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In MySQL, the DESC command is used to describe the table structure. It displays information about the table or view column by column, including field names, data types, whether null values are allowed, default values, and key constraints. It helps determine the type of data stored in a table, find primary key and foreign key constraints, and understand the overall layout and relationships of the table.
The meaning of DESC in MySQL
In the MySQL database, the DESC
command is used Describes the structure of a database table or view. It displays column-by-column information about a table or view in a readable form.
Syntax
<code>DESC <表名|视图名>;</code>
Output content
DESC
The output of the command usually contains the following information:
Usage
DESC
The command is database An important tool for administrators and developers to understand the structure of a table or view. It helps:
Example
To view the structure of the customers
table, you can use the following command:
<code>DESC customers;</code>
The output will display the following information:
<code>Field Type Null Key Default Extra id int(11) NO PRI NULL auto_increment name varchar(255) YES MUL NULL email varchar(255) YES MUL NULL phone_number varchar(20) YES MUL NULL </code>
This indicates that the customers
table has four fields: id
, name
, email
and phone_number
. The id
field is the primary key, and the name
, email
, and phone_number
fields allow null values. The id
field uses the auto_increment
attribute, which means that newly inserted rows will automatically be assigned an incrementing integer as the id
value.
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