Suppose that a Database Administrator creates four accounts $($U$91,$ U$56,$ U$47$ and U$82),$ and allow U$82$ to create base relations under a schema called MyStore.

Account U$82$ creates $4$ base relations under MyStore schema as follows:

MyStore DB Schemas

ITEMS$($item$\_$id$,$ Name, Price$)$

ORDERS$\_$ITEMS$($order$\_$id$,$ item$\_$id$)$

ORDERS$($order$\_$id$,$ order$\_$date, customer$\_$id$)$

CUSTOMERS$($customer$\_$id$,$ customer$\_$name, customer$\_$email$)$