In a banking application, you need to implement a SQL query to calculate the total balance for each customer across multiple accounts. How would you approach this problem using SQL?

To calculate the total balance for each customer across multiple accounts in a banking application using SQL, you would typically use a JOIN statement with GROUP BY and SUM functions. This approach involves joining the tables that contain customer information and account balances, grouping the results by customer ID, and then summing up the balances to get the total balance for each customer. For example, if you have separate tables for customers and accounts, you would join these tables on the customer ID, group by customer ID, and use the SUM function to calculate the total balance. This method provides an efficient way to aggregate data across multiple accounts for each customer.