The DESCRIBE command in MySQL is used to obtain the metadata information of the table, including: field name, data type, length, whether to allow null values, default value, and key. It returns a result set containing details about the table structure, column types, constraints, and indexes.
DESCRIBE Command in MySQL
DESCRIBE command is used to get metadata information about the tables in the database, e.g. Table structure, column types, constraints and indexes.
Syntax
<code>DESCRIBE <表名>;</code>
Usage
When the DESCRIBE command is executed, it returns a result set containing information about the specified table The following information:
Example
Let us use the DESCRIBE command to get metadata information about a table named "customers":
<code>DESCRIBE customers;</code>
Output results Similar to:
<code>Field | Type | Null | Key | Default | Extra -------+-------------+------+-----+---------+------ id | int(11) | NO | PRI | NULL | auto_increment name | varchar(255) | NO | | NULL | email | varchar(255) | NO | | NULL |</code>
This output means:
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