Please support us

Monday, July 23, 2012

Comparison between hierarchical model, network model and relational model

Data models, Data structures, Data manipulation, Data integrity comparison


When we move with the data models such as hierarchical model, network model, relational model we can identify number of difference in terms of data structures, Data manipulation and Data integrity.



Hierarchical model

Network model

Relational model


Data structure

When we go through the structure of

the hierarchical model we can identify that it used a method for storing data in a database that looks like a family tree with one root and a number of branches or subdivisions. That's why we can say that record types are organized in the form of a rooted tree. But in network model we can identify multiple branches emanating from one or more nodes. So some times it is like a like several trees which share branches. In relational model is that of a relation. Relation is a two-dimensional table. So the table can be used to represent some entity information or some relationship between them

Data structure

One to many or one to one relationships

Allowed the network model to support many to many relationships

One to One,
One to many, Many to many relationships

In hierarchical model only one-to-many or one-to-one relationships can be exist. But in network data model makes it possible to map many to many relationships In relational each record can have multiple parents and multiple child records. In effect, it supports many to many relationships

Data structure

Based on parent child relationship

A record can have many parents as well as many children.

Based on relational data structures


In hierarchical model relationship based in terms of parent child. So a child may only have one parent but a parent can have multiple children. But in network data model a record can have many parents as well as many children. Relational data model is based on relational data structures

Data manipulation

Does not provide an independent stand alone query interface

CODASYL (Conference on Data Systems Languages)

Relational databases are what brings many sources into a common query (such as SQL)

In relational database it use powerful operations such as SQL languages or query by example are used to manipulate data stored in the database But in hierarchical data model it does not
provide an independent stand alone query interface while network model uses CODASYL

Data manipulation

retrieve algorithms are complex and asymmetric

Retrieve algorithms are complex and symmetric

Retrieve algorithms are simple and symmetric

In hierarchical data model and network model retrieve algorithms are complex and symmetric But in relational data model retrieve algorithms are simple and symmetric

Data integrity

Cannot insert the information of a child who does not have any parent.

Does not suffer form any insertion anomaly.

Does not suffer from any insert anomaly.

In hierarchical data model we cannot insert the information of a child who does not have any parent. But in network model does not suffer form any insertion anomaly. relational model does not suffer from any insert anomaly

Data integrity

Multiple occurrences of child records which lead to problems of inconsistency during the update operation

Free from update anomalies.

Free form update anomalies

In network model it is free from update anomalies because there is only a single occurrence for each record set.In relational model it also free form update anomalies because it removes the redundancy of data by proper designing through normalization process. But in hierarchical model there are multiple occurrences of child records. which lead to problems of inconsistency during the update operation

Data intergirty

Deletion of parent results in deletion of child records

Free from delete anomalies

Free from delete anomalies

In hierarchical model it is based on parent child relationship and deletion of parent results in deletion of child records .But in network model and in relational model it is free from deletion anomalies. Because information is stored in different tables.


  1. this is the only simple enough discription that i grasped easily

  2. easy nd good discription

  3. thanx...great summary

  4. I was recommended this web site via my cousin. I am no longer certain whether this submit is written by him as no one else realize
    such targeted approximately my problem. You're amazing! Thanks!

    Feel free to visit my blog post :: bmi chart

  5. Someone essentially assist to make critically posts I would state.
    This is the very first time I frequented your website page and so far?
    I amazed with the research you made to create this actual
    put up incredible. Wonderful job!

    My web page - healthy diet plans

  6. I love what you guys tend to be up too. This sort of clever work and reporting!

    Keep up the good works guys I've incorporated you guys to my personal blogroll.

    my web site; Hair style

  7. I all the time used to read paragraph in news papers but now as I
    am a user of web so from now I am using net for posts, thanks to web.

    Feel free to surf to my site; hair brushes :: :

  8. You actually make it seem really easy together with your presentation however I in finding this topic to be really one thing which I believe I would never understand.
    It kind of feels too complex and very extensive for me.
    I am having a look forward on your subsequent put up, I will attempt to get
    the cling of it!

    Feel free to visit my web site - vps hosting

  9. I have read so many posts concerning the blogger lovers however this
    paragraph is in fact a nice post, keep it up.

