Question

我有一个选择：

select deptno,12*month+year,salvalue 
from career join salary on career.empno = salary.empno 
and startdate<=to_date('01-'||to_CHAR(month)||'-'||to_CHAR(year),'dd-mm-yyyy') 
and (
      enddate>=to_date('01-'||to_CHAR(month)||'-'||to_CHAR(year),'dd-mm-yyyy') 
      or enddate is null
    )

它的结果是：

+---------+----------------+----------+
| deptno  | 12*month+year  | salvalue |
+---------+----------------+----------+
| 30      | 2067           |     3601 |
| 30      | 2091           |     3671 |
| 30      | 2091           |     3531 |
| 40      | 2032           |     1938 |
| 40      | 2044           |     1988 |
| 10      | 2106           |     8117 |
| 10      | 2118           |     8117 |
| 10      | 2130           |     8217 |
+---------+----------------+----------+

我需要得到deptno，其中最大12 *月+年的salvalues总和最大。在这张表中，deptno是10：

deptno = 30 max（12个月+年）= 2091 sum（salvalue）= 3671 + 3531 = 7202

deptno = 40 max（12个月+年）= 2044 sum（salvalue）= 1988

deptno = 10 max（12个月+年）= 2130 sum（salvalue）= 8217

Answer 1

您可以在deptno的外部查询分组中执行此操作。像

这样的东西

SELECT deptno
FROM
(
select deptno,
12*month+year as computed_column,
salvalue 
from career join salary on career.empno = salary.empno 
and startdate<=to_date('01-'||to_CHAR(month)||'-'||to_CHAR(year),'dd-mm-yyyy') 
and (
      enddate>=to_date('01-'||to_CHAR(month)||'-'||to_CHAR(year),'dd-mm-yyyy') 
      or enddate is null
    )
) tab
GROUP BY deptno
HAVING SUM(salvalue) = MAX(computed_column);

Answer 2

您可以尝试

WITH
MaxSalarySum AS (
  SELECT
    deptNo
    , twelveMonthsPlusYear
    , SUM(salValue) salValueSum
  FROM (
    select deptno, 12*month+year twelveMonthsPlusYear, salvalue 
    from career join salary on career.empno = salary.empno 
    and startdate<=to_date('01-'||to_CHAR(month)||'-'||to_CHAR(year),'dd-mm-yyyy') 
    and (
          enddate>=to_date('01-'||to_CHAR(month)||'-'||to_CHAR(year),'dd-mm-yyyy') 
          or enddate is null
        )
  )
  GROUP BY deptNo, twelveMonthsPlusYear
)
SELECT
  deptNo
FROM MaxSalarySum
WHERE salValueSum = (SELECT MAX(salValueSum) FROM MaxSalarySum)
;

不是特别优雅 - 但相当通用。请参阅（基于中间结果）实际操作：SQL Fiddle

请评论是否需要调整/更多细节。

SQL。获取值为MAX的SUM

2 个答案: