Solution: Overcoming Limited Capabilities

SMQS.COM

DBC.COM

Wrapper 1

Wrapper 2

Mediator

Select Q.last, Q’.volume

from Quotes1 Q, Quotes3 Q´

where Q.ticker = Q´.ticker and

Q.company = “Oracle”

Select last

from Quotes1

where ticker = $T

Select volume, ticker

from Quotes2

where company = “Oracle”

ticker $T