The basic operation of mysql statement 04/27 Update SLTechnology News&Howtos

The basic operation of mysql statement

2025-04-27 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >

Shulou(Shulou.com)06/01 Report--

Practice environment: operate directly in the production environment

OS:CentOS6.8

The specific operation procedure is as follows:

Last login: Wed Aug 10 08:07:15 2016 from *

Welcome to * CentOS server!

[sky@sky9896] $mysql-u root-p

Enter password:

Welcome to the MySQL monitor. Commands end with; or\ g.

Your MySQL connection id is 114094

Server version: 5.5.49-cll-lve MySQL Community Server (GPL) by Atomicorp

Oracle is a registered trademark of Oracle Corporation and/or its

Affiliates. Other names may be trademarks of their respective

Owners.

Type 'help;' or'\ h' for help. Type'\ c'to clear the current input statement.

Mysql > create database a # create database a

Query OK, 1 row affected (0.08 sec)

Mysql > show databases; # shows all databases

+-+

| | Database |

+-+

| | information_schema |

| | a |

| | back20150625ultrax |

| | cacti |

| | cacti20151220 |

| | cacti20160104 |

| | feifeicms |

| | mysql |

| | performance_schema |

| | phpcom |

| | study |

| | syslog |

| | test |

| | test1 |

| | tt |

| | ultrax |

+-+

16 rows in set (0.16 sec)

Mysql > use a # Open the database

Database changed

Mysql > show tables

Empty set (0.00 sec)

Mysql > create table A1 (id int); # create A1 table

Query OK, 0 rows affected (0.22 sec)

Mysql > show tables; # shows all tables

+-+

| | Tables_in_a |

+-+

| | A1 |

+-+

1 row in set (0.00 sec)

Mysql > describe A1 # display table structure

+-+ +

+-+ +

| | id | int (11) | YES | | NULL |

+-+ +

1 row in set (0.00 sec)

Mysql > show engines; # View engine

+-- +

+-- +

| | MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO | |

| | CSV | YES | CSV storage engine | NO | NO | NO | |

| | MyISAM | YES | MyISAM storage engine | NO | NO | NO | |

| | BLACKHOLE | YES | / dev/null storage engine (anything you write to it disappears) | NO | NO | NO |

| | MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |

| | InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |

| | ARCHIVE | YES | Archive storage engine | NO | NO | NO | |

| | PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO | |

+-- +

9 rows in set (0.00 sec)

[sky@sky9896 ~] $mysql-u root-p # Connect to the database

Welcome to the MySQL monitor. Commands end with; or\ g.

Your MySQL connection id is 114209

Server version: 5.5.49-cll-lve MySQL Community Server (GPL) by Atomicorp

Oracle is a registered trademark of Oracle Corporation and/or its

Affiliates. Other names may be trademarks of their respective

Owners.

Type 'help;' or'\ h' for help. Type'\ c'to clear the current input statement.

Mysql > exit # exit

Bye

Mysql > use a

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with-A

Database changed

Mysql > create table a2 (

-> id int unsigned not null auto_increment, # cannot be empty. Increase the value automatically.

-> name char (40) not null default', # cannot be empty. Default is empty.

-> info char (200) null

-> primary key (id); # set id as the primary key

Query OK, 0 rows affected (0.12 sec)

Mysql > describe a2

+-+ +

+-+ +

| | id | int (10) unsigned | NO | PRI | NULL | auto_increment |

+-+ +

3 rows in set (0.00 sec)

Mysql > show tables

+-+

| | Tables_in_a |

+-+

| | A1 |

| | a2 |

+-+

2 rows in set (0.00 sec)

Mysql > insert into a2 (id,name,info) values

Query OK, 1 row affected, 1 warning (0.07 sec)

Mysql > select * from a2

+-- +

+-- +

| | 1 | wuhaiming |? |

+-- +

1 row in set (0.00 sec)

Mysql > select id from a2

+-- +

| | id |

+-- +

| | 1 |

+-- +

1 row in set (0.00 sec)

Mysql > insert into a2 values (2)

Query OK, 1 row affected (0.04 sec)

Mysql > select * from a2

+-- +

+-- +

| | 1 | wuhaiming |? |

| | 2 | a2 | sky9890 |

+-- +

2 rows in set (0.00 sec)

