我需要一列顯示值的行＃

Question

「顯示與每個本科相關專業的號碼，只包括具有專業2和10之間的節目」

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

我的「專業學生數「專欄作爲主要名稱出現，我如何將其更改爲與大學的prg_field專欄相關的值？

Answer 1

如果我理解正確，您想要查找每個學院的不同prg_name的編號。如果這是正確的，你可以得到不同的集學院/專業，然後計算每個學院的專業如下：

;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 

有可能是另一種方式，如果你不能使用一個CTE來格式化這個。 希望這有助於。

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; 

如果有重複prg_name當時的使用COUNT(DISTINCT prg_name)代替COUNT(prg_name)頂部和底部。

Answer 3

考慮派生表子查詢：

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