> Nodes of Key List Nodes for key definitions of a specific table. Operations on Main Tree View Select the node of Key List to list existing keys on the content pane. Right-click on the node to add a new key definition. Select the child node Key to edit the definition. You can delete the definition by right-clicking or keying Del on the node. Operations on content pane Select node Key to show the definition of the key. Details are as follow. * KEY Type and Seq.(Sequence) KEY Type is a read-only property, as it's declared only when adding a new key definition. Options of KEY Type are PK(Primary Key), SK(Secondary Key) and FK(Foreign Key). Edit sequence(listing order) of the key definition as needed(PK is compulsory sequenced on the top). * Field List A key can has one or multiple fields. Drag a node of Field onto Field List to add fields to the key definition. You can not add nor delete fields from key definition which has relationship to other key definitions. Delete relationship in order to add/delete key fields. Order of key fields can be changed by dragging row of field on Field List. * Relationship List Relationship is defined by pairing two definitions of key. Drag node of Key onto Relationship List to add a new definition. When pairing keys , key types are compared and the type of relationship is automatically chosen. Pairing rules for relationship type are as follow. - Pairing PK (or SK) and PK (or SK) If number of key fields and data types are corresponding each other, SUBTYPE relationship is given. If the key contains anothier key, FAMILY relationship is given. In the example above, key of Table1 is a part of key of Table2. Therefore, they are FAMILY and Table2 is a child. And Table4 is SUBTYPE of Table3 as keys are equal and existance fo Table4 is conditional(condition is mentioned in the definition of relationship). - Pairing PK (or SK) and FK If number of key fields and data types are corresponding each other, REFER relationship is given. In the example above, as key of Table3 is PK and key of Table2 is FK, they are in REFER relationship and Table2 is a refering and Table3 is a refered.

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