MySQL行转列完整SQL示例
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MySQL行转列完整SQL示例
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-- SQL行轉列
create table student_scores(username VARCHAR(10),-- 學生姓名subject varchar(10),-- 科目名稱score int(3)-- 成績
)INSERT into student_scores values('張三','語文',86);
INSERT into student_scores values('張三','數學',96);
INSERT into student_scores values('張三','英語',76);
INSERT into student_scores values('李四','語文',59);
INSERT into student_scores values('李四','數學',61);
INSERT into student_scores values('李四','英語',88);-- 行轉列
select username,
max(case subject when '語文' THEN score end) as '語文',
max(case subject when '數學' THEN score end) as '數學',
max(case subject when '英語' THEN score end) as '英語'
FROM student_scores
GROUP BY username
UNION
select username,sum(chinese),sum(math),sum(english) from(
select '單科總成績' username,
sum(case subject when '語文' THEN score end) as chinese,
sum(case subject when '數學' THEN score end) as math,
sum(case subject when '英語' THEN score end) as english
FROM student_scores
GROUP BY username )t
GROUP BY username
?
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