如何在 sql 服务器中将名称划分为行？

Question

我希望将名称作为参数传递给存储过程，当我执行此存储过程时，它应该将名称划分为行。 例如，如果通过“彼得”，则 output 应该是

磷
e
吨
e
r

Answer 1

最快的方法是使用 Tally 和SUBSTRING 。 我假设名称不会超过 100 个字符，并且（因为它是名称）它是nvarchar而不是varchar 。 然后，您可以执行以下操作：

DECLARE @Name nvarchar(100) = N'Peter';

WITH N AS(
    SELECT N
    FROM (VALUES(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL))N(N)),
Tally AS(
    SELECT TOP(DATALENGTH(@Name) / 2) --If a varchar, remove the / 2
           ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS I
    FROM N N1, N N2)
SELECT SUBSTRING(@Name,T.I,1) AS C
FROM Tally T;

Answer 2

 declare @input varchar(max); set @input = 'Peter' declare @table TABLE (char varchar(1)); while (LEN(@input)> 0) begin insert into @table select substring(@input,1,1) select @input = RIGHT(@input,Len(@input)-1) end select * from @table GO

  | 字符 |  |:--- |  | 磷 |  | 电子|  | 吨 |  | 电子|  |  r |

 declare @T table ( ID int identity, names varchar(10) ) insert into @T select 'Peter';with cte as ( select ID, left(names, 1) as Data, stuff(names, 1, 1, '') as remains from @T where len(names) > 0 union all select ID, left(remains, 1) as Data, stuff(remains, 1, 1, '') as remains from cte where len(remains) > 0 ) select ID, Data from cte order by ID

 身份证 | 数据 -: |:--- 1 |  1 |  1 |  t 1 |  1 |  r

db<> 在这里摆弄