分析涵数cube?

[lgyqd]

group by cube(area_code,bill_month)中cube的作用是？

[沝林]

cube 不是分析函数，它是group 的子句，作用是分别列出每个分组的数据然后求出合计，最后求出所有分组的合计

SELECT DECODE(GROUPING(department_name), 1, 'All Departments',
department_name) AS department_name,
DECODE(GROUPING(job_id), 1, 'All Jobs', job_id) AS job_id,
COUNT(*) "Total Empl", AVG(salary) * 12 "Average Sal"
FROM employees e, departments d
WHERE d.department_id = e.department_id
GROUP BY CUBE (department_name, job_id);

DEPARTMENT_NAME JOB_ID Total Empl Average Sal
------------------------------ ---------- ---------- -----------
Accounting AC_ACCOUNT 1 99600
Accounting AC_MGR 1 144000
Accounting All Jobs 2 121800
Administration AD_ASST 1 52800
.
.
.
All Departments ST_MAN 5 87360
All Departments All Jobs 107 77798.1308