JAVA

Richest Customer Wealth

class Solution {
    public int maximumWealth(int[][] accounts) {
        int max = 0;
        for (int[] account : accounts) {
            int sum = 0;
            for (int i : account) {
                sum += i;
                if (sum > max) max = sum;
            }
        }
        return max;
    }
}

Richest Customer Wealth

    SELECT max(personbalance)  
    FROM  
        (  
        Select   
            sum(balance)  
        FROM  
            persons  
            join accountof  
            join bankaccounts  
        GROUP BY persons.id  
    )