Question

我收到标题中描述的错误，我的代码如下所示：

declare
@cols numeric(10,0),
@sql numeric(10,0)

select @cols = isnull(@cols + ', ', '') + '[' + T.AmountPayd + ']' from (select distinct AmountPayd from t1) as T

select @sql = '
    select *
    from t1 as T
        pivot
        (
            sum(T.AmountPayd) for T.Customer in (' + @cols + ')
            ) as P'
exec sp_executesql @sql = @sql

此行发生错误：

select @cols = isnull(@cols + ', ', '') + '[' + T.AmountPayd + ']' from (select distinct AmountPayd from t1) as T

在我的表格中，AmountPayd被声明为数字数据类型。我得到的错误是：

Msg 8114，Level 16，State 5，Line 108转换数据类型时出错 varchar为数字。

Answer 1

您已将@cols声明为数字（10,0），但您正在尝试为其指定文本可能需要将其声明为nvarchar（max）。

P.S。通过连接AmountPayd你想得到一个客户列表？

Answer 2

declare
--@cols numeric(10,0),
--@sql numeric(10,0)
@cols varchar(max),
@sql varchar(max)

--Here you are setting @cols to a concatenated list of the amounts in your table
--The problem is you are trying to concat a decimal or integer into a string without casting it
--This is the same as doing 'A' + 1 and wanting to get A1. You first have to cast it.
--Notice the CAST(T.AmountPayd AS VARCHAR). But cols still needs to be a varchar in your declaration.

select @cols = isnull(@cols + ', ', '') + '[' + CAST(T.AmountPayd AS VARCHAR) + ']' from (select distinct AmountPayd from t1) as T

--Here you are building your dynamic SQL, which is a string which is why @sql must be varchar or nvarchar
select @sql = '
    select *
    from t1 as T
        pivot
        (
            sum(T.AmountPayd) for T.Customer in (' + @cols + ')
            ) as P'
exec sp_executesql @sql = @sql

您几乎已将此示例行复制为行，您只是错过了变量的声明。

http://sqlhints.com/2014/03/18/dynamic-pivot-in-sql-server/

将数据类型varchar转换为数字动态数据透视时出错

2 个答案: