sql-server - 将数据类型 varchar 转换为数字的 SQL 错误

Question

我需要做这个查询：

declare @no as varchar(100)

set @no='11,2,23'

select * from ft (nolock) where fno in (@no)

但一直有这个错误：Error convert data type varchar to numeric

fno 是表中的数字

Answer 1

您不能直接选择数据，in (@no)因为LIKE需要将数据作为表格。请试试：

declare @no nvarchar(max)
set @no='11,2,23'

select * from ft (nolock) where fno in (    
    SELECT 
         Split.a.value('.', 'VARCHAR(100)') AS CVS  
    FROM  
    (
         SELECT
             CAST ('<M>' + REPLACE(@no, ',', '</M><M>') + '</M>' AS XML) AS CVS  
    ) AS A CROSS APPLY CVS.nodes ('/M') AS Split(a))

Answer 2

您可以使用表变量轻松完成您尝试创建的查询，而不仅仅是 varchar 变量：

declare @t table (
        n int
)

insert into @t
values
 (1)
,(2)
,(3)

select
        *
from someTable
where n in (
        select 
            n
    from @t
)