将数据类型varchar转换为数字并溢出时出错

Question

declare @Commission decimal(18,2)
select @Commission=percentage from Commission
declare @qry varchar(Max)

set @qry='select 5 +'+@Commission +''

EXEC(@qry)

Here

The Error converting data type varchar to numeric.

Answer 1

Don't pass values into dynamic SQL as strings. Instead, learn to use sp_executesql :

declare @Commission decimal(18, 2);

select @Commission = percentage
from Commission;

declare @qry varchar(Max);

set @qry='select 5 + @Commission';

exec sp_executesql @qry, 'N@Commission decimal(18, 2)', @Commission=@Commission;

Answer 2

set @qry='select 5 +'+convert(nvarchar(max),@FranchiseeCommission)+''

Answer 3

Try it like this:

SET @qry='select 5 +'+CAST(@FranchiseeCommission AS varchar(30))+''

Since your variable is a decimal, you have to cast it as varchar in order to combine it with your string.

Answer 4

SQL Server's implicit conversion rules makes it attempt to implicitly convert your varchar to decimal . You need to explicitly convert the decimal to varchar :

set @qry='select 5 +'+ CAST(@FranchiseeCommission as varchar(20))

Answer 5

如果2012+，总会有concat()

set @qry=concat('select 5 +',@Commission)