Table schema:
CREATE TABLE CLASS (crs_code VARCHAR); CREATE TABLE department (dept_name VARCHAR, dept_code VARCHAR); CREATE TABLE course (dept_code VARCHAR, crs_code VARCHAR, crs_credit INTEGER)

Question: Find the name of the department that offers the largest number of credits of all classes.
SQL: SELECT T3.dept_name FROM course AS T1 JOIN CLASS AS T2 ON T1.crs_code = T2.crs_code JOIN department AS T3 ON T1.dept_code = T3.dept_code GROUP BY T1.dept_code ORDER BY SUM(T1.crs_credit) DESC LIMIT 1