Oracle分析函数八——CUBE，ROLLUP

原创于2009年08月02日，2009年10月22日迁移至此。

Oracle

分析函数——CUBE
，
ROLLUP

CUBE

功能描述：

注意：



ROLLUP

功能描述：

注意：



如果是
ROLLUP(A, B, C)
的话，
GROUP BY
顺序

(A
、
B
、
C)

(A
、
B)

(A)

最后对全表进行
GROUP BY
操作。

如果是
GROUP BY CUBE(A, B,
C)
，
GROUP BY
顺序

(A
、
B
、
C)

(A
、
B)

(A
、
C)

(A)
，

(B
、
C)

(B)

(C)
，

最后对全表进行
GROUP BY
操作。



CREATE TABLE studentscore

(

student_name varchar2(20),

subjects varchar2(20),

score number

)

INSERT INTO studentscore
VALUES('WBQ','ENGLISH',90);

INSERT INTO studentscore
VALUES('WBQ','MATHS',95);

INSERT INTO studentscore
VALUES('WBQ','CHINESE',88);

INSERT INTO studentscore
VALUES('CZH','ENGLISH',80);

INSERT INTO studentscore VALUES('CZH','MATHS',90);

INSERT INTO studentscore
VALUES('CZH','HISTORY',92);

INSERT INTO studentscore
VALUES('CB','POLITICS',70);

INSERT INTO studentscore
VALUES('CB','HISTORY',75);

INSERT INTO studentscore
VALUES('LDH','POLITICS',80);

INSERT INTO studentscore
VALUES('LDH','CHINESE',90);

INSERT INTO studentscore
VALUES('LDH','HISTORY',95);





SELECT

student_name,

subjects,

sum(score)

FROM studentscore

GROUP BY CUBE(student_name,subjects);

等同于以下标准
SQL

SELECT NULL,subjects,SUM(score)

FROM studentscore

GROUP BY subjects

UNION

SELECT student_name,NULL,SUM(score)

FROM studentscore

GROUP BY student_name

UNION

SELECT NULL,NULL,SUM(score)

FROM studentscore

UNION

SELECT student_name,subjects,SUM(score)

FROM studentscore

GROUP BY student_name,subjects



SELECT

student_name,

subjects,

sum(score)

FROM studentscore

GROUP BY ROLLUP(student_name,subjects);



SELECT student_name,NULL,SUM(score)

FROM studentscore

GROUP BY student_name

UNION

SELECT NULL,NULL,SUM(score)

FROM studentscore

UNION

SELECT student_name,subjects,SUM(score)

FROM studentscore

GROUP BY student_name,subjects





SELECT

grouping(student_name),

grouping(subjects),

student_name,

subjects,

sum(score)

FROM studentscore

GROUP BY CUBE(student_name,subjects)

ORDER BY 1,2;



SELECT

grouping(student_name),

grouping(subjects),

student_name,

subjects,

sum(score)

FROM studentscore

GROUP BY ROLLUP(student_name,subjects)

ORDER BY 1,2;



SELECT

grouping_id(student_name,subjects),

student_name,

subjects,

sum(score)

FROM studentscore

GROUP BY CUBE(student_name,subjects)

ORDER BY 1;



SELECT

grouping_id(student_name,subjects),

student_name,

subjects,

sum(score)

FROM studentscore

GROUP BY ROLLUP(student_name,subjects)

ORDER BY 1;



SELECT

grouping(student_name),

grouping(subjects),

CASE WHEN grouping(student_name)=0 AND grouping(subjects)=1 THEN '
学生成绩合计
'

WHEN grouping(student_name)=1 AND grouping(subjects)=0 THEN '
课目成绩合计
'

WHEN grouping(student_name)=1 AND grouping(subjects)=1 THEN '
总

计
'

ELSE ''

END
SUMMARY,

student_name,

subjects,

sum(score)

FROM studentscore

GROUP BY CUBE(student_name,subjects)

ORDER BY 1,2;