How to write an SQL query to retrieve data from an order table?

 In the context of SQL, you can use the ORDER BY 1 for this particular scenario. The ORDER BY 1 in SQL is used to sort the results of a query by one or more columns. The syntax ORDER BY 1 would help you in specifying the results and sorted by the first column in the SELECT statement. The positional reference can simplify the query but may reduce readability and also maintainability, especially in queries such as complex queries or when column order changes.

Here is the SQL query given:-

SELECT order_id, customer_id, order_date, total_amount

FROM orders

ORDER BY 3;

For better readability and maintainability, you are recommended to use the explicit Column names in the ORDER BY Clause. Here is the improved SQL query given:-

SELECT order_id, customer_id, order_date, total_amount

FROM orders

ORDER BY order_date;

Here is also an example given in Java programming language which connects to a particular Database, retrieves the data from the Order table, and sorts the results by the order_date Column. This example would use the JDBC to interact with the database:-

Import java.sql.Connection;

Import java.sql.DriverManager;

Import java.sql.PreparedStatement;

Import java.sql.ResultSet;

Import java.sql.SQLException;

Public class OrderRetrieval {

    // Database URL, username, and password

    Private static final String DB_URL = “jdbc:mysql://localhost:3306/ecommerce_db”;

    Private static final String DB_USERNAME = “root”;

    Private static final String DB_PASSWORD = “password”;

    Public static void main(String[] args) {

        Connection connection = null;

        PreparedStatement preparedStatement = null;

        ResultSet resultSet = null;

        Try {

            // Establish the connection to the database

            Connection = DriverManager.getConnection(DB_URL, DB_USERNAME, DB_PASSWORD);

            // SQL query to retrieve and sort orders by order_date

            String sqlQuery = “SELECT order_id, customer_id, order_date, total_amount FROM orders ORDER BY order_date”;

            // Create a PreparedStatement object

            preparedStatement = connection.prepareStatement(sqlQuery);

            // Execute the query

            resultSet = preparedStatement.executeQuery();

            // Process the result set

            System.out.println(“Order ID | Customer ID | Order Date | Total Amount”);

            System.out.println(“----------------------------------------------“);

            While (resultSet.next()) {

                Int orderId = resultSet.getInt(“order_id”);

                Int customerId = resultSet.getInt(“customer_id”);

                Java.sql.Date orderDate = resultSet.getDate(“order_date”);

                Double totalAmount = resultSet.getDouble(“total_amount”);

                // Print the retrieved data

                System.out.printf(“%-9d | %-12d | %-11s | %.2f%n”, orderId, customerId, orderDate, totalAmount);

            }

        } catch (SQLException e) {

            // Handle SQL exception

            e.printStackTrace();

        } finally {

            // Close the resources

            Try {

                If (resultSet != null) resultSet.close();

                If (preparedStatement != null) preparedStatement.close();

                If (connection != null) connection.close();

            } catch (SQLException e) {

                e.printStackTrace();

            }

        }

    }

}

Explanation

Database connection setup

This program would use the JDBC to connect with the SQL database.

SQL query

The SQL query contains the SQL query for retrieving all the columns from the order table and sorting the results by the order date column.

Prepared statement

A prepared statement object is created to implement the SQL query.

Implementing the query

Now you can implement the query.