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);???? #同時增加多條

insert into tb12(name,age) select name,age from tb11;???????? #將tb11表整個插入tb12

刪

delete from tb12;

delete from tb12 where id !=2

delete from tb12 where id =2

delete from 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'????? #條件

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';??? #將name取別名顯示

select name,age,11 from tb12;? #第三列全為11

其他：

select * from tb12 where id != 1

select * from tb12 where id in (1,5,12);? # 1 or 5 or 12

select * from tb12 where id not in (1,5,12);

select * from tb12 where id in (select id from tb11)? #范圍克重另一張表中選擇

select * from tb12 where id between 5 and 12;? #閉區間

通配符：

select * from tb12 where name like "a%" #以a開頭的??????? %a以a結尾的

select * from tb12 where name like "a_" #a后邊只有一個位置

分頁：

select * from tb12 limit 10;??? #分頁顯示

select * from tb12 limit 0,10;

select * from tb12 limit 10,10;

select * from tb12 limit 20,10;?? #起始位置，和顯示數量??? 從20個開始，往后顯示10個

select * from tb12 limit 10 offset 20;

從第20行開始讀取，讀取10行；

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;

取后10條數據??? id從大到小排后取前十個

select * from tb12 order by id desc limit 10;

補充：

左右連表： join

上下連表： union

# 自動去重

select id,name from tb1

union

select num,sname from tb2

# 不去重

select sid,sname from student

UNION ALL

select sid,sname from student

總結

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