列类型指定int 与number有什么区别
int和number都是数值类型,int是正整数,number可以允许小数位,number重点在这里不多讲,只是说在不指定参数的情况下有什么区别?
还是老风格,用实例说话
SQL> conn zhang/zhang;
Connected.
SQL> create table tt(id int,id1 number);
Table created.
SQL> desc tt;
Name Null? Type
—————————————– ——– —————————-
ID NUMBER(38)
ID1 NUMBER
SQL> alter table tt add id1 number(38);
alter table tt add id1 number(38)
*
ERROR at line 1:
ORA-01430: column being added already exists in table
SQL> alter table tt add id2 number(38);
Table altered.
SQL> desc tt;
Name Null? Type
—————————————– ——– —————————-
ID NUMBER(38)
ID1 NUMBER
ID2 NUMBER(38)
SQL> insert into tt values(1.1,1.1,1.1);
1 row created.
SQL> select * from tt;
ID ID1 ID2
———- ———- ———-
1 1.1 1
SQL>
Wonderful job right here. I really enjoyed what you had to say. Keep heading because you unquestionably bring a new voice to this topic. Not many people would say what youve said and still make it interesting. Properly, at least Im interested. Cant wait to see a lot more of this from you.
What an awesome way to explain thisnow I know everytihng!