This content originally appeared on DEV Community and was authored by NatpuEnean VA
Part 1: Cursor – Process Cursor with Condition
Problem Statement
We need to create a cursor that displays employee names whose salary is greater than 50,000 from the Employee table.
Steps
Create the Employee table (if not already available):
CREATE TABLE Employee (
EmpID INT PRIMARY KEY,
EmpName VARCHAR(50),
Salary DECIMAL(10,2)
);
Insert some sample records:
INSERT INTO Employee (EmpID, EmpName, Salary) VALUES
(1, 'Alice', 60000),
(2, 'Bob', 48000),
(3, 'Charlie', 75000),
(4, 'David', 45000),
(5, 'Eve', 90000);
Create and use the Cursor:
DECLARE @EmpName VARCHAR(50), @Salary DECIMAL(10,2);
DECLARE EmployeeCursor CURSOR FOR
SELECT EmpName, Salary
FROM Employee
WHERE Salary > 50000;
OPEN EmployeeCursor;
FETCH NEXT FROM EmployeeCursor INTO @EmpName, @Salary;
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'Employee: ' + @EmpName + ' | Salary: ' + CAST(@Salary AS VARCHAR);
FETCH NEXT FROM EmployeeCursor INTO @EmpName, @Salary;
END;
CLOSE EmployeeCursor;
DEALLOCATE EmployeeCursor;
Output Example
Only employees with salaries greater than 50,000 will be displayed:
Employee: Alice | Salary: 60000
Employee: Charlie | Salary: 75000
Employee: Eve | Salary: 90000
📌 Part 2: Trigger – AFTER INSERT Trigger on Student Table
Problem Statement
Whenever a new student is added to the Students table, we want to automatically insert a log entry into the Student_Audit table.
Steps
Create Students table:
CREATE TABLE Students (
StudentID INT PRIMARY KEY,
StudentName VARCHAR(50),
Department VARCHAR(50)
);
Create Student_Audit table:
CREATE TABLE Student_Audit (
AuditID INT IDENTITY(1,1) PRIMARY KEY,
StudentID INT,
Action VARCHAR(50),
ActionDate DATETIME
);
Create the Trigger:
CREATE TRIGGER trg_AfterStudentInsert
ON Students
AFTER INSERT
AS
BEGIN
INSERT INTO Student_Audit (StudentID, Action, ActionDate)
SELECT StudentID, 'INSERT', GETDATE()
FROM inserted;
END;
Test the Trigger by inserting a new student:
INSERT INTO Students (StudentID, StudentName, Department)
VALUES (101, 'Rahul', 'Computer Science');
Check the Audit table:
SELECT * FROM Student_Audit;
Output Example
AuditID | StudentID | Action | ActionDate
1 | 101 | INSERT | 2025-10-02 10:15:32
This content originally appeared on DEV Community and was authored by NatpuEnean VA
NatpuEnean VA | Sciencx (2025-10-02T05:35:58+00:00) Cursor & Trigger with Examples. Retrieved from https://www.scien.cx/2025/10/02/cursor-trigger-with-examples/
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