Which SQL keyword is used to retrieve a maximum value?

 In the context of SQL, the keyword used to retrieve all the maximum values from a particular Column in a database table is MAX(). Here is an example of how you can use it in a query:-

SELECT MAX(salary) AS max_salaryFROM employee;

In this example:

The MAX() would help in calculating the maximum value in the salary Column of the employee table.

AS max Salary would help in assigning an alias max _ salary for getting the results, which can be useful for the readability or even further processing in your particular application.

This particular query would return a single row with the highest salary which is found in the tables called Employees under the column alias max_salary.

Here is also a java based program given of how you can retrieve the maximum value from a particular Database by using the JDBC:-

Import java.sql.Connection;

Import java.sql.DriverManager;

Import java.sql.PreparedStatement;

Import java.sql.ResultSet;

Import java.sql.SQLException;

Public class MaxValueExample {

    // JDBC URL, username, and password of MySQL server

    Private static final String JDBC_URL = “jdbc:mysql://localhost:3306/your_database_name”;

    Private static final String JDBC_USER = “your_username”;

    Private static final String JDBC_PASSWORD = “your_password”;

    // SQL query to retrieve maximum salary from employee table

    Private static final String SQL_QUERY = “SELECT MAX(salary) AS max_salary FROM employee”;

    Public static void main(String[] args) {

        // Establishing a connection to the database

        Try (Connection connection = DriverManager.getConnection(JDBC_URL, JDBC_USER, JDBC_PASSWORD);

             PreparedStatement statement = connection.prepareStatement(SQL_QUERY);

             ResultSet resultSet = statement.executeQuery()) {

            // Processing the result set

            If (resultSet.next()) {

                Double maxSalary = resultSet.getDouble(“max_salary”);

                System.out.println(“Maximum salary in the employee table: “ + maxSalary);

            } else {

                System.out.println(“No records found in the employee table.”);

            }

        } catch (SQLException e) {

            e.printStackTrace();

        }

    }

}

Here is also a Python-based example given below by using the MySQL-connector library to connect to a MySQL database and retrieving the maximum Salary from an employee table:-

Import mysql.connector

# Database connection configuration

Config = {

    ‘host’: ‘localhost’,

    ‘user’: ‘your_username’,

    ‘password’: ‘your_password’,

    ‘database’: ‘your_database_name’

}

# SQL query to retrieve maximum salary

Sql_query = “SELECT MAX(salary) AS max_salary FROM employee”

Try:

    # Establishing a connection to the database

    Connection = mysql.connector.connect(**config)

    # Creating a cursor object using the connection

    Cursor = connection.cursor()

    # Executing the SQL query

    Cursor.execute(sql_query)

    # Fetching the result

    Result = cursor.fetchone()

    # Processing the result

    If result:

        Max_salary = result[0]

        Print(f”Maximum salary in the employee table: {max_salary}”)

    Else:

        Print(“No records found in the employee table.”)

Except mysql.connector.Error as error:

    Print(f”Error connecting to MySQL: {error}”)

Finally:

    # Closing cursor and connection

    If ‘cursor’ in locals() and cursor:

        Cursor.close()

    If ‘connection’ in locals() and connection.is_connected():

        Connection.close()