How to Use Delete Statement in SQL Server । SQL ডিলিট স্টেটমেন্ট । SQL Server Bangla Training। Ep:1

How to Use Delete Statement in SQL Server। SQL ডিলিট স্টেটমেন্ট । SQL Server Bangla Training। Ep:16

In SQL Server, the DELETE statement is used to remove data from a table based on certain conditions. This statement is an essential tool for managing databases effectively. In this YouTube video, we will learn about the DELETE statement in SQL Server, including how it works, how to use it effectively, and some best practices to follow.

Part 1: Basic Syntax of DELETE Statement

The basic syntax of the DELETE statement in SQL Server is straightforward. Here is an example:

sql
DELETE FROM table_name
WHERE condition;
The DELETE keyword is followed by the FROM keyword, which specifies the name of the table from which data is to be deleted. The WHERE clause is used to specify the condition that must be met in order for the row to be deleted.

For example, if we want to delete all the rows from a table named employees where the age column is greater than 50, we would use the following SQL statement:

sql
DELETE FROM employees
WHERE age 50;
Part 2: Deleting Data from Multiple Tables

Sometimes, we may need to delete data from multiple tables. This can be achieved using the DELETE statement with a JOIN clause. Consider the following two tables:

diff
employees:
+----+-------+------+
| id | name | age |
+----+-------+------+
| 1 | John | 25 |
| 2 | Jane | 30 |
| 3 | Peter | 45 |
+----+-------+------+

departments:
+----+------------+
| id | department |
+----+------------+
| 1 | IT |
| 2 | HR |
| 3 | Sales |
+----+------------+
If we want to delete all the employees who work in the HR department, we would use the following SQL statement:

sql
DELETE employees
FROM employees
JOIN departments ON employees.department_id = departments.id
WHERE departments.department = 'HR';
In this example, we use the JOIN clause to join the employees and departments tables on the department_id and id columns, respectively. We then use the WHERE clause to specify that we want to delete all the employees who work in the HR department.

Part 3: Using Subqueries in DELETE Statement

Subqueries can be used in the WHERE clause of the DELETE statement to specify more complex conditions. For example, consider the following two tables:

diff
employees:
+----+-------+------+
| id | name | age |
+----+-------+------+
| 1 | John | 25 |
| 2 | Jane | 30 |
| 3 | Peter | 45 |
+----+-------+------+

salaries:
+----+---------+
| id | salary |
+----+---------+
| 1 | 50000 |
| 2 | 60000 |
| 3 | 70000 |
+----+---------+
If we want to delete all the employees who earn less than $60,000, we would use the following SQL statement:

sql
DELETE FROM employees
WHERE id IN (
SELECT id FROM salaries WHERE salary 60000
);
In this example, we use a subquery in the WHERE clause to select all the employees whose id appears in the salaries table where the salary is less than $60,000.

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