MySQL数据类型以及基本使用详解

 1 mysql> status
 2 --------------
 3 mysql  Ver 14.14 Distrib 5.5.54, for linux2.6 (x86_64) using readline 5.1
 4 
 5 Connection id:          4
 6 Current database:
 7 Current user:           root@localhost
 8 SSL:                    Not in use
 9 Current pager:          stdout
10 Using outfile:          ‘‘
11 Using delimiter:        ;
12 Server version:         5.5.54-log MySQL Community Server (GPL)
13 Protocol version:       10
14 Connection:             Localhost via UNIX socket
15 Server characterset:    latin1
16 Db     characterset:    latin1
17 Client characterset:    utf8
18 Conn.  characterset:    utf8
19 UNIX socket:            /tmp/mysql.sock
20 Uptime:                 49 min 43 sec
21 
22 Threads: 1  Questions: 11  Slow queries: 0  Opens: 33  Flush tables: 1  Open tables: 26  Queries per second avg: 0.003
23 --------------
24 
25 mysql> 

 1 [root@yinzhengjie ~]# mysql -u root -p123
 2 Welcome to the MySQL monitor.  Commands end with ; or \g.
 3 Your MySQL connection id is 6
 4 Server version: 5.5.54-log MySQL Community Server (GPL)
 5 
 6 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 7 
 8 Oracle is a registered trademark of Oracle Corporation and/or its
 9 affiliates. Other names may be trademarks of their respective
10 owners.
11 
12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
13 
14 mysql> \q
15 Bye
16 [root@yinzhengjie ~]# 

 1 [root@yinzhengjie ~]# mysql -u root -p123
 2 Welcome to the MySQL monitor.  Commands end with ; or \g.
 3 Your MySQL connection id is 7
 4 Server version: 5.5.54-log MySQL Community Server (GPL)
 5 
 6 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 7 
 8 Oracle is a registered trademark of Oracle Corporation and/or its
 9 affiliates. Other names may be trademarks of their respective
10 owners.
11 
12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
13 
14 mysql> \?
15 
16 For information about MySQL products and services, visit:
17    http://www.mysql.com/
18 For developer information, including the MySQL Reference Manual, visit:
19    http://dev.mysql.com/
20 To buy MySQL Enterprise support, training, or other products, visit:
21    https://shop.mysql.com/
22 
23 List of all MySQL commands:
24 Note that all text commands must be first on line and end with ‘;‘
25 ?         (\?) Synonym for `help‘.
26 clear     (\c) Clear the current input statement.
27 connect   (\r) Reconnect to the server. Optional arguments are db and host.
28 delimiter (\d) Set statement delimiter.
29 edit      (\e) Edit command with $EDITOR.
30 ego       (\G) Send command to mysql server, display result vertically.
31 exit      (\q) Exit mysql. Same as quit.
32 go        (\g) Send command to mysql server.
33 help      (\h) Display this help.
34 nopager   (\n) Disable pager, print to stdout.
35 notee     (\t) Don‘t write into outfile.
36 pager     (\P) Set PAGER [to_pager]. Print the query results via PAGER.
37 print     (\p) Print current command.
38 prompt    (\R) Change your mysql prompt.
39 quit      (\q) Quit mysql.
40 rehash    (\#) Rebuild completion hash.
41 source    (\.) Execute an SQL script file. Takes a file name as an argument.
42 status    (\s) Get status information from the server.
43 system    (\!) Execute a system shell command.
44 tee       (\T) Set outfile [to_outfile]. Append everything into given outfile.
45 use       (\u) Use another database. Takes database name as argument.
46 charset   (\C) Switch to another charset. Might be needed for processing binlog with multi-byte charsets.
47 warnings  (\W) Show warnings after every statement.
48 nowarning (\w) Don‘t show warnings after every statement.
49 
50 For server side help, type ‘help contents‘
51 
52 mysql> 

