Find the name and credit score of the customers who have some loans.
SELECT DISTINCT T1.cust_name ,  T1.credit_score FROM customer AS T1 JOIN loan AS T2 ON T1.cust_id  =  T2.cust_id
customers who have some loans refers to JOIN operation between customer and loan tables on customer ID; name and credit score of the customers refers to cust_name and credit_score fields; DISTINCT is used to eliminate duplicate entries.