First insertion in table is inserting nulls in not null columns

[Anuj]

Hi Everyone,

I have created a table in database. I have made many columns not null
and have not given
any default value. When I am doing insertion for first time, in not
null columns null values are inserted. When I have given not null then
why null is inserted into the table. Please help me to understand this
problem.

Thanks
Anuj