SQL SUM if field is a specific value - mysql

Question

I have an SQL Query that used to have inclusive <> '1' as a clause but I had to remove it to ensure I pick up all the data but I still need to count the value of the inclusive field in the SUM
Is it possible to make the SUM(customer_cost) as customer_total not include rows where inclusive <> '1'
$callChargesSql = "SELECT
customer,
source,
source_name,
calltype,
SUM(customer_cost) as customer_total,
SUM(cost) as cost,
SUM(recording_cost) as recording_cost,
SUM(recording_customer) as recording_customer
FROM
billing_calldata
WHERE
(
customer = '".db_string($result["sequence"])."' OR
customer IN
(
SELECT
sequence
FROM
customer
WHERE
resellerid = '".db_string($result["sequence"])."'
)
) AND
(
(
MONTH(timestamp) = '".db_string($calls["month"])."' AND
YEAR(timestamp) = '".db_string($calls["year"])."'
) OR
status = 'y'
)
GROUP BY customer, source, calltype
ORDER BY customer, timestamp ASC;";

Answer 1

In MySQL you can use IF statement within SUM operator like:
SUM(IF(inclusive = '1',customer_cost, 0)) as customer_total
Below simplified example:
select
customer_id,
sum(customer_cost) as total_customer_cost,
sum(if(inclusive=1, customer_cost, 0)) as inclusive_customer_cost
from billing_calldata
group by customer_id
;
Here you can test it: SQLize.online
In my test you can

Answer 2

You can use something like this: SUM(case when inclusive = '1' then customer_cost else 0 end) as customer_total
In your example query:
$callChargesSql = "SELECT
customer,
source,
source_name,
calltype,
SUM(case when inclusive = '1' then customer_cost else 0 end) as customer_total,
SUM(cost) as cost,
SUM(recording_cost) as recording_cost,
SUM(recording_customer) as recording_customer
FROM
billing_calldata
WHERE
(
customer = '".db_string($result["sequence"])."' OR
customer IN
(
SELECT
sequence
FROM
customer
WHERE
resellerid = '".db_string($result["sequence"])."'
)
) AND
(
(
MONTH(timestamp) = '".db_string($calls["month"])."' AND
YEAR(timestamp) = '".db_string($calls["year"])."'
) OR
status = 'y'
)
GROUP BY customer, source, calltype
ORDER BY customer, timestamp ASC;";