Copy existing column DDL when editing table schema to rearrange columns for a table or to avoid having to re-create an existing column.
Before you can copy a column, be sure that the data server containing the tables is running, and you created and established a connection to the data server. Open the table or tables in the Table Schema Editor. For example, to copy the DDL for a column in one table and paste the column into another table, open both the source and target tables.