Rename a Table or a Column

Microsoft SQL Server has a very cool function to change the name of table or column or indexes.. sp_rename

To rename a table
EXEC sp_rename 'dbo.Cust' 'Customer'
The above command renames the table Cust to Customer in the dbo schema.

To rename a column
EXEC sp_rename 'dbo.Cust.CustName' 'CustomerName', 'COLUMN'
The above command renames the Column CustName to CustomerName on the table dbo.Cust

You can use the same command to rename an Index as well.
EXEC sp_rename 'dbo.Customer.idx_CustomerId', 'idx_Customer_CustomerId', 'INDEX'

More details about the sp_rename on MSDN Link