题解 | SQL274 考试分数(四)
WITH t1 AS (
SELECT
job,
COUNT(job) AS num
FROM grade
GROUP BY job
),
t2 AS (
SELECT
job,
FLOOR((num + 1) / 2) AS start,
CEIL((num + 1) / 2) AS end
FROM t1
ORDER BY job ASC
)
SELECT * FROM t2;
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