sppu-te-comp-content/DatabaseManagementSystems
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Improved queries for A4.

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- Changed column names for better understanding
- Changed dates in inserted data to show all fine cases
- Added comments in procdure and changed variable names
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K 2024-11-02 01:14:37 +05:30
parent ebe898535f
commit 25e849ccd0
Signed by: notkshitij
GPG Key ID: C5B8BC7530F8F43F
1 changed files with 44 additions and 52 deletions
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Practical/Assignment-A4+A5/Queries-A4.md Executable file → Normal file
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@ -4,19 +4,19 @@
```sql ```sql
CREATE TABLE Borrower ( CREATE TABLE Borrower (
Roll_no NUMBER(15), roll_no INT,
Name VARCHAR(255), issuer_name VARCHAR(255),
DateOfIssue DATE, issue_date DATE,
NameOfBook VARCHAR(255), book_name VARCHAR(255),
Status VARCHAR(255), status VARCHAR(1),
PRIMARY KEY(Roll_no) PRIMARY KEY (roll_no)
); );
CREATE TABLE Fine ( CREATE TABLE Fine (
Roll_no NUMBER(15), roll_no INT,
DateOfReturn DATE, return_date DATE,
Amount NUMBER(15), amt INT,
FOREIGN KEY(Roll_no) REFERENCES Borrower(Roll_no) FOREIGN KEY (roll_no) REFERENCES Borrower (roll_no)
); );
``` ```
@ -24,71 +24,63 @@ CREATE TABLE Fine (
## Inserting data ## Inserting data
```sql ```sql
INSERT INTO Borrower (Roll_no, Name, DateOfIssue, NameOfBook, Status) values (1, 'Ayush Kalaskar', TO_DATE('2024-07-28','YYYY-MM-DD'), 'DBMS', 'I'); INSERT INTO Borrower VALUES (1, 'Kalas', TO_DATE('2024-10-19', 'YYYY-MM-DD'), 'DBMS', 'I');
INSERT INTO Borrower VALUES (2, 'Himanshu', TO_DATE('2024-10-01', 'YYYY-MM-DD'), 'TOC', 'I');
INSERT INTO Borrower (Roll_no, Name, DateOfIssue, NameOfBook, Status) values (2, 'Himanshu Patil', TO_DATE('2024-07-01','YYYY-MM-DD'),'IOT', 'I'); INSERT INTO Borrower VALUES (3, 'MEPA', TO_DATE('2024-10-25', 'YYYY-MM-DD'), 'IoT', 'I');
INSERT INTO Borrower VALUES (4, 'Kshitij', TO_DATE('2024-10-29', 'YYYY-MM-DD'), '1984', 'I');
INSERT INTO Borrower (Roll_no, Name, DateOfIssue, NameOfBook, Status) values (3, 'Kshitij', TO_DATE('2024-08-05','YYYY-MM-DD'), 'TOC', 'I');
``` ```
## Procedure ## Procedure
```sql ```sql
DECLARE DECLARE
p_nameofbook VARCHAR(255); p_roll NUMBER; -- specify roll number here since Live SQL cannot take input from user
p_rollno NUMBER(15) := 1; -- Eg. p_roll NUMBER := 1 will take roll number 1 as input
p_dateofissue DATE; p_book VARCHAR2(255); -- specify book name here since Live SQL cannot take input from user
currentdate DATE; -- Eg. p_book VARCHAR2(255) := 'DBMS'
noofdays NUMBER(15); p_issueDate DATE;
amount NUMBER(15); totalDays NUMBER;
currentDate DATE;
fineAmt NUMBER;
nodata EXCEPTION; nodata EXCEPTION;
BEGIN BEGIN
p_nameofbook := '&p_nameofbook'; -- Check if roll number is valid
currentdate := SYSDATE; IF (p_roll <= 0) THEN
IF p_rollno <= 0 THEN
RAISE nodata; RAISE nodata;
END IF; END IF;
SELECT DateOfIssue -- Storing values from table in variables
INTO p_dateofissue SELECT issue_date INTO p_issueDate FROM Borrower WHERE roll_no = p_roll AND book_name = p_book;
FROM Borrower
WHERE Roll_no = p_rollno AND NameOfBook = p_nameofbook;
SELECT TRUNC(SYSDATE) - p_dateofissue -- Getting the total days since book issue
INTO noofdays SELECT TRUNC(SYSDATE) - p_issueDate INTO totalDays FROM dual;
FROM dual;
DBMS_OUTPUT.PUT_LINE('No of days: ' || noofdays); -- Calculating fine
IF (noofdays > 30) THEN IF (totalDays > 30) THEN
amount := noofdays * 50; fineAmt := totalDays * 50; -- Rs. 50 per day for total days greater than 30
ELSIF (noofdays >= 15 AND noofdays <= 30) THEN ELSIF (totalDays BETWEEN 15 AND 30) THEN
amount := noofdays * 5; fineAmt := totalDays * 5; -- Rs. 5 per day for total days between 15 and 30
ELSE ELSE
amount := 0; fineAmt := 0;
END IF; END IF;
IF amount > 0 THEN -- Inserting data into Fine table
INSERT INTO Fine (Roll_no, DateOfReturn, Amount) IF fineAmt > 0 THEN
VALUES (p_rollno, SYSDATE, amount); DBMS_OUTPUT.PUT_LINE('Roll no. ' || p_roll || ' has been fined Rs. ' || fineAmt || ' for being ' || totalDays || ' days late.');
END IF; INSERT INTO Fine VALUES (p_roll, SYSDATE, fineAmt);
ELSE
IF amount > 0 THEN DBMS_OUTPUT.PUT_LINE('Roll no. ' || p_roll || ' does not have to pay any fine.');
UPDATE Borrower
SET Status = 'R'
WHERE Roll_no = p_rollno;
END IF; END IF;
UPDATE Borrower SET status = 'R' WHERE roll_no = p_roll AND book_name = p_book;
EXCEPTION EXCEPTION
WHEN nodata THEN WHEN nodata THEN
DBMS_OUTPUT.PUT_LINE('Roll number or book name not found.'); DBMS_OUTPUT.PUT_LINE('Roll number' || p_roll || ' not found.');
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE('No entry found for the provided roll number and book name.');
WHEN OTHERS THEN WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE('An error occurred: ' || SQLERRM); DBMS_OUTPUT.PUT_LINE('An error occured. Error: ' || SQLERRM);
END; END;
/ /
``` ```