sql - How to prevent duplication in view when item is child of an element and also parent of itself -

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have mapping table consist of data

parent_sys_object_id    sys_object_id        18                    38        38                    38

and inside view have 2 condition case statement

when se.sys_object_id = 38 , psom.parent_sys_object_id = 18 when se.sys_object_id = 38 , psom.parent_sys_object_id = 38

however happen 1 case not other. meaning 1 case have data, other case have null.

how should fix this?

thanks bunch!


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