SQL基础

登录mysql服务器 mystql -u root [-h hostname or ipaddr]-p

显示已有数据库：show databases;

选择数据库:use name_of_database;

创建数据库:create name_of_database;

显示当前数据库所包含的表:show tables;

创建表：create name_of_table

(

　　name_of_line   data_class,  -data_class can be int varchar(255),etc

　　name_of_line   data_class,

　　,

　　,

)

;

显示表的内容：

select * from name_of_table;

显示表中某列的内容：

select name_of_line [,name_of_line] from name_of_table;

不重复的显示表中内容：

select distinct * from name_of_table;

排序显示表中内容：

select * from name_of_table order by name_of_line [desc];

选择给定约束的内容：

select * from name_of_table where name_of_line < some_value;

向表中插入值

insert into name_of_table value(value_of_line1,value_of_line2,,,);

更新表中的值

update name_of_table set name_of_line=value_of_line where name_of_otherline=value_of_otherline;

删除表中某条记录

delete from name_of_table where name_of_line=value_of_line;