4)Consider the following Entities and Relationships [30 Marks]
Room (roomno, desc, rate)
Guest (gno, gname, no_of_days)
Relation between Room and Guest is One to One.
Constraint: Primary key, no of days should be > 0.
Create a Database in 3NF & write queries for following.
• Display room details according to its rates in ascending order.
• Find the names of guest who has allocated room for more than 3 days
• Find no. of AC rooms.
• Display total amount for NON-AC rooms.
• Find names of guest with maximum room charges.
-->Display room details according to its rates in ascending order.
sql>select desc,rate from room orderd by desc asc;
Find the names of guest who has allocated room for more than 3 days.
sql>select gname from guest,room where guest.gno=room.rno where no_of_days>3;
Find no. of AC rooms.
sql>select count(rno)from room where desc='AC';
Display total amount for NON-AC rooms.
sql>select sum(rate) from room where desc='non=AC';
Find names of guest with maximum room charges.
SQL> selct ganme from room.guest where guest.gno=room.rno and rate=(select max(rate) from room);
/
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