插入多行有条件

Question

I need to insert multiple rows for current column in a table.

sql

insert into pa
(cd)
values
((select 'SU' from pa where pa_id = 101))
 ;

What is the correct syntax? Getting error, cannot insert null value.

Answer 1

insert into pa (cd)
select 'SU' 
from pa
where pa_id = 101

Answer 2

I suspect that you want an update instead:

update pa
    set cd = 'SU'
    where pa_id = 101;

insert inserts a new row. All the columns not included in the insert are set to NULL -- which is no doubt causing your error.

You seem to want to change the value in an existing row; update does that.