How can I resolve the issue of “this is incompatible with SQL_ mode = only_full_group_by”?

In the context of SQL, this particular error message has occurred because every column in the SELECT Clause that is not an aggregate function must be incorporated in the GROUP BY Clause. It is possible that the “transaction date” is not a part of an aggregate function and it is also possible that it is not included in the “GROUP BY” clause which possibly leads you to the error.

For troubleshooting this particular issue you would need to ensure that all the nonaggregate columns in the SELECT Clause are either part of the GROUP BY clause or you should use the aggregate function properly.

Here is the right query given. By modifying your query like the following query you can easily get your desired result:-

SELECT customer_id, 

       SUM(total_amount) AS total_sales, 

       MAX(transaction_date) AS latest_transaction_date

FROM transactions

GROUP BY customer_id;

By structuring your particular query like the above query, you can easily get rid of the issue “this is incompatible with SQL_ mode = only_full_group_by” and get the desired results.

Here is a Java example given below which would demonstrate how you can handle the situation programmatically, including the issues related to connectivity of the MySQL database, implementation to the compliant SQL query a,nd processing the results:-

Import java.sql.Connection;

Import java.sql.DriverManager;

Import java.sql.PreparedStatement;

Import java.sql.ResultSet;

Import java.sql.SQLException;

Public class SalesReport {

    Public static void main(String[] args) {

        // Database connection parameters

        String jdbcURL = “jdbc:mysql://localhost:3306/your_database”;

        String username = “your_username”;

        String password = “your_password”;

        // SQL query

        String sql = “SELECT customer_id, “

                   + “SUM(total_amount) AS total_sales, “

                   + “MAX(transaction_date) AS latest_transaction_date “

                   + “FROM transactions “

                   + “GROUP BY customer_id”;

        Try (Connection connection = DriverManager.getConnection(jdbcURL, username, password);

             PreparedStatement statement = connection.prepareStatement(sql);

             ResultSet resultSet = statement.executeQuery()) {

            // Process the result set

            While (resultSet.next()) {

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

                Double totalSales = resultSet.getDouble(“total_sales”);

                String latestTransactionDate = resultSet.getString(“latest_transaction_date”);

                // Output the results

                System.out.println(“Customer ID: “ + customerId);

                System.out.println(“Total Sales: “ + totalSales);

                System.out.println(“Latest Transaction Date: “ + latestTransactionDate);

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

            }

        } catch (SQLException e) {

            e.printStackTrace();

        }

    }

}