MY SQL Sub query returns more than 1 row

Question

MY SQL--->

insert into table b (col list)
select id,
       Col2 = ( select col from table B where col5 = 'true'),
       Col3 = ( select col from table B where col4 = 'true')
from table a

in this i am getting error

Err] 1242 - Sub query returns more than 1 row

is there any another method to do the same functionality?

Answer 1

You inner queries are returning more than 1 values. This will work since I have limited the inner query result to 1 but I am not sure whether your requirements are satisfied or not.

 insert into table b (col list)
  select id,
   Col2 = ( select col from (select col from table B where col5 = 'true' limit 0,1) as alias  ),
   Col3 = ( select col from (select col from table B where col4 = 'true'  limit 0,1) as alias 2)
 from table a