如何转换为varchar并将％符号添加到SQL

我一直拉着我的头发来解决这个问题..我可以将其转换为varchar并将％符号添加到结果？如何转换为varchar并将％符号添加到SQL

我已经将下面的代码放在查询中，并试图将其转换，但不断收到我不知道如何解决的错误。有人可以提出一些建议，如何简化和防止零问题的分歧。

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

来源

2016-11-09 Christopher Pettigrew

你能展示你的结果会是什么样子吗？另外，你得到的错误是什么？ –

铸造代码是什么样的？另外，尽管你可以给字符串添加一个百分比符号，但对于这些数据的目的地而言，这确实更令人担忧。这是一个显示任务。 –

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

您的实际比例是相当大的子查询，这是很难看到如何把它们放在括号内 - 我有大约10老话 - 是什么好了吗？

也许它更容易包住整个查询在另一个选择，例如，

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

（这应该给完全相同的结果作为查询） - 在格式化B，则工作外部查询

这是我做的第二种方式

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

来源

2016-11-09 17:02:23 Cato

如何转换为varchar并将％符号添加到SQL

回答

相关问题