在oracle表中插入空字段和null测试
时间:2021-07-01 10:21:17
帮助过:2人阅读
table testTable
(
id number,
name varchar2(
100)
)
select * from testTable
insert into testTable(id,name)
values(
1,
‘user1‘)
insert into testTable(id,name)
values(
2,
‘‘)
insert into testTable(id,name)
values(
3,
null)
select count(id)
from testTable t
where t.name
=‘‘
select count(id)
from testTable t
where t.name
is null or t.name
!=‘‘
select id,nvl(name,
‘null‘)
from testTable
select id,
nullif(name,
‘1231231‘)
from testTable
drop table testTable
在oracle表中插入空字段和null测试
标签: