heirarchy data

hai guys...i'm kk...(forgive me on my grammatic error)

just now i learn 'bout database...it is quite interesting topic...we learn where our data are provided and how it can travel from 1 place to another.

but now, i want to focus on hierarchy database. 

this type of database consist of parent and child.

notice that, child only allowed to have one parent compare to parents which can have many child.

for a moment, i link it to our real life. commonly every child have one parents. so it easy to make me remember about this kind of parent-child thing that occur in technology case.

 

 for me, this type of database are more composed. we can see the fluency of data move from top to bottom.