标签:name tb1 mysql8.0 db1 临时文件 where id select
临时文件
create table score( sid int auto_increment primary key, student_id int, course_id int, number int, constraint fk_score_student foreign key(student_id) references student(sid), constraint fk_score_course foreign key(course_id) references course(cid) )engine=innodb default charset=utf8; create table test1( id int auto_increment primary key, name char(10) )engine=innodb default charset=utf8; 增 insert into student(name, age) values('tom', 20); insert into student(name, age) values('tom', 18),('joker', 18); insert into student(name, age) select name, age from info; 删 delete from db1; delete from db1 where 条件判断 delete from db1 where 条件判断 and 条件判断 delete from db1 where 条件判断 or 条件判断 条件判断 = != < <= > >= truncate table db1; 改 update db1 set name = 'master'; update db1 set name = 'joker' where age = 20; 查 前面 select * from db1; select name,age from db1; select name as n, age from db1; 别名 select name,1 from db1; 条件 select * from tb1 where name = 'tom'; # 条件判断 select * from tb1 where name = 'tom' and age >1; select * from tb1 where name = 'tom' or name = 'joker'; select * from tb1 where name in ('tom', 'joker') select * from tb1 where name not in ('tom', 'joker'); select * from tb1 where id between 1 and 5; # 闭区间 select * from tb1 where id in(select id from info); 通配符 select * from tb1 where name like 'a%'; select * from tb1 where name like 'a_'; 注意:% 匹配任意字符,_ 匹配一个字符 分页 select * from tb1 limit 位置, 长度; # 若limit后面,只有一个参数,则是长度 select * from tb1 limit 长度 offset 位置; 排序 select * from tb1 order by id ase; select * from tb1 order by id desc;
标签:name,tb1,mysql8.0,db1,临时文件,where,id,select 来源: https://www.cnblogs.com/wt7018/p/11091440.html
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