1.sql语句不区分大小写
2.每条语句必须以;结尾,字符串用'单引号
3.DDL:Data Definition Language(create table or drop table)
4.DML:Data manipulation Language(insert update delete)
5.DQL:Data Query Language(select)
6.integer:整型值,real:浮点值,text:字符串,blob:二进制数据
7.语句:
create table if not exists t_mydatabase (字段名 字段类型,。。。);
create table t_mydatabase(id integer not null unique, age integer not null default 1,bo integer primary key autoincrement);
drop table if exists t_mydatabase;
insert into t_mydatabase (字段名,字段名) values('yin','ting','ting');
update t_student set school = 'zhongxue', no = 13;
delete from t_mydatabase where 字段 = 字段值 and(or) 字段 = 字段值;
select * from t_mydatabase where age > 10;
select 字段 别名,字段 as 别名,。。。from t_mydatabase 别名;
select 别名.字段 from t_mydatabase as 别名;
select count(字段)from t_mydatabase
select * from t_mydatabase order by score asc, height desc;
select * from t_mydatabase limit 2,10 跳过前面两个,取10条数据
limit 7 表示取前面7条数据