    Check out my web site - binary trading :: :

  10. Hi there I am so happy I found your web site, I really found you by mistake, while
    I was researching on Bing for something else, Regardless I am here now
    and would just like to say kudos for a remarkable post and a
    all round entertaining blog (I also love the theme/design),
    I don’t have time to browse it all at the moment but
    I have book-marked it and also included your RSS feeds, so when I
    have time I will be back to read more, Please do keep up the fantastic jo.

    Here is my site :: binary option trading

  11. simple and easy,,,yoyo

  12. liked it very much.. & in very simple language :)

  13. simple and easy...we liked it very much....thanks

  14. this is an awesome tutorial very helpful to me

  15. Hi it's me, I am also visiting this site daily, this website is really pleasant and the people are actually sharing good thoughts.

    Here is my website Click here

  16. Thiis is realpy іnteresting, You're a very skilled blogger.
    Ӏ haѵe joined your feed аnd lkok forward tο seeing more ߋff yur
    fantastic post. Αlso, I havе shared ʏour site іn mƴ social networks!

    mу blog post: obtaining private health insurance

  17. I'm gone to say to my little brother, that he should
    also visit this web site on regular basis to take updated from hottest information.

    Also visit my web blog ... okaley glasses

  18. It's very effortless to find out any matter on net as compared to textbooks,
    as I found this paragraph at this site.

    Also visit my blog ... world of warplanes free download

  19. For latest information you have to pay a quick visit web and on internet I found this
    web site as a finest web site for most up-to-date updates.

    Feel free to surf to my web page - goji berry (

  20. What the heck i just read? The earliest point is to consult with a health care provider before making
    use of this supplement. The extract of Garcinia Cambogia
    is offered as supplements and tablets and asking a doctor will provide you a clean know-how
    about the point that will it fit you or not. The product normally fits the
    requirements of all the individuals but exceptions are always there.
    So, it is advisable to make sure that you aren't the one that are
    unable to utilize this solution. Another important problem is regarding
    the dose. You should consult your physician concerning intake and be unique about this authentic
    Garcinia Cambogia.
    WOW.Nice read here. The important step to exactly how the product works is that it is
    actually a dual action diet supplement, meaning that it works being an diet enhancing drug plus a "fat burner".

    This actually shows that it oxidizes your fat cells with the use of anti-oxidants,
    and this leads to extra vitality for your needs - but only if
    you know how taking authentic Garcinia Cambogia in the suitable manner.A lot of diet solutions currently
    available are designed near reving up your fat burning capacity,
    which is not really risk-free for many people - and this is the reason why so many people are
    deciding to order Garcinia Cambogia extract instead.

    Here is my site ... garcinia cambogia methotrexate reviews from users

  21. easily understandable..........really useful

  22. thnx it simple to understand....

  23. hello there and thank you for your information – I've certainly picked
    up something new from right here. I did however expertise some
    technical issues using this website, as I experienced
    to reload the website lots of times previous to I could get it
    to load properly. I had been wondering if your web hosting is OK?
    Not that I am complaining, but sluggish loading instances times will sometimes affect your placement in google and could damage your quality score if advertising and marketing with Adwords.
    Anyway I am adding this RSS to my email and could
    look out for a lot more of your respective
    exciting content. Make sure you update this
    again soon.

    My homepage: Asian Massage; Chumtalk.Com,

  24. Oh my goodness! Incredible article dude! Thanks, However I am going through troubles with your
    RSS. I don't understand the reason why I can't join it.
    Is there anybody else having the same RSS issues? Anyone who knows the answer can you kindly respond?

    Here is my website - bleeding hemorrhoids treatment

    1. kindly tell me the diffence between Hierarical,network,relational,object oriented models -_-?

  25. it usefull thanks.

  26. hello!,I love your writing very much! share we keep inn touch extra approximately your article on AOL?
    I require an expet inn this house to solve my problem.
    Maybe that's you! Looking forward to peer you.

    Look at my homepage ipjone 5 bumper case (

  27. Very good information. Lucky me I ran across your blog by
    accident (stumbleupon). I have saved it for later!

    My page; what is turmeric curcumin

  28. Very good-concise information. thanks.

  29. a fine summary. nicely described.

  30. fine ,nice and very well

  31. This information is really useful.... thnks

  32. This comment has been removed by the author.

  33. Please explain, hierarchical model, network model, relational model which one is best?

    1. Present we are using relational model

  34. Very aptly written . Nice with clarity.

  35. foreign key support on network model are nor?


We need your comments