 1 [root@yinzhengjie ~]# mysql -u root -p123
 2 Welcome to the MySQL monitor.  Commands end with ; or \g.
 3 Your MySQL connection id is 8
 4 Server version: 5.5.54-log MySQL Community Server (GPL)
 5 
 6 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 7 
 8 Oracle is a registered trademark of Oracle Corporation and/or its
 9 affiliates. Other names may be trademarks of their respective
10 owners.
11 
12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
13 
14 mysql> 
15 mysql> select user()\g
16 +----------------+
17 | user()         |
18 +----------------+
19 | root@localhost |
20 +----------------+
21 1 row in set (0.00 sec)
22 
23 mysql> 

 1 [root@yinzhengjie ~]# mysql -u root -p123
 2 Welcome to the MySQL monitor.  Commands end with ; or \g.
 3 Your MySQL connection id is 10
 4 Server version: 5.5.54-log MySQL Community Server (GPL)
 5 
 6 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 7 
 8 Oracle is a registered trademark of Oracle Corporation and/or its
 9 affiliates. Other names may be trademarks of their respective
10 owners.
11 
12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
13 
14 mysql> use mysql
15 Database changed
16 mysql> select User,Host,Password from user;
17 +------+-------------+-------------------------------------------+
18 | User | Host        | Password                                  |
19 +------+-------------+-------------------------------------------+
20 | root | localhost   | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
21 | root | yinzhengjie | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
22 | root | 127.0.0.1   | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
23 | root | ::1         | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
24 |      | localhost   |                                           |
25 |      | yinzhengjie |                                           |
26 +------+-------------+-------------------------------------------+
27 6 rows in set (0.00 sec)
28 
29 mysql> 
30 mysql> select User,Host,Password from user\G
31 *************************** 1. row ***************************
32     User: root
33     Host: localhost
34 Password: *23AE809DDACAF96AF0FD78ED04B6A265E05AA257
35 *************************** 2. row ***************************
36     User: root
37     Host: yinzhengjie
38 Password: *23AE809DDACAF96AF0FD78ED04B6A265E05AA257
39 *************************** 3. row ***************************
40     User: root
41     Host: 127.0.0.1
42 Password: *23AE809DDACAF96AF0FD78ED04B6A265E05AA257
43 *************************** 4. row ***************************
44     User: root
45     Host: ::1
46 Password: *23AE809DDACAF96AF0FD78ED04B6A265E05AA257
47 *************************** 5. row ***************************
48     User: 
49     Host: localhost
50 Password: 
51 *************************** 6. row ***************************
52     User: 
53     Host: yinzhengjie
54 Password: 
55 6 rows in set (0.00 sec)
56 
57 mysql> 

 1 [root@yinzhengjie ~]# mysql -u root -p123
 2 Welcome to the MySQL monitor.  Commands end with ; or \g.
 3 Your MySQL connection id is 11
 4 Server version: 5.5.54-log MySQL Community Server (GPL)
 5 
 6 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 7 
 8 Oracle is a registered trademark of Oracle Corporation and/or its
 9 affiliates. Other names may be trademarks of their respective
10 owners.
11 
12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
13 
14 mysql> select \c
15 mysql> 
16 mysql> show databases;
17 +--------------------+
18 | Database           |
19 +--------------------+
20 | information_schema |
21 | mysql              |
22 | performance_schema |
23 | test               |
24 +--------------------+
25 4 rows in set (0.01 sec)
26 
27 mysql> 
28 mysql> sdas sad as \c
29 mysql> 
30 mysql> 

 1 [root@yinzhengjie ~]# mysql -u root -p123
 2 Welcome to the MySQL monitor.  Commands end with ; or \g.
 3 Your MySQL connection id is 16
 4 Server version: 5.5.54-log MySQL Community Server (GPL)
 5 
 6 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 7 
 8 Oracle is a registered trademark of Oracle Corporation and/or its
 9 affiliates. Other names may be trademarks of their respective
10 owners.
11 
12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
13 
14 mysql> show databases;
15 +--------------------+
16 | Database           |
17 +--------------------+
18 | information_schema |
19 | mysql              |
20 | performance_schema |
21 | test               |
22 +--------------------+
23 4 rows in set (0.00 sec)
24 
25 mysql> \umysql
26 Database changed
27 mysql> 
28 mysql> use mysql
29 Database changed
30 mysql> 

