Mysql满意度调查分组去除最高最低求平均分的实现思路

-- 调查打分表
CREATE TABLE survey_scores (
    score_id INT AUTO_INCREMENT PRIMARY KEY,
    department VARCHAR(50), -- 部门
    employee_id INT,        -- 员工ID
    score DECIMAL(5, 2)     -- 满意度打分（0-10分）
);

-- 插入调查打分数据
INSERT INTO survey_scores (department, employee_id, score) VALUES
('HR', 1, 8.5),
('HR', 2, 9.0),
('HR', 3, 7.0),
('HR', 4, 8.0),
('HR', 5, 9.5),
('Engineering', 6, 7.5),
('Engineering', 7, 8.0),
('Engineering', 8, 6.5),
('Engineering', 9, 9.0),
('Engineering', 10, 8.5),
('Sales', 11, 6.0),
('Sales', 12, 7.0),
('Sales', 13, 6.5),
('Sales', 14, 8.0),
('Sales', 15, 7.5);

-- 第一步：标记每个部门的最高分和最低分
WITH ranked_scores AS (
    SELECT
        department,
        score,
        ROW_NUMBER() OVER (PARTITION BY department ORDER BY score ASC) AS asc_rank,
        ROW_NUMBER() OVER (PARTITION BY department ORDER BY score DESC) AS desc_rank
    FROM
        survey_scores
)
-- 第二步：过滤掉每个部门的最高分和最低分，计算平均分
SELECT
    department,
    AVG(score) AS avg_score
FROM
    ranked_scores
WHERE
    asc_rank > 1 AND desc_rank > 1 -- 去除最高分和最低分
GROUP BY
    department;