The Columns collection is a group of Column objects containing a complete description of all available metadata about source and destination columns. The name, description, data type, precision, scale, nullability, and numeric base are stored for each column or expression used as a source or destination.
| Add Method | Item Method |
| AddColumn Method | New Method |
| Insert Method | Remove Method |
| Count Property | Parent Property |
| Column Object | SourceColumns Property |
| DestinationColumns Property |