How can I do boolean logic on two columns in MySQL?

Question

I want to do a select in MySql that combines several columns... something like this pseudocode:

SELECT payment1_paid AND payment2_paid AS paid_in_full 
FROM          


        

Answer 1

If by combine you mean concatenate then this will work:

select concat(payment1_paid, payment2_paid) as paid_in_full
from denormalized_payments where payment1_type = 'check';

If by combine you mean add, then this should work:

select payment1_paid + payment2_paid as paid_in_full
from denormalized_payments where payment1_type = 'check';

[EDIT]

For boolean AND:

select payment1_paid && payment2_paid as paid_in_full
from denormalized_payments where payment1_type = 'check';