แต่ละหลักสูตรมีกี่หลักสูตร? แสดงแผนภูมิแท่งให้ฉันดู ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many courses for each course description? Show me a bar chart.It is not neccessary to use all the tables.
 DEPARTMENT:  DEPT_CODE [ varchar(10)]  DEPT_NAME [ varchar(30)]  SCHOOL_CODE [ varchar(8)]  EMP_NUM [ int]  DEPT_ADDRESS [ varchar(20)]  DEPT_EXTENSION [ varchar(4)] 
SELECT CRS_DESCRIPTION, COUNT(CRS_DESCRIPTION) FROM CLASS AS T1 JOIN EMPLOYEE AS T2 ON T1.PROF_NUM = T2.EMP_NUM JOIN COURSE AS T3 ON T1.CRS_CODE = T3.CRS_CODE JOIN PROFESSOR AS T4 ON T2.EMP_NUM = T4.EMP_NUM GROUP BY CRS_DESCRIPTION