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這篇文章主要講解了MySQL如何實(shí)現(xiàn)橫縱表相互轉(zhuǎn)化,內(nèi)容清晰明了,對(duì)此有興趣的小伙伴可以學(xué)習(xí)一下,相信大家閱讀完之后會(huì)有幫助。
本文實(shí)例講述了MySQL橫縱表相互轉(zhuǎn)化操作實(shí)現(xiàn)方法。分享給大家供大家參考,具體如下:
先創(chuàng)建一個(gè)成績(jī)表(縱表)
create table user_score ( name varchar(20), subjects varchar(20), score int ); insert into user_score(name,subjects,score) values('張三','語(yǔ)文',60); insert into user_score(name,subjects,score) values('張三','數(shù)學(xué)',70); insert into user_score(name,subjects,score) values('張三','英語(yǔ)',80); insert into user_score(name,subjects,score) values('李四','語(yǔ)文',90); insert into user_score(name,subjects,score) values('李四','數(shù)學(xué)',100);
再創(chuàng)建一個(gè)成績(jī)表(橫表)
create table user_score2 ( name varchar(20), yuwen int, shuxue int, yingyu int ); insert into user_score2(name,yuwen,shuxue,yingyu) values('張三',60,70,80); insert into user_score2(name,yuwen,shuxue,yingyu) values('李四',90,100,0);
縱表轉(zhuǎn)橫表
select name,sum(case subjects when '語(yǔ)文' then score else 0 end) as '語(yǔ)文',sum(case subjects when '數(shù)學(xué)' then score else 0 end) as '數(shù)學(xué)', sum(case subjects when '英語(yǔ)' then score else 0 end) as '英語(yǔ)'from user_score group by name;
縱表轉(zhuǎn)橫表
SELECT name,'yuwen' AS subjects,yuwen AS score FROM user_score2 UNION ALL SELECT name,'shuxue' AS subjects,shuxue AS score FROM user_score2 UNION ALL SELECT name,'yingyu' AS subjects,yingyu AS score FROM user_score2 ORDER BY name,subjects DESC;
看完上述內(nèi)容,是不是對(duì)MySQL如何實(shí)現(xiàn)橫縱表相互轉(zhuǎn)化有進(jìn)一步的了解,如果還想學(xué)習(xí)更多內(nèi)容,歡迎關(guān)注億速云行業(yè)資訊頻道。
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