generated always as identity

create table test
(
    id int generated always as identity(start with 1, increment by 1, max 100),         
    name varchar(50)
)

DB2字段类型研究 --- INTEGER或INT(大整型)

说明：大整型是四个字节的整数，精度为 10 位。大整型的范围从 -2,147,483,648 到 2,147,483,647。

增加字段：ALTER TABLE <tableName> ADD COLUMN <columnName> integer

修改字段类型：ALTER TABLE <tableName> ALTER <columnName> SET DATA TYPE integer

删除字段：ALTER TABLE <tableName> DROP <columnName>

验证字段范围：

insert into aaa(col_interger) values(-2147483648) --成功
insert into aaa(col_interger) values(-2147483649) --失败
insert into aaa(col_interger) values(2147483647)  --成功
insert into aaa(col_interger) values(2147483648)  --失败

Column                         Type      Type
name                           schema    name               Length   Scale Nulls
------------------------------ --------- ------------------ -------- ----- ------
<columnName>                   SYSIBM    INTEGER                   4     0 Yes