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Figuer:
CUSTOMER In table CUSTOMER, CID is the primary key (Customer ID) .
RENTALS In the table RENTALS, RTN provides the rental number (the primary key) , CID is the customer's unique id, PICKUP is the city where the car was picked up, and Return is the city where the car was returned.
RENTCOST RENTCOST shows the base cost of renting a given MAKE for one day.
CITYADJ If the return city of table RENTALS is the one listed in table CITYADJ, the cost of the rental is multiplied by FACTOR and by DAYS shown in table RENTLENGTH below.
RENTLENGTH RENTLENGTH shows the number of days for the rental number (RTN) shown in table RENTALS. In a database used in reality, this table would be merged with the RENTALS table.
-SELECT DISTINCT CNAME FROM CUSTOMER
WHERE CID IN
(SELECT CID FROM RENTALS WHERE RETURN IN
(SELECT BIRTHPLACE FROM CUSTOMER) )
What is the meaning of this query?
Hardiness
A personality trait characterized by resilience and the ability to endure stressful situations.
Continuity
The state or quality of being continuous, consistent, and without interruption in processes, existence, or operations.
Social Support
The perceived comfort, care, esteem, or help one receives from others, which plays a crucial role in psychological well-being and stress management.
Stress-Related Illnesses
Health problems that are directly or indirectly caused by stress, including psychological and physical conditions.
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