76 lines
2.1 KiB
Markdown
76 lines
2.1 KiB
Markdown
# P4 - PL/SQL block
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**Problem Statement:** Write a PL/SQL block for following requirements and handle the exceptions. Roll no. of students will be entered by the user. Attendance of roll no. entered by user will be checked in the Stud table. If attendance is less than 75% then display the message “Term not granted” and set the status in stud table as “Detained”. Otherwise display message “Term granted” and set the status in stud table as “Not Detained”. Student (Roll, Name, Attendance, Status)
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---
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## Creating table
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```sql
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CREATE TABLE Student(
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Roll NUMBER(14),
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Name VARCHAR(255),
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Attendance NUMBER(14),
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Status VARCHAR(255)
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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 Student VALUES (1, 'Tanmay', 76, NULL);
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INSERT INTO Student VALUES (2, 'Rajesh', 80, NULL);
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INSERT INTO Student VALUES (3, 'Tejas', 88, NULL);
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INSERT INTO Student VALUES (4, 'Machkar', 35, NULL);
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INSERT INTO Student VALUES (5, 'Jayashree', 74, NULL);
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```
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## Procedure
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```sql
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DECLARE
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p_att Student.Attendance%type;
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p_roll Student.Roll%type;
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nodata EXCEPTION;
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BEGIN
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DBMS_OUTPUT.PUT_LINE('Enter roll number: ');
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p_roll := &p_roll;
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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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SELECT Attendance INTO p_att FROM Student WHERE Roll = p_roll;
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IF (p_att < 75) THEN
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DBMS_OUTPUT.PUT_LINE('Term not granted to roll no. ' || p_roll);
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UPDATE Student SET Status = 'Detained' WHERE Roll = p_roll;
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ELSIF (p_att >= 75) THEN
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DBMS_OUTPUT.PUT_LINE('Term granted to roll no. ' || p_roll);
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UPDATE Student SET Status = 'Not Detained' WHERE Roll = p_roll;
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END IF;
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EXCEPTION
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WHEN nodata THEN
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DBMS_OUTPUT.PUT_LINE('Please enter a valid roll number.');
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WHEN OTHERS THEN
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DBMS_OUTPUT.PUT_LINE('Error occured. Error: ' SQLERRM);
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END;
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/
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```
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<details>
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<summary>Output</summary>
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After entering every Roll no:
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ROLL NAME ATTENDANCE STATUS<br>
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1 Tanmay 76 Not Detained<br>
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2 Rajesh 80 Not Detained<br>
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3 Tejas 88 Not Detained<br>
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4 Machkar 35 Detained<br>
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5 Jayashree 74 Detained<br>
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</details>
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---
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