Oracle 行转列(pivot、wm_concat、decode)使用总结

CREATE TABLE CC
(Student NVARCHAR2(2),Course NVARCHAR2(2),Score INT
);

INSERT into CC
select N'张三',N'语文',78 from dual union all
select N'张三',N'数学',87 from dual union all
select N'张三',N'英语',82 from dual union all
select N'张三',N'物理',90 from dual union all
select N'李四',N'语文',65 from dual union all
select N'李四',N'数学',77 from dual union all
select N'李四',N'英语',65 from dual union all
select N'李四',N'物理',85 from dual ;
commit;

李四 77 85 65 65 292
张三 87 90 82 78 337

SELECT STUDENT,WM_CONCAT(SCORE),SUM(SCORE) FROM CC GROUP BY STUDENT;

SELECT KIN.*,
KIN.a+KIN.b+KIN.c+KIN.d AS TOTAL
FROM
(SELECT                               *
FROM CC PIVOT ( MAX(SCORE) FOR COURSE IN ('语文' AS A , '数学' AS B, '英语' AS C,'物理' AS D) )
) KIN;

SELECT
student,
MAX(decode(COURSE, '语文', SCORE)) A,
MAX(DECODE(COURSE, '数学', SCORE)) B,
MAX(DECODE(COURSE, '英语', SCORE)) C,
MAX(DECODE(COURSE, '物理', SCORE)) D,
SUM(SCORE) TOTAL
FROM
CC
GROUP BY
student;