mysql橫表縱錶轉換

一.橫錶轉縱表

select id,姓名,'語文' as SUBJECT,語文 as 'score' from hb 
UNION
select id,姓名,'數學' as SUBJECT,數學 as 'score' from hb 
UNION
select id,姓名,'英語' as SUBJECT,英語 as 'score' from hb 

二.縱錶轉橫表

select name as '姓名',MAX(CASE `subject` WHEN '語文' then score else 0 end) 語文,
MAX(CASE `subject` WHEN '數學' then score else 0 end) 數學,
MAX(CASE `subject` WHEN '英語' then score else 0 end) 英語 from sb group by name