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

create table student_score(

name varchar2(20),

subject varchar2(20),

score number(4,1)

);

-----插入測(cè)試數(shù)據(jù)

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

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

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

-----decode行轉(zhuǎn)列

select name "姓名",

sum(decode(subject, '語(yǔ)文', nvl(score, 0), 0)) "語(yǔ)文",

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

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

from student_score

group by name;

------ case when 行轉(zhuǎn)列

select name "姓名",

sum(case when subject='語(yǔ)文'

then nvl(score,0)

else 0

end) "語(yǔ)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(yǔ)'

then nvl(score,0)

else 0

end) "英語(yǔ)"

from student_score

group by name;

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