Question

i dont understand the problem with returning multiple rows:

here is my table BBC:

name    region  area    population  gdp
Afghanistan South Asia  652225  26000000    
Albania Europe  28728   3200000 6656000000
Algeria Middle East 2400000 32900000    75012000000
Andorra Europe  468 64000   
Angola  Africa  1250000 14500000    14935000000
etc.............................

question:

List the name and region of countries
in the regions containing ‘India’,
‘Iran’.

this is my statement:

select name from bbc where region = (select region from bbc where name='India' or name='Iran')

it returns:

sql: errorSubquery returns more than 1 row

whats wrong with my statement? the answer should be in the form of a select statement within a select statement

thank you!

Answer 1

This is because you are trying to compare region to a table of values. Instead, try using in:

select name 
from bbc 
where region in 
    (select region from bbc where name='India' or name='Iran')