整形

– 1. 创建数据表
create table my_int(
int_1 tinyint,
int_2 smallint,
int_3 mediumint,
int_4 int,
int_5 bigint
)charset utf8;

– 2. 插入数据
insert into my_int values (10,1000,100000,1000000,100000000);

– 3.插入错误数据
insert into my_int values (255,255,255,255,255);
insert into my_int values (127,255,255,255,255);

– 4.无符号标识设定并插入数据
alter table my_int add int_6 tinyint unsigned first;
insert into my_int values (255,100,255,255,255,255);

– 从左侧开始填充0
alter table my_int add int_7 tinyint zerofill first;
insert into my_int values (1,100,100,255,255,255,255);

– 指定显示长度
alter table my_int add int_8 tinyint(2) zerofill first;
insert into my_int values (1,1,100,100,255,255,255,255);