在SQL Server中，我们有一个名为Customer的表，其中有一列名为Customerid，数据类型为整数。我们需要获取列标题为Customer id is（表中 customerid 的值）的输出。将如何查询？( )
Select 'Customer id is' + customerid From Customer
Select 'Customer id is' + CAST(customerid AS varchar) From Customer
Select 'Customer id is' + CAST(customerid AS integer) From Customer
都不对
