MySql常用操作SQL语句汇总

Posted 2020-11-27

mysql的常见操作在这里先做一下总结，已经整合到代码里面，经过检验无误。
复制代码代码如下:

/创建一个数据库/
create database xuning_test;
/说明当时使用数据库对象/
use xuning_test;
/向数据库中添加表并且定义表的结构/
create table person(
id int not null,
name varchar(16) not null,
sex varchar(16) not null,
age int not null,
address varchar(128) not null,
remark varchar(512) not null
);
/向数据库的表中插入数据/
insert into person value
(1,‘name_1‘,‘men‘,99,‘beijing‘,‘This is a frindsheep boy‘),
(2,‘name_2‘,‘men‘,88,‘shanghai‘,‘ok great‘),
(1,‘name_3‘,‘man‘,77,‘guangzhou‘,‘This is lickly‘),
(1,‘name_4‘,‘men‘,66,‘beijing‘,‘This is a frindsheep boy‘),
(1,‘name_5‘,‘men‘,55,‘beijing‘,‘you dont going to shool‘),
(1,‘name_6‘,‘man‘,44,‘beijing‘,‘This is a frindsheep boy‘),
(1,‘name_7‘,‘men‘,33,‘beijing‘,‘This is a frindsheep boy‘),
(1,‘name_8‘,‘man‘,22,‘beijing‘,‘‘),
(1,‘name_9‘,‘men‘,11,‘beijing‘,‘This is a frindsheep boy‘)
;
/查询时否成功插入/
select from person;
/下面是多种查询方式/
/根据列的名称属性值/
select name from person;
/添加条件-根据性别/
select name from person where sex = ‘men‘;
/也可以用比较符作为条件--一定逗号隔开/
select name,address from person where age > 50;
/看做对象去使用数据库和表的关系=---双表关联--对象关系一定要明确/
select xuning_test.person.name, xuning_test.person.id, xuning_test.person.age, xuning_test.person.address
from xuning_test.person, test1.test_xuning
where xuning_test.person.id = test1.test_xuning.id
;
/使用表的别名进行查询*/
use xuning_test;
select c.name,sex from person as c where c.age > 40 and c.address=‘beijing‘;