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Delete statement in SQL Server

The DELETE statement in SQL Server is used to remove one or more records from a table. It allows you to delete specific rows based on specified conditions.

The basic syntax for the DELETE statement is as follows: 


DELETE FROM table_name
WHERE condition;

Let's say we have a table called "Employees" with columns "EmployeeID," "FirstName," and "LastName." Here's an example of how to use the DELETE statement to remove an employee from the table: 


DELETE FROM Employees
WHERE EmployeeID = 1;

In this example, we are deleting the employee with an "EmployeeID" of 1 from the "Employees" table.

You can delete multiple rows in a single DELETE statement by using a more complex condition or by specifying multiple conditions using logical operators: 


DELETE FROM Employees
WHERE LastName = 'Smith' OR EmployeeID = 2;

In this case, we are deleting all employees with a last name of 'Smith' or an "EmployeeID" of 2 from the "Employees" table.

If you want to delete all records in a table, you can omit the WHERE clause. However, be cautious as this will delete all rows in the table: 


DELETE FROM Employees;

This example deletes all records from the "Employees" table.

The WHERE clause is crucial in determining which records should be deleted. It allows you to specify conditions that must be met for the delete operation to be applied to specific rows.

It's important to use the DELETE statement carefully, as it permanently removes data from the table. Always double-check the conditions before executing a DELETE statement to ensure that you're deleting the intended rows.

The DELETE statement is a powerful tool for removing records from SQL Server tables, allowing you to selectively delete rows based on specific conditions.

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