mysql统计各个科目的分数、总分、平均分

SELECT s.id, s.name,
max(case when g.kemu='语文' then score else 0 end) as 语文,
max(case when g.kemu='数学' then score else 0 end) as 数学,
max(case when g.kemu='英语' then score else 0 end) as 英语,
sum(score) as 总分,
avg(score) as 平均分
from student s LEFT JOIN grade g ON s.id = g.s_id GROUP BY s.id;

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原文链接：https://blog.csdn.net/weijiaxin2010/article/details/88065351