Mysql > insert into a2 (id,name) values (', 'whm')

Query OK, 1 row affected, 1 warning (0.06 sec)

Mysql > select * from a2

+-- +

+-- +

| | 1 | wuhaiming |? |

| | 2 | a2 | sky9890 |

| | 3 | whm | NULL |

+-- +

3 rows in set (0.00 sec)

Mysql > describe a2

+-+ +

+-+ +

| | id | int (10) unsigned | NO | PRI | NULL | auto_increment |

+-+ +

3 rows in set (0.00 sec)

Mysql > insert into a2 values ('','a6 recording, recording sky9890'), (','a7 recording,); # insert a record

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near')'at line 1

Mysql > insert into a2 values ('','a6 records memory sky9890'), (','a7 records values); # insert two records in a row

Query OK, 2 rows affected, 2 warnings (0.17 sec)

Records: 2 Duplicates: 0 Warnings: 2

Mysql > select * from a2

+-- +

+-- +

| | 1 | wuhaiming |? |

| | 2 | a2 | sky9890 |

| | 3 | whm | NULL |

| | 4 | A6 | sky9890 |

| | 5 | A7 | sky |

+-- +

5 rows in set (0.00 sec)

Mysql > describe A1

+-+ +

+-+ +

| | id | int (11) | YES | | NULL |

+-+ +

1 row in set (0.00 sec)

Mysql > describe a2

+-+ +

+-+ +

| | id | int (10) unsigned | NO | PRI | NULL | auto_increment |

+-+ +

3 rows in set (0.00 sec)

Mysql > select * from A1

Empty set (0.00 sec)

Mysql > insert into A1 (id) select id from a2

Query OK, 5 rows affected (0.06 sec)

Records: 5 Duplicates: 0 Warnings: 0

Mysql > select * from A1

+-+

| | id |

+-+

| | 1 |

| | 2 |

| | 3 |

| | 4 |

| | 5 |

+-+

5 rows in set (0.00 sec)

Mysql > select * from a2

+-- +

+-- +

| | 1 | wuhaiming |? |

| | 2 | a2 | sky9890 |

| | 3 | whm | NULL |

| | 4 | A6 | sky9890 |

| | 5 | A7 | sky |

+-- +

5 rows in set (0.00 sec)

Mysql > show databases

+-+

| | Database |

+-+

| | information_schema |

| | a |

| | back20150625ultrax |

| | cacti |

| | cacti20151220 |

| | cacti20160104 |

| | feifeicms |

| | mysql |

| | performance_schema |

| | phpcom |

| | study |

| | syslog |

| | test |

| | test1 |

| | tt |

| | ultrax |

+-+

16 rows in set (0.00 sec)

Mysql > drop database b; # Delete b database

ERROR 1008 (HY000): Can't drop database 'b'; database doesn't exist

Mysql > show tables

+-+

| | Tables_in_a |

+-+

| | A1 |

| | a2 |

+-+

2 rows in set (0.00 sec)

Mysql > drop tables A1 position # Delete A1 table

Query OK, 0 rows affected (0.09 sec)

Mysql > show tables

+-+

| | Tables_in_a |

+-+

| | a2 |

+-+

1 row in set (0.00 sec)

Mysql > delete from a2 where id=5 or info='sky'; # Delete a record

Query OK, 1 row affected (0.05sec)

Mysql > select * from a2

+-- +

+-- +

| | 1 | wuhaiming |? |

| | 2 | a2 | sky9890 |

| | 3 | whm | NULL |

| | 4 | A6 | sky9890 |

+-- +

4 rows in set (0.00 sec)

Mysql > update a2 set info='sky' where id=1; # update a field value

Query OK, 1 row affected (0.07 sec)

Rows matched: 1 Changed: 1 Warnings: 0

Mysql > select * from a2

+-- +

+-- +

| | 1 | wuhaiming | sky |

| | 2 | a2 | sky9890 |

| | 3 | whm | NULL |

| | 4 | A6 | sky9890 |

+-- +

4 rows in set (0.00 sec)

Mysql > SHOW VARIABLES LIKE 'character%'

