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

问题

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 denormalized_payments 
WHERE payment1_type = 'check';

Edit: payment1_paid and payment2_paid are booleans.

I can't use any other language for this particular problem than MySql.

Thanks for any help!

Edit: Sorry to everybody who gave me suggestions for summing and concatenating, but I've voted those early answers up because they're useful anyway. And thanks to everybody for your incredibly quick answers!

回答1:

Ok, for logical and you can do

Select (payment1_paid && payment2_paid) as paid_in_full 
from denormalized_payments 
where payment1_type = 'check';

As seen here.

回答2:

Just do

Select CONCAT(payment1_paid, payment2_paid) as paid_in_full 
from denormalized_payments 
where payment1_type = 'check';

You can concat any number of field you want.

回答3:

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';

回答4:

I am not sure but do you mean to concatenate?

SELECT CONCAT(ColumnA, ColumnB) AS ColumnZ
FROM Table

回答5:

SELECT IF(payment1_paid = 1 AND payment2_paid = 1, 1, 0) AS paid_in_fill

回答6:

If are Strings (or you want to treat like Strings the columns that you want to combine) you can use CONCAT and CONCAT_WS. Good luck!

回答7:

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

来源：https://stackoverflow.com/questions/248683/how-can-i-do-boolean-logic-on-two-columns-in-mysql

标签

sql

mysql

select

boolean