database - Every derived table must have its own alias error in MySQL -

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i have following query:

select sum( cost )  (  select s.cost sandwiches s s.name =  "cheese steak" ) union (  select p.cost pizza p type =  "plain" , size =  "l" )

that gives me error of:

#1248 - every derived table must have own alias

you need alias temp tables 

select sum( cost )  (   (   select s.cost   sandwiches s   s.name =  "cheese steak"   ) t1 union    (   select p.cost   pizza p   type =  "plain"   , size =  "l"   ) t2 ) t

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