MySQL: show a row that not contains a specific value - mysql

Question

I can't show in MySQL a specific row that not contains a value.
First of all this is my two tables:
And this is an array with the info of both tables:
Bills table:
[0] => Array
(
[id] => 1
[reference] => #001001
[seat_id] => 101
[client_id] => 10200
)
[1] => Array
(
[id] => 2
[reference] => #001002
[seat_id] => 102
[client_id] => 10400
)
[2] => Array
(
[id] => 3
[reference] => #001003
[seat_id] => 103
[client_id] => 10600
)
Accounting_seats table:
[0] => Array
(
[0] => Array
(
[id] => 1
[seat_id] => 101
[account_id] => taxes_qty
[value] => 0.99
[client_id] => 10200
)
[1] => Array
(
[id] => 2
[seat_id] => 101
[account_id] => tax_base
[value] => 4
[client_id] => 10200
)
[2] => Array
(
[id] => 3
[seat_id] => 101
[account_id] => total
[value] => 4.99
[client_id] => 10200
)
)
[1] => Array
(
[0] => Array
(
[id] => 4
[seat_id] => 102
[account_id] => taxes_qty
[value] => 2.00
[client_id] => 10400
)
[1] => Array
(
[id] => 5
[seat_id] => 102
[account_id] => tax_base
[value] => 8.00
[client_id] => 10400
)
[2] => Array
(
[id] => 6
[seat_id] => 102
[account_id] => shipping_cost
[value] => 2.00
[client_id] => 10400
)
[3] => Array
(
[id] => 7
[seat_id] => 102
[account_id] => total
[value] => 12.00
[client_id] => 10400
)
)
[2] => Array
(
[0] => Array
(
[id] => 8
[seat_id] => 103
[account_id] => taxes_qty
[value] => 3
[client_id] => 10600
)
[1] => Array
(
[id] => 9
[seat_id] => 103
[account_id] => tax_base
[value] => 7
[client_id] => 10600
)
[2] => Array
(
[id] => 10
[seat_id] => 103
[account_id] => shipping_cost
[value] => 3.99
[client_id] => 10600
)
[3] => Array
(
[id] => 11
[seat_id] => 103
[account_id] => total
[value] => 13.99
[client_id] => 10600
)
)
The problem is that I cannot show the bill where the accounting_seats not contain the value "shipping_cost". Only show the 2 bills with shipping_cost or all bills, but I need the bill without shiipping_cost value.
SELECT reference, seat_id FROM bills WHERE seat_id IN(101,102,103) AND seat_id IN (SELECT seat_id FROM accounting_seats WHERE account != 'shipping_cost');
Tons of thanks for any help!

Answer 1

I would reommend not exists:
select reference, seat_id
from bills b
where
b.seat_id in(101,102,103)
and not exists (
select 1
from accounting_seats acs
where acs.account = 'shipping_cost' and acs.seat_id = b.seat_id
)
As compared to not in, not exists usually scales better when the size of the underlying table increases (here, accounting_seats): the above query woulud take advantage of an index on accounting_seats(account, seat_id). Another upside of this approach is that not exists is safe as regard to null values in seat_id, while not in isn't.

Answer 2

Try this:
SELECT reference, seat_id
FROM bills
WHERE seat_id IN(101,102,103)
AND seat_id NOT IN (SELECT seat_id FROM accounting_seats WHERE account = 'shipping_cost');