sql collapse函数的高级用法有哪些

1. 使用聚合函数进行分组

SELECT name, SUM(score) as total_score
FROM students
GROUP BY name

2. 使用条件进行分组

SELECT 
    name,
    SUM(CASE WHEN subject='Math' THEN score ELSE 0 END) as math_score,
    SUM(CASE WHEN subject='English' THEN score ELSE 0 END) as english_score
FROM students
GROUP BY name

3. 使用聚合函数进行排序

SELECT name, SUM(score) as total_score
FROM students
GROUP BY name
ORDER BY total_score DESC

4. 使用聚合函数进行筛选

SELECT name, SUM(score) as total_score
FROM students
GROUP BY name
HAVING total_score > 200

5. 使用窗口函数

SELECT name, score, SUM(score) OVER (PARTITION BY name) as total_score
FROM students