mysql introductory statement:
View at the library server
show databases;
Create a library (database was created after its name is not changed)
create database database name;
2.1. Look inserted library is currently located
select database()；
Delete a library
drop database database name;
drop database database name IF EXISTS
database name drop database if exists;
Select the specified library
use database name;
The simplest construction of the table statement
create table msg (
Column 1 Column name Type 1,
Column 2 Column name Type 2
);
例如：create table msg(
name varchar(4),
age int
)charset utf8;
View library table
show tables; or show tables from the database name;
5.1. Interposed watch structure
desc table name;
5.2. Plug see all the data in the table
select * from 表名;
Delete table
drop table 表名;
drop talbe if exists 表名；
Change the name of the table
alter table table name rename to new table name;
View table structure
desc table name;
View the current version of the database
Method 1: Administrator Command Prompt window and have logged in to the MySQL server, enter the command: select version ();
Method 2: Sign out of the database server, the administrator at the command prompt, enter the command: mysql --version; or mysql -V;
Declaration character set
The default table built using the utf-8, but we are using in the Windows window is GBK, it is necessary to use the character set declaration.
set names gbk;
Note: If, after the current statement is wrong should denounce this statement, while continuing to fight the new statement (quit this statement: \ c)
MySQL basic operations
increased
insert into table
(Column 1, column 2, column 3)
values
; (Value column 1, column 2 value, the value of column 3)
1
2
3
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of a column inserted in row
insert into msg / ** determination table ** /
(name, Age) / ** ** determine the column /
values
/ determination value ** ** /; ( 'John Doe', 18)
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2
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fully inserted line column (at which time all columns must be assigned, includes a primary key)
MSG INTO INSERT
values
( 'John Doe', 12);
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2
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inserted into a plurality of rows
MSG INTO INSERT
values
( 'Zhao six', 20),
( 'Bob', 25),
( 'red', 22);
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2
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puncturing
delete from table / determination table ** ** /
WHERE condition / ** certain conditions ** /
1
2
the delete from the table name (deleting the entire table)
Note: For a delete operation is to remove columns in a row of data does not exist, that is to remove the lowest per row deleted.
Change
update table / determination table ** ** /
SET = Column 1 Column 1 value / values ** ** determine the column and /
2 = value 2 columns, column
where conditions; / determination condition ** ** /
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2
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edit a piece of data to meet the conditions
MSG Update
SET Age = 89,
WHERE name = 'John Doe';
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2
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search
query an entire table:
select * from 表名;
Queries to meet the conditions of a column
select a column name, a column name table where 2 from the filter criteria;
Queries to meet the conditions of a row
select * from 表名 where age > 12;
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