database - mysql calculation several column -


i have current db following queries:

table name : service fields: service_id,name,labor_hour,part_cost,rate_id

`service_id` `primary key`   rate_id foreign key references rate(rate_id)

rate(rate_id,labor_cost_per_hour) primary key(rate_id)

table name: order_service fields :

order_service_id,order_id,service_id     order_service_id primary key     order_id foreign key references order(order_id)     service_id foreign key references service(service_id)  service cost = labor hours * labor cost per hour + part cost

i want list service id , cost of services costs more number. not sure how calculation service cost in mysql; thought inner join 2 tables, seems not work. give me helps? thanks!

try this

select service_id,(labor hours * labor cost per hour + part cost)  service s inner jion   rate r on r.rate=s.rate   (labor hours * labor cost per hour + part cost) > 500

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