Update Data - (SQL Server Database)

In SQL Server, the UPDATE statement is used to modify existing records in a table. The UPDATE statement is a powerful tool for modifying data, but it should be used with caution to avoid unintended modifications.

Syntax

The basic syntax of the UPDATE statement is as follows:

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

The UPDATE statement updates values in columns specified in the SET clause. The WHERE clause is used to filter the rows that are to be updated.

Example

Suppose we have a table called employees that contains information about employees of a company. We want to update the salary of all employees whose job title is "Manager" to 100,000. The SQL statement for this would be as follows:

UPDATE employees
SET salary = 100000
WHERE job_title = 'Manager';

Output

The UPDATE statement modifies the values of the specified columns in the affected rows. In the above example, the salaries of all employees whose job title is "Manager" will be set to 100,000.

Explanation

The UPDATE statement is used to modify existing records in a table. The SET clause is used to specify the new values of the columns that are to be updated. The WHERE clause is used to filter the rows that are to be updated.

Use

The UPDATE statement is commonly used to modify data in SQL Server databases. It is useful for making changes to existing records, such as updating employee information or changing product prices.

Important Points

• The UPDATE statement is used to modify existing records in a table.
• The SET clause is used to specify the new values of the columns that are to be updated.
• The WHERE clause is used to filter the rows that are to be updated.
• It is important to use the WHERE clause carefully to avoid unintended modifications to data.

Summary

In this page, we discussed how to use the UPDATE statement to modify data in SQL Server databases. We covered the syntax, example, output, explanation, use, and important points of the UPDATE statement. By using theWHERE` clause carefully, you can update specific records in your database and avoid unintended modifications to your data.