases , tables, columns and other information metadata. Table structure information can be obtained by querying the related tables of the information_schema database.

First, connect to the MySQL server and select the information_schema database:

USE information_schema;

Then, you can obtain the information of all tables by querying the tables table. For example, to query the table structure named users, you can execute the following statement:

SELECT * FROM tables WHERE table_schema = 'your_database_name' AND table_name = 'users';

where, your_database_name is the name of the database to be queried.

By querying the columns table, you can obtain the column information of the specified table. For example, to query the table structure named users, you can execute the following statement:

SELECT * FROM columns WHERE table_schema = 'your_database_name' AND table_name = 'users';

In addition to the above three methods, you can also query the table structure through other MySQL client tools, ORM frameworks, etc. Different tools and frameworks provide different query methods and display forms, and you can choose the appropriate query method according to specific needs.

To sum up, you can use DESCRIBE statement, SHOW COLUMNS statement, query information_schema database and other methods to query the MySQL table structure. Depending on the specific needs, choosing the appropriate method can easily obtain the structural information of the table.

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