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
number1+number2+number3 as staff_nums
from (
select
sum(case when course like '%1%' then 1 else 0 end ) as number1,
sum(case when course like '%2%' then 1 else 0 end ) as number2,
sum(case when course like '%3%' then 1 else 0 end ) as number3
from cultivate_tb
) temp ;
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