sql 基础--mysql 5

mysql5.6 安装 http://jingyan.baidu.com/article/f3ad7d0ffc061a09c3345bf0.html

md中输入:net start mysql,服务启动成功

mysql -u root -p（第一次登录没有密码，直接按回车过）,登录成功！

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)

mysql> use mysql
Database changed
mysql> show tables;
+---------------------------+
| Tables_in_mysql |
+---------------------------+
| columns_priv |
| db |
| event |
| func |
| general_log |
| help_category |
| help_keyword |
| help_relation |
| help_topic |
| innodb_index_stats |
| innodb_table_stats |
| ndb_binlog_index |
| plugin |
| proc |
| procs_priv |
| proxies_priv |
| 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 |
+---------------------------+
28 rows in set (0.00 sec)

　　

时间： 2024-10-10 20:37:52

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15.组合查询 union mysql> select uid,first_name,price from pw_price where uid >2 union select uid,first_name,price from pw_price where price>=1000; +-----+------------+-------+ | uid | first_name | price | +-----+------------+-------+ | 3 | li | 2000

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14.高级联结表 使用别名 mysql> select uid as u,name as n,msg as m from pw_luck; +----+-----------+------+ | u | n | m | +----+-----------+------+ | 0 | Wilson | 100 | | 1 | zhangsan | 100 | | 2 | lisi | 1001 | | 3 | wang5 | 1001 | | 7 | zhangsan7 | 1000 | | 8

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