instruction: How many courses for each course description? Show me a stacked bar chart. The x-axis is course description and group by instructor's name.
response: 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 GROUP BY EMP_FNAME, CRS_DESCRIPTION