+-+

| | Variable_name | Value |

+-+

| | character_set_client | utf8 |

| | character_set_connection | utf8 |

| | character_set_database | latin1 |

| | character_set_filesystem | binary |

| | character_set_results | utf8 |

| | character_set_server | latin1 |

| | character_set_system | utf8 |

| | character_sets_dir | / usr/share/mysql/charsets/ |

+-+

8 rows in set (0.00 sec)

Mysql > SET collation_database = utf8

ERROR 1273 (HY000): Unknown collation: 'utf8'

Mysql > set character_set_database=utf8

Query OK, 0 rows affected (0.00 sec)

Mysql > update a2 set info=' Wu Haiming 'where id=1

Query OK, 1 row affected, 1 warning (0.06 sec)

Rows matched: 1 Changed: 1 Warnings: 1

Mysql > select * from a2

+-- +

+-- +

| | 1 | wuhaiming |? |

| | 2 | a2 | sky9890 |

| | 3 | whm | NULL |

| | 4 | A6 | sky9890 |

+-- +

4 rows in set (0.00 sec)

Mysql > alter table a2 rename A1 # modify the table name

Query OK, 0 rows affected (0.06 sec)

Mysql > show tables

+-+

| | Tables_in_a |

+-+

| | A1 |

+-+

1 row in set (0.00 sec)

Mysql > select * from a2

ERROR 1146 (42S02): Table 'a.a2' doesn't exist

Mysql > select * from a2

ERROR 1146 (42S02): Table 'a.a2' doesn't exist

Mysql > select * from A1

+-- +

+-- +

| | 1 | wuhaiming |? |

| | 2 | a2 | sky9890 |

| | 3 | whm | NULL |

| | 4 | A6 | sky9890 |

+-- +

4 rows in set (0.00 sec)

Mysql > alter table A1 change info information char; # change the field name

Query OK, 4 rows affected (0.26 sec)

Records: 4 Duplicates: 0 Warnings: 0

Mysql > describe A1

+-+ +

+-+ +

| | id | int (10) unsigned | NO | PRI | NULL | auto_increment |

+-+ +

3 rows in set (0.00 sec)

Mysql > alter table A1 add time date;# add columns at the end

Query OK, 4 rows affected (0.26 sec)

Records: 4 Duplicates: 0 Warnings: 0

Mysql > describe A1

+-+ +

+-+ +

| | id | int (10) unsigned | NO | PRI | NULL | auto_increment |

+-+ +

4 rows in set (0.00 sec)

Mysql > alter table A1 drop time; # delete column

Query OK, 4 rows affected (0.26 sec)

Records: 4 Duplicates: 0 Warnings: 0

Mysql > describe A1

+-+ +

+-+ +

| | id | int (10) unsigned | NO | PRI | NULL | auto_increment |

+-+ +

3 rows in set (0.00 sec)

Mysql > alter table A1 add time date first;# is inserted into the first column

Query OK, 4 rows affected (0.24 sec)

Records: 4 Duplicates: 0 Warnings: 0

Mysql > describe A1

+-+ +

+-+ +

| | id | int (10) unsigned | NO | PRI | NULL | auto_increment |

+-+ +

4 rows in set (0.00 sec)

Mysql > select * from A1

+-+

+-+

| | NULL | 1 | wuhaiming |? |

| | NULL | 2 | a2 | sky9890 |

| | NULL | 3 | whm | NULL | |

| | NULL | 4 | A6 | sky9890 | |

+-+

4 rows in set (0.00 sec)

Mysql > alter table A1 add nian year after time;# is inserted into the specified column

Query OK, 4 rows affected (0.25 sec)

Records: 4 Duplicates: 0 Warnings: 0

Mysql > describe A1

+-+ +

+-+ +

| | id | int (10) unsigned | NO | PRI | NULL | auto_increment |

+-+ +

5 rows in set (0.00 sec)

Mysql > grant all on cacti.* to 'a1 license license localhost 'identified by' 123456 authorization

Query OK, 0 rows affected (0.02 sec)

Mysql > exit

Bye

Mysql > grant create,select on *. * to 'a2 licensed localhost 'identified by' 123; # authorization

Query OK, 0 rows affected (0.00 sec)

Mysql > revoke select on *. * from 'a2permission withdrawing permission

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