CREATE TABLE birthday (B_MONTH NUMBER, B_DAY NUMBER, B_RANK NUMBER); / INSERT IN
ID: 3835776 • Letter: C
Question
CREATE TABLE birthday
(B_MONTH NUMBER,
B_DAY NUMBER,
B_RANK NUMBER);
/
INSERT INTO birthday
SELECT * FROM hchen.birthday;
/
COMMIT;
/
SELECT COUNT(*) FROM birthday;
/
Write a PL/SQL anonymous block that accepts an integer n (n = 1 or n = 2) from the user input and 1) displays the most popular birthdays along with the ranks for each month if the user input is 1 (n = 1), or 2) displays the least popular birthdays along with the ranks for each month if the user input is 2 (n = 2). Sort your output in ascending order by months.
You will lose 10 points if the title lines are missing in your output.
You will lose 10 points if your output is not in the correct format. For example, you must display the birthdays and ranks for the same month in one line.
Each day-rank pair must be displayed in the DD/RRR format (2-digit day and 3-digit rank) (e.g., 08/012).
You may hard-corded values of months (e.g., FOR idx IN 1..12 LOOP).
If you have hard coded the birthdays or ranks (e.g., DBMS_OUPT.PUT_LINE('1 20/ 240')) in your PL/SQL block, you will receive 0 points.
To avoid complicating issues, you can assume that the user always enters input from keyboard that consists only of the digits 0 through 9 and Enter.
This question can be solved without using cursors.
Submitting more than one PL/SQL program will receive 0 points.
Explanation / Answer
declare n Number:=&nn;
Begin
if(n=1) Then
For X in(select LPAD(B_DAY,2,'0') AS 'd_day', LPAD(B_RANK,3,'0') AS 'D_RANK' FROM birthday group by concat(B_DAY,"-",B_MONTH) ASC fetch first 5 rows only)
LOOP
DBMS_OUTPUT.PUT_LINE(X.D_DAY ll '/' llx.D_RANK);
END LOOP;
ELSIF(n=2) THEN
FOR X IN(SELECT LPAD(B_DAY,2,'0'),LPAD(B_RANK,3,'0');
FROM BIRTHDAY GROUP BY concat(B_DAY,"-",B_MONTH)ORDER BY COUNT(B_DAY) ASC B_MONTH ASC,CONCAT(B_DAY,"-",B_MONTH ASC FETCH FIRST 5 ROWS ONLY),
LOOP
DBMS_OUTPUT.PUT_LINE(X.D_DAY ll '/' ll X.D_RANK);
END LOOP;
ELSE
DBMS_OUTPUT.PUT_LINE('PLEASE ENTER EITHER 1 OR 2');
END IF;
END;
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