MySQL-6-語句數據行操作
阿新 • • 發佈:2018-05-20
int log delet between 排序 max sid AR 通配
語句數據行操作
今日內容
SQL語句數據行操作補充 create table tb12( id int auto_increment primary key, name varchar(32), age int )engine=innodb default charset=utf8; 增 insert into tb11(name,age) values(‘alex‘,12); insert into tb11(name,age) values(‘alex‘,12),(‘root‘,18); insert into tb12(name,age) select name,age from tb11; 刪 delete from tb12; delete from tb12 where id !=2 delete from tb12 where id =2 deletefrom tb12 where id > 2 delete from tb12 where id >=2 delete from tb12 where id >=2 or name=‘alex‘ 改 update tb12 set name=‘alex‘ where id>12 and name=‘xx‘ update tb12 set name=‘alex‘,age=19 where id>12 and name=‘xx‘ 查 select * from tb12; select id,name from tb12; select id,name from tb12 where id > 10 or name =‘xxx‘; select id,name as cname from tb12 where id > 10 or name =‘xxx‘; select name,age,11 from tb12; 其他: select * from tb12 where id != 1 select * from tb12 where id in (1,5,12); select * from tb12 where id not in (1,5,12); select * from tb12 where id in (select id from tb11) select * from tb12 where id between 5 and 12; 通配符: select * from tb12 where name like "a%" select * from tb12 where name like "a_" 分頁: select * from tb12 limit 10; select * from tb12 limit 0,10; select * from tb12 limit 10,10; select * from tb12 limit 20,10; select * from tb12 limit 10 offset 20; # page = input(‘請輸入要查看的頁碼‘) # page = int(page) # (page-1) * 10 # select * from tb12 limit 0,10; 1 # select * from tb12 limit 10,10;2 排序: select * from tb12 order by id desc; 大到小 select * from tb12 order by id asc; 小到大 select * from tb12 order by age desc,id desc; 取後10條數據 select * from tb12 order by id desc limit 10; 分組: select count(id),max(id),part_id from userinfo5 group by part_id; count max min sum avg **** 如果對於聚合函數結果進行二次篩選時?必須使用having **** select count(id),part_id from userinfo5 group by part_id having count(id) > 1; select count(id),part_id from userinfo5 where id > 0 group by part_id having count(id) > 1; 連表操作: select * from userinfo5,department5 select * from userinfo5,department5 where userinfo5.part_id = department5.id select * from userinfo5 left join department5 on userinfo5.part_id = department5.id select * from department5 left join userinfo5 on userinfo5.part_id = department5.id # userinfo5左邊全部顯示 # select * from userinfo5 right join department5 on userinfo5.part_id = department5.id # department5右邊全部顯示 select * from userinfo5 innder join department5 on userinfo5.part_id = department5.id 將出現null時一行隱藏 select * from department5 left join userinfo5 on userinfo5.part_id = department5.id left join userinfo6 on userinfo5.part_id = department5.id select score.sid, student.sid from score left join student on score.student_id = student.sid left join course on score.course_id = course.cid left join class on student.class_id = class.cid left join teacher on course.teacher_id=teacher.tid select count(id) from userinfo5;
先生成兩張表tb11\tb12
create table tb12( id int auto_increment primary key, name varchar(32), age int )engine=innodb default charset=utf8;
as別名不影響數據,只影響表頭
增
增1行
insert into tb11(name,age) values(‘alex‘,12);
增多行
insert into tb11(name,age) values(‘alex‘,12);
將一個表的所有數據,復制到另一張表中
insert into tb12(name,age) select name,age from tb11;
刪
改
查
其他
通配符:
分頁:
排序
分組
作業練習:
http://www.cnblogs.com/wupeiqi/articles/5729934.html
10-15個完成
MySQL-6-語句數據行操作