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 sum(if(course like '%,%,%',3,0)) +sum(if(course like '%,%' and !(course like '%,%,%'),2,0)) +sum(if(!(course like '%,%,%')and !(course like '%,%')and course is not null,1,0)) staff_nums from cultivate_tb
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