How to Insert data one table to another table

Question

sir,
I am creating a website where i am add a login page so where i want when the user is login then that user's user id is auto matick insert where registred user's user id when the user is upload any data in my site.
ex. database:- register_tbl
where column: user_id
user_name
mobile_no
data table2:-  complain_tbl
column name: user_id(copy from register_tbl)
complain type
complain
i want this type of connection to copy or retrieve data from register_tbl to complain_tbl where user_id.
pls help me.
and see the this picture what i want.

Abhay Shanker · Accepted Answer

On Login Screen Store the user_id in sesion and use where ever you want to add your data in whole application

Bharath Reddy · Answer

Insert Into Table2(column1, Column2, Column3)
(
select column1,column2,column3 from Table1 where userId=@UserID
)

Vishal Shukla · Answer

sir can you provide me the code??