Question

“显示与每个本科课程相关的专业数量。仅包括2到10个专业的课程”

SELECT prg_field AS "College", prg_name AS "Number of Majors"
FROM program 
WHERE prg_type = 'U'

我的“专业数量”栏目即将成为主要名称，如何将其更改为与学院的prg_field栏相关的值？

Answer 1

如果我理解正确，你想找到每个学院的不同prg_name的数量。如果这是正确的，你可以获得一套独特的大学/专业，然后计算每所大学的专业如下：

;WITH distSets as (
SELECT DISTINCT prg_field as 'College', prg_name as 'Number of Majors'
)

Select
    College
    ,COUNT(*) over (partition by College) as 'Count of Majors'
From distSets

如果您不能使用CTE，可能还有另一种格式化方法。希望这会有所帮助。

Answer 2

SELECT prg_field AS "College",
       COUNT( prg_name ) AS "Number of Majors"
FROM   program 
WHERE  prg_type = 'U'
GROUP BY prg_field
HAVING COUNT( prg_name ) BETWEEN 2 AND 10;

如果有prg_name个重复内容，请使用COUNT( DISTINCT prg_name )代替COUNT( prg_name )顶部和底部。

Answer 3

考虑派生表子查询：

SELECT t1.prg_field AS "College", Count(*) As "Number Of Distinct Majors"
FROM
  (SELECT DISTINCT prg_field, prg_name
   FROM program 
   WHERE prg_type = 'U') t1
GROUP BY t1.prg_field
HAVING Count(*) BETWEEN 2 AND 10

我需要为列的行显示值

3 个答案: