使用case語句來計算查找範圍

Question

我想要計算一個數字列表落入一定範圍內的次數。

數據：

advance: 
-------- 
5000 
5000 
10125 
5000 
0 
15000 
[NULL] 
7000 
8000 
[NULL] 
7000 
2275 
6000 
2000 
4000 
7000 
4000 
8000 

使用case語句和一個查詢次數。 案例聲明：

CASE 
    WHEN 
     advance > 10000 
    THEN 
     /* Display as 'High'*/ 
    WHEN 
     advance >= 5000 and advance <= 10000 
    THEN 
     /*Display as 'Moderate'*/ 
    WHEN 
     advance < 5000 
    THEN 
     /*Display as 'Low'*/ 
    ELSE 
     /*Display as 'N/A'*/ 
END 

但隨着這個轉折是，數據在單個單元格進行格式化。 我有什麼至今：

"i. Category  " + "Number" + char(13)+char(10) + 
"ii. -----------------------------------" + char(13)+char(10) + 
"iii. High:   " + /*Display High*/ + char(13)+char(10) + 
"iv. Low:   " + /*Display Low*/ + char(13)+char(10) + 
"v. Moderate: " + /*Display Moderate*/ + char(13)+char(10) + 
"vi. N/A    " + /*Display N/A */ + 

所以，最終的結果應該是這樣的：

i. Category  Number 
ii. -------------------- 
iii. High   5 
iv. Low  
v. Moderate  
vi. N/A   

我使用Sybase寫這個查詢，通常我不尋求幫助。我只是陷入困境，無法圍繞這一點纏繞我的大腦。由於

Answer 1

我不知道它的工作原理，但我希望我的想法可以幫助你

select "i. Category  " + "Number" + char(13)+char(10) + 
"ii. -----------------------------------" + char(13)+char(10) + 
"iii. High:   " + cast((select count(1) 
           from tabData 
           where advance > 10000) as varchar) + char(13)+char(10) + 
"iv. Low:   " + cast((select count(1) 
           from tabData 
           where advance >= 5000 
           and advance <= 10000) as varchar) + char(13)+char(10) + 
"v. Moderate: " + cast((select count(1) 
          from tabData 
          where advance < 5000) as varchar) + char(13)+char(10) + 
"vi. N/A    " + cast((select count(1) 
           from tabData 
           where advance is null) as varchar) 

Answer 2

你可以使用一個GROUP BY聲明：

SELECT Category, Count(Category) 
FROM (SELECT CASE 
       WHEN advance > 10000 
       THEN 'High' as Category 
       WHEN advance >= 5000 and advance <= 10000 
       THEN 'Moderate' as Category 
       WHEN advance < 5000 
       THEN 'Low' as Category 
       ELSE 
       'N/A' as Category 
      END 
     FROM your_table_name) as CategoriesResult 
GROUP BY Category 

如果你想生成一個文本值，你可以把它包裝成一個額外的查詢，追加設置到最終結果的各記錄最終文本值：

DECLARE @result AS VARCHAR(MAX) 

SET @result = "i. Category  Number" + char(13) + char(10) + 
       "ii. -----------------------------------" + char(13) + char(10) 

SELECT @result = @result + CONVERT(varchar(8), Category) 
         + " " 
         + CONVERT(VARCHAR(8), CategoryCount) + char(13) + char(10) 
FROM 
    (SELECT Category, Count(Category) as CategoryCount 
     FROM (SELECT CASE 
        WHEN advance > 10000 
         THEN 'High' as Category 
        WHEN advance >= 5000 and advance <= 10000 
         THEN 'Moderate' as Category 
        WHEN advance < 5000 
         THEN 'Low' as Category 
        ELSE 
         'N/A' as Category 
        END 
       FROM your_table_name) as CategoriesResult 
     GROUP BY Category 
    )SourceTable