Vertical Partitions

Vertical partitioning consists in segmenting a table into multiple tables each containing a subset of columns and the same number of rows as the partitioned table. The partition tables share the same primary key.

1. Select Tools > Denormalization > Vertical Partitioning, or right-click a table in the diagram and select Vertical Partitioning to open the Vertical Partitioning Wizard.
2. Select the table to partition, specify whether you want to keep the original table after partitioning, and then click Next.
3. Create as many partition tables as necessary using the Insert and Add a Row tools (specifying an appropriate name for each, which must be unique in the model), and then click Next.
4. Drag columns from under the original table in the Available columns pane, to the appropriate partition table in the Columns distribution pane, (or select source and target tables and use the Add and Remove buttons), and then click Next.
5. Specify a name and code for the transformation object that will be created to preserve information about the partitioning, and then click Finish to create a table for each partition, taking the name of the partition. All references to the original table are created on each partition table.

   In this example, the table Customer, is divided into two tables, each of which details one type of information about the customer:

   Before	After

   Note: Vertical partitionings created in a PDM generated from another model are preserved when applying changes from the original model. The columns absent from each partition table in the target PDM are shown but not selected in the Merge dialog (see Core Features Guide > Modeling with PowerDesigner > Comparing and Merging Models). Any changes in the source model are proposed, where appropriate, to each of the partition tables, and you should deselect the change for those partitions to which you do not want to apply it.