Check structure of table in MySQL database

Check the DDL or Structure of columns in table in MySQL

Check Structure of table with Describe command

mysql> use world

mysql> desc city;
+-------------+----------+------+-----+---------+----------------+
| Field       | Type     | Null | Key | Default | Extra          |
+-------------+----------+------+-----+---------+----------------+
| ID          | int      | NO   | PRI | NULL    | auto_increment |
| Name        | char(35) | NO   |     |         |                |
| CountryCode | char(3)  | NO   | MUL |         |                |
| District    | char(20) | NO   |     |         |                |
| Population  | int      | NO   |     | 0       |                |
+-------------+----------+------+-----+---------+----------------+
5 rows in set (0.01 sec)

Check Data definition language (DDL) of table

mysql> show create table city;

----------------------------------------------------------------------------
| Table | Create Table    
----------------------------------------------------------------------------
| city  | CREATE TABLE `city` (
  `ID` int NOT NULL AUTO_INCREMENT,
  `Name` char(35) NOT NULL DEFAULT '',
  `CountryCode` char(3) NOT NULL DEFAULT '',
  `District` char(20) NOT NULL DEFAULT '',
  `Population` int NOT NULL DEFAULT '0',
  PRIMARY KEY (`ID`),
  KEY `CountryCode` (`CountryCode`),
  CONSTRAINT `city_ibfk_1` FOREIGN KEY (`CountryCode`) REFERENCES `country` (`Code`)
) ENGINE=InnoDB AUTO_INCREMENT=4080 DEFAULT CHARSET=latin1 |
----------------------------------------------------------------------------
1 row in set (0.01 sec)

1 thought on “Check structure of table in MySQL database

  1. Marc

    Could someone please explain to me what is the meaning of KEY that comes after the PRIMARY KEY in DDL (this one -> KEY `CountryCode` (`CountryCode`)) , what does it do? Thanks in advance.

    Like

    Reply

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