用decode函數(shù)，或者case when實(shí)現(xiàn)行轉(zhuǎn)列 Oracle ----創(chuàng)建測試表create table student_score( name varchar2(20), subject varchar2(20), score number(4,1) ); -----插入測試數(shù)據(jù)insert into student_score (name,subject,score)values('張三','語文',78); in

用decode函數(shù)，或者case when實(shí)現(xiàn)行轉(zhuǎn)列

Oracle

----創(chuàng)建測試表

create table student_score(

name varchar2(20),

subject varchar2(20),

score number(4,1)

);

-----插入測試數(shù)據(jù)

insert into student_score (name,subject,score)values('張三','語文',78);

insert into student_score (name,subject,score)values('張三','數(shù)學(xué)',88);

insert into student_score (name,subject,score)values('張三','英語',98);

insert into student_score (name,subject,score)values('李四','語文',89);

insert into student_score (name,subject,score)values('李四','數(shù)學(xué)',76);

insert into student_score (name,subject,score)values('李四','英語',90);

insert into student_score (name,subject,score)values('王五','語文',99);

insert into student_score (name,subject,score)values('王五','數(shù)學(xué)',66);

insert into student_score (name,subject,score)values('王五','英語',91);

-----decode行轉(zhuǎn)列

select name "姓名",

sum(decode(subject, '語文', nvl(score, 0), 0)) "語文",

sum(decode(subject, '數(shù)學(xué)', nvl(score, 0), 0)) "數(shù)學(xué)",

sum(decode(subject, '英語', nvl(score, 0), 0)) "英語"

from student_score

group by name;

------ case when 行轉(zhuǎn)列

select name "姓名",

sum(case when subject='語文'

then nvl(score,0)

else 0

end) "語文",

sum(case when subject='數(shù)學(xué)'

then nvl(score,0)

else 0

end) "數(shù)學(xué)",

sum(case when subject='英語'

then nvl(score,0)

else 0

end) "英語"

from student_score

group by name;

本文原創(chuàng)發(fā)布php中文網(wǎng)，轉(zhuǎn)載請注明出處，感謝您的尊重！

總結(jié)

以上是生活随笔為你收集整理的oracle中创建函数行变列,oracle decode 函数实现行转列的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。