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