sql collapse函数的高级用法有哪些

使用聚合函数进行分组

SELECT name, SUM(score) as total_scoreFROM studentsGROUP BY name

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_scoreFROM studentsGROUP BY name

SELECT name, SUM(score) as total_scoreFROM studentsGROUP BY nameORDER BY total_score DESC

SELECT name, SUM(score) as total_scoreFROM studentsGROUP BY nameHAVING total_score > 200

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