 1 mysql> select user();            #查看数据库的用户信息。
 2 +----------------+
 3 | user()         |
 4 +----------------+
 5 | root@localhost |
 6 +----------------+
 7 1 row in set (0.02 sec)
 8 
 9 mysql> 
10 mysql> select current_time();      #查看当前操作系统的时间。
11 +----------------+
12 | current_time() |
13 +----------------+
14 | 00:25:33       |
15 +----------------+
16 1 row in set (0.00 sec)
17 
18 mysql>

 1 mysql> select 100+200;        #利用select做算术运算。
 2 +---------+
 3 | 100+200 |
 4 +---------+
 5 |     300 |
 6 +---------+
 7 1 row in set (0.00 sec)
 8 
 9 mysql>
10 mysql> select 5*6;
11 +-----+
12 | 5*6 |
13 +-----+
14 |  30 |
15 +-----+
16 1 row in set (0.00 sec)
17 
18 mysql> 

 1 mysql> show databases;
 2 +--------------------+
 3 | Database           |
 4 +--------------------+
 5 | information_schema |
 6 | mysql              |
 7 | performance_schema |
 8 | test               |
 9 +--------------------+
10 4 rows in set (0.00 sec)
11 
12 mysql> 

 1 mysql> use mysql      
 2 Database changed
 3 mysql> show tables;
 4 +---------------------------+
 5 | Tables_in_mysql           |
 6 +---------------------------+
 7 | columns_priv              |
 8 | db                        |
 9 | event                     |
10 | func                      |
11 | general_log               |
12 | help_category             |
13 | help_keyword              |
14 | help_relation             |
15 | help_topic                |
16 | host                      |
17 | ndb_binlog_index          |
18 | plugin                    |
19 | proc                      |
20 | procs_priv                |
21 | proxies_priv              |
22 | servers                   |
23 | slow_log                  |
24 | tables_priv               |
25 | time_zone                 |
26 | time_zone_leap_second     |
27 | time_zone_name            |
28 | time_zone_transition      |
29 | time_zone_transition_type |
30 | user                      |
31 +---------------------------+
32 24 rows in set (0.00 sec)
33 
34 mysql> 

 1 [root@yinzhengjie ~]# mysql -u root -p123
 2 Welcome to the MySQL monitor.  Commands end with ; or \g.
 3 Your MySQL connection id is 17
 4 Server version: 5.5.54-log MySQL Community Server (GPL)
 5 
 6 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 7 
 8 Oracle is a registered trademark of Oracle Corporation and/or its
 9 affiliates. Other names may be trademarks of their respective
10 owners.
11 
12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
13 
14 mysql> show databases;
15 +--------------------+
16 | Database           |
17 +--------------------+
18 | information_schema |
19 | mysql              |
20 | performance_schema |
21 | test               |
22 +--------------------+
23 4 rows in set (0.00 sec)
24 
25 mysql> create database yinzhengjie;
26 Query OK, 1 row affected (0.01 sec)
27 
28 mysql> show databases;
29 +--------------------+
30 | Database           |
31 +--------------------+
32 | information_schema |
33 | mysql              |
34 | performance_schema |
35 | test               |
36 | yinzhengjie        |
37 +--------------------+
38 5 rows in set (0.00 sec)
39 
40 mysql> 

 1 [root@yinzhengjie ~]# mysql -u root -p123
 2 Welcome to the MySQL monitor.  Commands end with ; or \g.
 3 Your MySQL connection id is 18
 4 Server version: 5.5.54-log MySQL Community Server (GPL)
 5 
 6 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 7 
 8 Oracle is a registered trademark of Oracle Corporation and/or its
 9 affiliates. Other names may be trademarks of their respective
10 owners.
11 
12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
13 
14 mysql> show databases;
15 +--------------------+
16 | Database           |
17 +--------------------+
18 | information_schema |
19 | mysql              |
20 | performance_schema |
21 | test               |
22 | yinzhengjie        |
23 +--------------------+
24 5 rows in set (0.00 sec)
25 
26 mysql> drop database yinzhengjie;
27 Query OK, 0 rows affected (0.01 sec)
28 
29 mysql> show databases;
30 +--------------------+
31 | Database           |
32 +--------------------+
33 | information_schema |
34 | mysql              |
35 | performance_schema |
36 | test               |
37 +--------------------+
38 4 rows in set (0.00 sec)
39 
40 mysql> 

