题解 | 统计所有课程参加培训人次
统计所有课程参加培训人次
https://www.nowcoder.com/practice/98aad5807cf34a3b960cc8a70ce03f53
SELECT
(SELECT COUNT(DISTINCT staff_id) FROM cultivate_tb WHERE FIND_IN_SET('course1', course)) +
(SELECT COUNT(DISTINCT staff_id) FROM cultivate_tb WHERE FIND_IN_SET('course2', course)) +
(SELECT COUNT(DISTINCT staff_id) FROM cultivate_tb WHERE FIND_IN_SET('course3', course))
AS staff_nums;
#sql刷题##sql笔试#
