在SQL Server中将Varchar转换为Int Data类型
Hello iam使用sqlserver 2008.
Iam将table1与studentid列作为int。另一个表table12与studentntid列为id.Now我必须将数据从table1移动到table2.Before我需要检查table1中的数据是否为整数。如果它是整数，我需要允许它到table2。
我试过isnumeric（studentid ），它接受浮动也像10.0
我试过转换（studentid，int），抛出错误：无法从varchar转换为int。
感谢您的帮助
Hello iam using sqlserver 2008.
Iam having table1 with studentid column as int.And another table table12 with same studentid column as id.Now i have to move the data from table1 to table2.Before dat i need to check whether the data in table1 is integer or not.If it is integer,i need to allow it to table2.
I have tried isnumeric(studentid),it is accepting float also like 10.0
I tried with convert(studentid,int),throwing error :cannot convert from varchar to int.
Thanks for any help
这个问题反映了这些日子初学者最大的谬误之一：工作趋势用字符串表示数据而不是数据本身。如果需要在某些列中包含整数值，请使用一些数字，整数数据类型，而不是varchar。例如，请参阅：
http://technet.microsoft.com/en -us / magazine / dd424925.aspx [ ^ ]。-SA
This question reflects one of the biggest fallacies of the beginners these days: a trend to work with strings representing data instead of data itself. If you need to have integer values in some columns, use some numeric, integer data types, notvarchar. See, for example:
http://technet.microsoft.com/en-us/magazine/dd424925.aspx[^].—SA