如何在SQL Server中将一列数字转换为一个单元格？ （查找所有小于1000的素数）

Question

我需要写一个查询来打印所有小于或等于1000的素数。我需要将结果打印到一行中，并使用＆字符作为分隔符（而不是空格）。像这样：

2&3&5&7&11&13

这是我的代码（Number的数据类型为int，所以我需要将其更改为varchar，以便＆字符可以与Number一起显示在一个单元格中：]

with temp as
(select 2 as Number
union all 
select Number + 1 from temp where Number<1000)
, temptwo as
(select * from temp t1
where NOT EXISTS
(select 1 from temp t2
where t1.Number > t2.Number
and t1.Number % t2.Number = 0))
, tempthree as
(select Cast(Number AS Varchar) as Number from temptwo)
select 
STUFF((SELECT  '&' + Number
            FROM tempthree tt
            WHERE  tt.Number = t.Number
            FOR XML PATH('')), 1, 1, '') 
FROM tempthree t
OPTION (MAXRECURSION 0)

但是它实际上不起作用。我不知道是什么问题？到目前为止，它运行良好：

with temp as
(select 2 as Number
union all 
select Number + 1 from temp where Number<1000)
, temptwo as
(select * from temp t1
where NOT EXISTS
(select 1 from temp t2
where t1.Number > t2.Number
and t1.Number % t2.Number = 0))
select Cast(Number AS Varchar) as Number from temptwo
OPTION (MAXRECURSION 0)

但是它只打印出这样的内容：

2
3
5
7
11
13
...

但这不是我想要的。谁能帮忙？

Answer 1

您的方法可以确定质数。您只是缺少字符串聚合。