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(
CASE
WHEN course IS NULL THEN 0
ELSE LENGTH (course) - LENGTH (REPLACE (course, ',', '')) + 1
END
) AS staff_nums
FROM
cultivate_tb;
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