 1 mysql> help select
 2 Name: ‘SELECT‘
 3 Description:
 4 Syntax:
 5 SELECT
 6     [ALL | DISTINCT | DISTINCTROW ]
 7       [HIGH_PRIORITY]
 8       [STRAIGHT_JOIN]
 9       [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT]
10       [SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS]
11     select_expr [, select_expr ...]
12     [FROM table_references
13     [WHERE where_condition]
14     [GROUP BY {col_name | expr | position}
15       [ASC | DESC], ... [WITH ROLLUP]]
16     [HAVING where_condition]
17     [ORDER BY {col_name | expr | position}
18       [ASC | DESC], ...]
19     [LIMIT {[offset,] row_count | row_count OFFSET offset}]
20     [PROCEDURE procedure_name(argument_list)]
21     [INTO OUTFILE ‘file_name‘
22         [CHARACTER SET charset_name]
23         export_options
24       | INTO DUMPFILE ‘file_name‘
25       | INTO var_name [, var_name]]
26     [FOR UPDATE | LOCK IN SHARE MODE]]
27 
28 SELECT is used to retrieve rows selected from one or more tables, and
29 can include UNION statements and subqueries. See [HELP UNION], and
30 http://dev.mysql.com/doc/refman/5.5/en/subqueries.html.
31 
32 The most commonly used clauses of SELECT statements are these:
33 
34 o Each select_expr indicates a column that you want to retrieve. There
35   must be at least one select_expr.
36 
37 o table_references indicates the table or tables from which to retrieve
38   rows. Its syntax is described in [HELP JOIN].
39 
40 o The WHERE clause, if given, indicates the condition or conditions
41   that rows must satisfy to be selected. where_condition is an
42   expression that evaluates to true for each row to be selected. The
43   statement selects all rows if there is no WHERE clause.
44 
45   In the WHERE expression, you can use any of the functions and
46   operators that MySQL supports, except for aggregate (summary)
47   functions. See
48   http://dev.mysql.com/doc/refman/5.5/en/expressions.html, and
49   http://dev.mysql.com/doc/refman/5.5/en/functions.html.
50 
51 SELECT can also be used to retrieve rows computed without reference to
52 any table.
53 
54 URL: http://dev.mysql.com/doc/refman/5.5/en/select.html
55 
56 
57 mysql> 

 1 [root@yinzhengjie ~]# mysql -u root -p123
 2 Welcome to the MySQL monitor.  Commands end with ; or \g.
 3 Your MySQL connection id is 17
 4 Server version: 5.5.54-log MySQL Community Server (GPL)
 5 
 6 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 7 
 8 Oracle is a registered trademark of Oracle Corporation and/or its
 9 affiliates. Other names may be trademarks of their respective
10 owners.
11 
12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
13 
14 mysql> show databases;
15 +--------------------+
16 | Database           |
17 +--------------------+
18 | information_schema |
19 | mysql              |
20 | performance_schema |
21 | test               |
22 +--------------------+
23 4 rows in set (0.00 sec)
24 
25 mysql> create database yinzhengjie;
26 Query OK, 1 row affected (0.01 sec)
27 
28 mysql> show databases;
29 +--------------------+
30 | Database           |
31 +--------------------+
32 | information_schema |
33 | mysql              |
34 | performance_schema |
35 | test               |
36 | yinzhengjie        |
37 +--------------------+
38 5 rows in set (0.00 sec)
39 
40 mysql> 

 1 [root@yinzhengjie ~]# more yinzhengjie.sql 
 2 select user();
 3 create database yinzhengjie;
 4 show databases;
 5 [root@yinzhengjie ~]# 
 6 [root@yinzhengjie ~]# mysql -uroot -p123 < yinzhengjie.sql 
 7 user()
 8 root@localhost
 9 Database
10 information_schema
11 mysql
12 performance_schema
13 test
14 yinzhengjie
15 [root@yinzhengjie ~]#