创建/删除数据库
create database 数据库名 drop database 数据库名 use数据库
create table 表名() 列名 类型 限制 {
自增Identity(1,1) 非空 Not null
主键 建表时添加 primary key 已经创建好表之后新增约束
alter table 表名 add constraint PK_字段名--"PK"为主键的缩写，字段名为要在其上创建主键的字段名,\'PK_字段名\'就为约束名，primary key (字段名) --字段名同上
外键 建表时添加 foreign key references 表名（字段）已创建好表之后新增约束alter table 表名 add constraint FK_字段名--"FK"为外键的缩写，foreign key (字段名) references 关联的表名(关联的字段名) --注意\'关联的表名\'和\'关联的字段名\'
唯一 unique
drop table 表名
添加删除列 alert table 表名 add 列名 类型 限制 alter table 表名 drop column 列名
增insert into 表名 values（ , , ）
删delete from 表名 truncate table 表名：truncate table 表名
改update 表名 set 列名 = 值
}
建立student score course三个表
create database zuoye
use zuoye
create table student
(
sno varchar(20) not null,
sname varchar(20) not null,
ssex varchar(20) not null,
sbirthday datetime ,
class varchar(20) ,
)
insert into student values(\'108\',\'曾华\',\'男\',\'1977-09-01\',\'95033\')
insert into student values(\'105\',\'匡明\',\'男\',\'1975-10-02\',\'95031\')
insert into student values(\'107\',\'王丽\',\'女\',\'1976-01-23\',\'95033\')
insert into student values(\'101\',\'李军\',\'男\',\'1976-02-20\',\'95033\')
insert into student values(\'109\',\'王芳\',\'女\',\'1975-02-10\',\'95031\')
insert into student values(\'103\',\'陆君\',\'男\',\'1974-06-03\',\'95031\')
select *from student
create table course
(
cno varchar(20) not null,
cname varchar(20) not null,
tno varchar(20) not null,
)
insert into course values(\'3-105\',\'计算机导论\',\'825\')
insert into course values(\'3-245\',\'操作系统\',\'804\')
insert into course values(\'6-166\',\'数字电路\',\'856\')
insert into course values(\'9-888\',\'高等数学\',\'831\')
select *from course
create table score
(
sno varchar(20) not null,
cno varchar(20) not null,
degree decimal(4,1),
)
insert into score values(\'103\',\'3-245\',86)
insert into score values(\'105\',\'3-245\',75)
insert into score values(\'109\',\'3-245\',68)
insert into score values(\'103\',\'3-105\',92)
insert into score values(\'105\',\'3-105\',88)
insert into score values(\'109\',\'3-105\',76)
insert into score values(\'101\',\'3-105\',64)
insert into score values(\'107\',\'3-105\',91)
insert into score values(\'108\',\'3-105\',78)
insert into score values(\'101\',\'6-166\',85)
insert into score values(\'107\',\'6-166\',79)
insert into score values(\'108\',\'6-166\',81)
select *from score
create table teacher
(
tno varchar(20) not null,
tname varchar(20) not null,
tsex varchar(20) not null,
tbirthday datetime ,
prof varchar(20),
depart varchar(20) not null,
)
insert into teacher values(\'804\',\'李诚\',\'男\',\'1958-12-02\',\'副教授\',\'计算机系\')
insert into teacher values(\'856\',\'张旭\',\'男\',\'1969-03-12\',\'讲师\',\'电子工程系\')
insert into teacher values(\'825\',\'王萍\',\'女\',\'1972-05-05\',\'助教\',\'计算机系\')
insert into teacher values(\'831\',\'刘冰\',\'女\',\'1977-08-14\',\'助教\',\'电子工程系\')
select *from teacher