MySQL learning footprint record 01-SOURCE, SHOW

MySQL learning footprint record 01-SOURCE, SHOW 1. Import Data

  command:   SOURCE <PATH> <data.sql>; eg:   mysql> source ~/MyDoc/create.sql;

 

2. the shortcut for show columns from <table_name> is DESCRIBE <table_name>

  eg:    mysql> SHOW COLUMNS FROM orders;+------------+----------+------+-----+---------+----------------+| Field      | Type     | Null | Key | Default | Extra          |+------------+----------+------+-----+---------+----------------+| order_num  | int(11)  | NO   | PRI | NULL    | auto_increment || order_date | datetime | NO   |     | NULL    |                || cust_id    | int(11)  | NO   | MUL | NULL    |                |+------------+----------+------+-----+---------+----------------+mysql> DESCRIBE orders;+------------+----------+------+-----+---------+----------------+| Field      | Type     | Null | Key | Default | Extra          |+------------+----------+------+-----+---------+----------------+| order_num  | int(11)  | NO   | PRI | NULL    | auto_increment || order_date | datetime | NO   |     | NULL    |                || cust_id    | int(11)  | NO   | MUL | NULL    |                |+------------+----------+------+-----+---------+----------------+

 

3. Display Server Status Information

  command:      SHOW STATUS;   eg:     mysql> SHOW STATUS;+------------------------------------------+-------------+| Variable_name                            | Value       |+------------------------------------------+-------------+| Aborted_clients                          | 0           || Aborted_connects                         | 0           | ......... .........

 

4. Show the authorized users

  command:     SHOW GRANTS; eg:   mysql> SHOW GRANTS;+----------------------------------------------------------------------------------------------------------------------------------------+| Grants for root@localhost     ....... .......

 

5. Display Error Information

  command:     SHOW ERRORS; eg:   mysql> SHOW ERRORS;+-------+------+----------------------------------------------------------------------------------------------------------------------------------------------------+| Level | Code | Message     ....... .......

 

6. display warning information

  command:     SHOW WARMMINGS; eg:   mysql> SHOW WARMMINGS;ERROR 1064 (42000): You have an error in your SQL syntax;  ....... .......

 

7. Display statements for creating a specific database

  command:        SHOW CREATE DATABASE <database_name>;   eg:     mysql> SHOW CREATE DATABASE MySQL_ex;+----------+---------------------------------------------------------------------+| Database | Create Database                                                     |+----------+---------------------------------------------------------------------+| MySQL_ex | CREATE DATABASE `MySQL_ex` /*!40100 DEFAULT CHARACTER SET latin1 */ |+----------+---------------------------------------------------------------------+1 row in set (0.00 sec)

 

8. display the statement for creating a specific table

  command:        SHOW CREATE TABLE <database_name>;   eg:     mysql> SHOW CREATE TABLE orders;+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+| Table  | Create Table                                                                                                                                                                                                                                                                                                                                                           |+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+| orders | CREATE TABLE `orders` (  `order_num` int(11) NOT NULL AUTO_INCREMENT,  `order_date` datetime NOT NULL,  `cust_id` int(11) NOT NULL,  PRIMARY KEY (`order_num`),  KEY `fk_orders_customers` (`cust_id`),  CONSTRAINT `fk_orders_customers` FOREIGN KEY (`cust_id`) REFERENCES `customers` (`cust_id`)) ENGINE=InnoDB AUTO_INCREMENT=20010 DEFAULT CHARSET=latin1 | ....

 

9. Other SHOW commands help show;