题解 | 查询培训指定课程的员工信息
查询培训指定课程的员工信息
https://www.nowcoder.com/practice/a0ef4574056e4a219ee7d651ba82efef
select st.staff_id,st.staff_name from staff_tb as st left join cultivate_tb as ct on st.staff_id = ct.staff_id where substring_index(course,',',-1) = 'course3'
