DATABASE MANAGEMENT SYSTEM - Write a PL/SQL block to display the reverse of numbers between 1 and 10

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PL/SQL 1).Write a PL/SQL block to display the reverse of numbers between 1 and 100. .

SQL> declare 2 i number(3); 3 begin 4 i:=1; 5 for i in reverse 100..1 loop 6 dbms_output.put_line(i); 7 end loop; 8 end; 9 / PL/SQL procedure successfully completed.

Output: 100 99 98 97 96 95 94 93 92 91 90

89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40

39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15

14 13 12 11 10 9 8 7 6 5 4 3 2 1

2) Write a PL/SQL block to find the greatest of three numbers.

SQL> set serveroutput on SQL> declare 2 a number(3); 3 b number(3); 4 c number(3); 5 begin 6 a: ='&a'; 7 b: ='&b';

8 c: ='&c'; 9 if a>b then 10 if b>c then 11 dbms_output.put_line ('a value is greater'); 12 end if; 13 elsif b>c then 14 dbms_output.put_line ('b value is greater'); 15 else 16 dbms_output.put_line ('c value is greater'); 17 end if; 18 end; 19 / Output: Enter value for a: 55 Old 6: a:='&a'; New 6: a:='55'; Enter value for b: 99 Old 7: b:='&b'; New 7: b:='99'; Enter value for c: 789 Old 8: c:='&c'; New 8: c:='789'; c value is greater PL/SQL procedure successfully completed.

3) Write a PL/SQL block to generate fibonacci series.

SQL> set serveroutput on SQL> declare 2 a number (2); 3 b number (2); 4 c number (3); 5 d number (2); 6 begin 7 a: =0; 8 b: =1; 9 c: =1; 10 d: ='&d'; 11 while c<d loop 12 dbms_output.put_line (to_char(c)); 13 c: =a+b; 14 a: =b; 15 b: =c; 16 end loop; 17 end; 18 / Output: Enter value for d: 10

Old 10: d: ='&d'; New 10: d: ='10'; 1 1 2 3 5 8 PL/SQL procedure successfully completed.

4). Write a block to raise an exception if the reservation date is less than today's date.

SQL> declare 2 date_too_less exception; 3 reservation_date seat_reservation.sr_date%type; 4 today_date date; 5 begin 6 select sysdate into today_date from dual; 7 select sr_date into reservation_date from seat_reservation where flight_number='101'; 8 if reservation_date <today_date then 9 raise date_too_less; 10 end if; 11 exception

12 when date_too_less then 13 dbms_output.put_line ('Reservation date is less'); 14 when others then 15 null; 16 end; 17 /

5) Write a cursor to give the details of all the flights.

SQL> set serveroutput on SQL> declare 2 cursor flight1 is select flight_number,airline,weekdays from flight; 3 flight_number flight.flight_number%type; 4 airline flight.airline%type; 5 weekdays flight.weekdays%type; 6 begin 7 open flight1; 8 loop 9 fetch flight1 into flight_number,airline,weekdays; 10 if flight1%found then 11 dbms_output.put_line('Flight_number='||flight_number||' Airline='||airline ||' Weekdays='||weekdays); 12 else 13 exit;

14 end if; 15 end loop; 16 end; 17 / Output: Flight_number=SG108 Airline=Spice Jet Weekdays=Wednesday Flight_number=AI127 Airline=Air India Weekdays=Monday Flight_number=6E142 Airline=Jet Airways Weekdays=Wednesday Thursday Flight_number=9W442 Airline=Jet Airways Weekdays=Sunday Tuesday Friday Flight_number=EY171 Airline=Eithad Airways Weekdays=Sunday Monday Flight_number=SG3710 Airline=Air India Weekdays=Monday Wednesday Friday Flight_number=6E302 Airline=Indigo Weekdays=Monday Wednesday Friday Flight_number=E18115 Airline=Go Air Weekdays=Sunday Flight_number=QR5111 Airline=Qatar Weekdays=Wednesday Flight_number=AI852 Airline=Air India Weekdays=Wednesday Friday PL/SQL procedure successfully completed.