如何轉換爲varchar並將％符號添加到SQL

我一直拉着我的頭髮來解決這個問題..我可以將其轉換爲varchar並將％符號添加到結果？如何轉換爲varchar並將％符號添加到SQL

我已經將下面的代碼放在查詢中，並試圖將其轉換，但不斷收到我不知道如何解決的錯誤。有人可以提出一些建議，如何簡化和防止零問題的分歧。

select 'Conversion Rate' as Type, 
(
SELECT 
(
    COALESCE 
    (     
     CAST(CAST(nullif(t.ConvertedTrials,0) AS NUMERIC(18,2))/(CAST(nullif(t.UnconvertedTrials,0) AS NUMERIC(18,2))) * 100 as decimal(10,2)) 
     , 
     0 
    ) 
) AS Percentage 

FROM (
    SELECT 
    UnconvertedTrials = (
     SELECT count(*) FROM 
     (
     select memberid from membership where discountcodeid = '79a7fd7c-9ebe-4ec0-8ac0-95ea274f1f64' Group by membership.memberid 
     ) as a 
     ), 
    ConvertedTrials = (
     SELECT count(*) FROM 
     (
      SELECT membership.memberid 
      FROM Membership, Package 
      WHERE membership.PackageId = Package.Id 
      AND Package.PackageTypeId != 1 
      AND membership.memberid in (select memberid from membership where discountcodeid = '79a7fd7c-9ebe-4ec0-8ac0-95ea274f1f64') 
      Group by membership.memberid 
     ) as b 
     ) 
) as t 
) as Total

來源

2016-11-09 Christopher Pettigrew

你能展示你的結果會是什麼樣子嗎？另外，你得到的錯誤是什麼？ –

鑄造代碼是什麼樣的？另外，儘管你可以給字符串添加一個百分比符號，但對於這些數據的目的地而言，這確實更令人擔憂。這是一個顯示任務。 –

select 'Conversion Rate' as Type, 
RTRIM(CAST((
SELECT 
(
    COALESCE 
    (     
     CAST(CAST(nullif(t.ConvertedTrials,0) AS NUMERIC(18,2))/(CAST(nullif(t.UnconvertedTrials,0) AS NUMERIC(18,2))) * 100 as decimal(10,2)) 
     , 
     0 
    ) 
) AS Percentage 

FROM (
    SELECT 
    UnconvertedTrials = (
     SELECT count(*) FROM 
     (
     select memberid from membership where discountcodeid = '79a7fd7c-9ebe-4ec0-8ac0-95ea274f1f64' Group by membership.memberid 
     ) as a 
     ), 
    ConvertedTrials = (
     SELECT count(*) FROM 
     (
      SELECT membership.memberid 
      FROM Membership, Package 
      WHERE membership.PackageId = Package.Id 
      AND Package.PackageTypeId != 1 
      AND membership.memberid in (select memberid from membership where discountcodeid = '79a7fd7c-9ebe-4ec0-8ac0-95ea274f1f64') 
      Group by membership.memberid 
     ) as b 
     ) 
) as t 
) AS NVARCHAR(50))) + '%' as Total

您的實際比例是相當大的子查詢，這是很難看到如何把它們放在括號內 - 我有大約10老話 - 是什麼好了嗎？

也許它更容易包住整個查詢在另一個選擇，例如，

SELECT A,B FROM (<your query>) AS AQUERY

（這應該給完全相同的結果作爲查詢） - 在格式化B，則工作外部查詢

這是我做的第二種方式

SELECT ORIGINAL.Type, RTRIM(CAST(ORIGINAL.Total as varchar(80))) + '%' AS Total 
FROM 
(
select 'Conversion Rate' as Type, 
(
SELECT 
(
    COALESCE 
    (     
     CAST(CAST(nullif(t.ConvertedTrials,0) AS NUMERIC(18,2))/(CAST(nullif(t.UnconvertedTrials,0) AS NUMERIC(18,2))) * 100 as decimal(10,2)) 
     , 
     0 
    ) 
) AS Percentage 

FROM (
    SELECT 
    UnconvertedTrials = (
     SELECT count(*) FROM 
     (
     select memberid from membership where discountcodeid = '79a7fd7c-9ebe-4ec0-8ac0-95ea274f1f64' Group by membership.memberid 
     ) as a 
     ), 
    ConvertedTrials = (
     SELECT count(*) FROM 
     (
      SELECT membership.memberid 
      FROM Membership, Package 
      WHERE membership.PackageId = Package.Id 
      AND Package.PackageTypeId != 1 
      AND membership.memberid in (select memberid from membership where discountcodeid = '79a7fd7c-9ebe-4ec0-8ac0-95ea274f1f64') 
      Group by membership.memberid 
     ) as b 
     ) 
) as t 
) as Total 
) ORIGINAL

來源

2016-11-09 17:02:23 Cato

如何轉換爲varchar並將％符號添加到SQL

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