About cardinality in Jdeveloper

Hi,
As I know, below are the types of relationship between tables.
1. one to one
2. one to many
3. many to many
4. many to one
When creating association, I do not understand the following
1. 0..1 to *
2. 0..1 to 0..1
3. 0..1 to 1
Thanks in advance.
Ivan

Ivan,
0..1 to * = optional one-to-many (1 to * would be mandatory one-to-many)
0..1 to 0..1 = optional one-to-one (optional on both sides)
0..1 to 1 = optional one-to one (optional on one side).
many-to-many is usually implemented in practice by introducing an intersection table that has a one-to-many relationship with each of the two original tables.
In short, the 0..1 means "zero or one" and the * means "many", so you can read 1 to * as "one-to-many" or 0..1 to * as "optional one-to-many" etc
Hope this helps,
John

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