1.使用USE打开数据库
2.USE test 打开test数据库，检验数据库是否打开，输入SELECT DATABASE();
3.创建数据表
mysql> CREATE TABLE tb1(
-> username VARCHAR(20),
-> age TINYINT UNSIGNED,
-> salary FLOAT(8,2) UNSIGNED
-> );
Query OK, 0 rows affected (0.52 sec)
5.创建完毕，然后展示数据表
mysql> SHOW TABLES;
+----------------+
| Tables_in_test |
+----------------+
| tb1 |
+----------------+
1 row in set (0.06 sec)
展示数据库里所有的数据表
mysql> SHOW TABLES FROM mysql;
+---------------------------+
| Tables_in_mysql |
+---------------------------+
| columns_priv |
| component |
| db |
| default_roles |
| engine_cost |
| func |
| general_log |
| global_grants |
| gtid_executed |
| help_category |
| help_keyword |
| help_relation |
| help_topic |
| innodb_index_stats |
| innodb_table_stats |
| password_history |
| plugin |
| procs_priv |
| proxies_priv |
| role_edges |
| server_cost |
| servers |
| slave_master_info |
| slave_relay_log_info |
| slave_worker_info |
| slow_log |
| tables_priv |
| time_zone |
| time_zone_leap_second |
| time_zone_name |
| time_zone_transition |
| time_zone_transition_type |
| user |
+---------------------------+
33 rows in set (0.00 sec)
6.查看数据表的结构
命令SHOW COLUMNS FROM tb1;
mysql> SHOW COLUMNS FROM test;
ERROR 1146 (42S02): Table 'test.test' doesn't exist
mysql> SHOW COLUMNS FROM tb1;
+----------+---------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+---------------------+------+-----+---------+-------+
| username | varchar(20) | YES | | NULL | |
| age | tinyint(3) unsigned | YES | | NULL | |
| salary | float(8,2) unsigned | YES | | NULL | |
+----------+---------------------+------+-----+---------+-------+
3 rows in set (0.04 sec)