A list display field
show columns
from table_name；
About use and show
Original link: https://blog.csdn.net/rex_wust/article/details/80409444
When you initially connect to MySQL, there is no database open for you to use. Before you can perform any database operations, you need to select a database.
To do this, use the USE keyword.
PS key (key word) as a reserved word MySQL language part of the composition. Never use keywords to name a table or column
(1) returns a list of available databases, enter:
SHOW DATABASES;
(2) In order to use crashcourse database, you should enter the following:
USE crashcourse;
Remember, you must first open the USE database in order to read the data.
List (3) returns the currently selected database of available tables, may be used
SHOW TABLES;
In the present embodiment, showing the table in the database crashcourse:
(4) SHOW table columns may be used to display, enter:
SHOW COLUMNS FROM customers;
SHOW COLUMNS required to give a table name (FROM customers in this example), it returns a row for each field, the row contains the field name, data
Types, whether to allow NULL, the key information, default values, and other information (e.g., the field cust_id auto_increment).