whaifree
d9e64a81a6
- 新增 AbstractClass、Singleton 和 staticClass 类 - 添加 LeetCode3、LeetCode5、LeetCode20 等多个算法题解 - 新增 RedisDataTest 类，增加 Redis 地理位置相关测试 - 添加 SQL相关文件，包括学生表创建和查询、临时表使用等- 修改 ChainPattern、FunctionInterfaceDemo 和 FutureRelative 类
34 lines
734 B
SQL
34 lines
734 B
SQL
-- 使用临时表
|
|
|
|
-- 计算平均分
|
|
WITH
|
|
avg_score AS (
|
|
SELECT AVG(score1 + score2 + score3) AS avg_sum
|
|
FROM students_241020
|
|
),
|
|
-- 子查询，计算每个学生的总分
|
|
student_scores AS (
|
|
SELECT id, class, score1 + score2 + score3 AS `sum`
|
|
FROM students_241020
|
|
)
|
|
|
|
|
|
-- 查询总分高于平均分的班级及其学生数
|
|
SELECT
|
|
class, -- 选择班级字段
|
|
COUNT(id) AS `count` -- 统计每个班级的学生数
|
|
FROM
|
|
student_scores
|
|
WHERE
|
|
`sum` > (SELECT avg_sum FROM avg_score)
|
|
GROUP BY
|
|
class -- 按班级分组
|
|
ORDER BY
|
|
`count` DESC -- 按学生数降序排列
|
|
LIMIT 3; -- 限制结果返回前三条记录
|
|
|
|
|
|
WITH avg_score as
|
|
(SELECT * FROM test_table)
|
|
SELECT * FROM avg_score;
|