Kshitij
25e849ccd0
- Changed column names for better understanding - Changed dates in inserted data to show all fine cases - Added comments in procdure and changed variable names
87 lines
2.4 KiB
Markdown
87 lines
2.4 KiB
Markdown
# Database Queries for Assignment-A4
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## Creating tables
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```sql
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CREATE TABLE Borrower (
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roll_no INT,
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issuer_name VARCHAR(255),
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issue_date DATE,
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book_name VARCHAR(255),
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status VARCHAR(1),
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PRIMARY KEY (roll_no)
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);
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CREATE TABLE Fine (
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roll_no INT,
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return_date DATE,
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amt INT,
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FOREIGN KEY (roll_no) REFERENCES Borrower (roll_no)
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);
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```
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## Inserting data
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```sql
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INSERT INTO Borrower VALUES (1, 'Kalas', TO_DATE('2024-10-19', 'YYYY-MM-DD'), 'DBMS', 'I');
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INSERT INTO Borrower VALUES (2, 'Himanshu', TO_DATE('2024-10-01', 'YYYY-MM-DD'), 'TOC', 'I');
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INSERT INTO Borrower VALUES (3, 'MEPA', TO_DATE('2024-10-25', 'YYYY-MM-DD'), 'IoT', 'I');
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INSERT INTO Borrower VALUES (4, 'Kshitij', TO_DATE('2024-10-29', 'YYYY-MM-DD'), '1984', 'I');
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```
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## Procedure
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```sql
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DECLARE
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p_roll NUMBER; -- specify roll number here since Live SQL cannot take input from user
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-- Eg. p_roll NUMBER := 1 will take roll number 1 as input
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p_book VARCHAR2(255); -- specify book name here since Live SQL cannot take input from user
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-- Eg. p_book VARCHAR2(255) := 'DBMS'
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p_issueDate DATE;
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totalDays NUMBER;
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currentDate DATE;
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fineAmt NUMBER;
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nodata EXCEPTION;
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BEGIN
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-- Check if roll number is valid
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IF (p_roll <= 0) THEN
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RAISE nodata;
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END IF;
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-- Storing values from table in variables
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SELECT issue_date INTO p_issueDate FROM Borrower WHERE roll_no = p_roll AND book_name = p_book;
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-- Getting the total days since book issue
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SELECT TRUNC(SYSDATE) - p_issueDate INTO totalDays FROM dual;
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-- Calculating fine
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IF (totalDays > 30) THEN
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fineAmt := totalDays * 50; -- Rs. 50 per day for total days greater than 30
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ELSIF (totalDays BETWEEN 15 AND 30) THEN
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fineAmt := totalDays * 5; -- Rs. 5 per day for total days between 15 and 30
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ELSE
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fineAmt := 0;
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END IF;
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-- Inserting data into Fine table
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IF fineAmt > 0 THEN
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DBMS_OUTPUT.PUT_LINE('Roll no. ' || p_roll || ' has been fined Rs. ' || fineAmt || ' for being ' || totalDays || ' days late.');
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INSERT INTO Fine VALUES (p_roll, SYSDATE, fineAmt);
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ELSE
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DBMS_OUTPUT.PUT_LINE('Roll no. ' || p_roll || ' does not have to pay any fine.');
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END IF;
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UPDATE Borrower SET status = 'R' WHERE roll_no = p_roll AND book_name = p_book;
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EXCEPTION
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WHEN nodata THEN
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DBMS_OUTPUT.PUT_LINE('Roll number' || p_roll || ' not found.');
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WHEN OTHERS THEN
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DBMS_OUTPUT.PUT_LINE('An error occured. Error: ' || SQLERRM);
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END;
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/
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```
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