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I want to create a database for myself. The data has complex grouping. I don't know which system to use to create my database. The data is in groups and sub-group forms, it almost has 5-6 layers of subgroups. I tried SQL but such complex sub-groups are not possible in it.

I really need to create the database. Hope for some good advice. enter image description here

This is the type of grouping I want to do and I am searching for a kind of system that can save such data in a way that when I want to filter the data to find something I can get the results.

EG: if I search for high toughness properties of a material then MS and high carbon steel should appear.

Hope this helps.

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    Thanks for updating your question. It is the weekend now, which is typically a quieter time, but while you're waiting for a specific answer, you might like to review answers in the "subtypes" category (click on the tag I added) like this answer for example. – Paul White Aug 22 '15 at 12:42
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    What database are you using? Your scenario doesn't look that complex to me. I don't see why you can't use SQL. Depending upon volume of data and performance required you could do it with a single table. – Sir Swears-a-lot Aug 26 '15 at 4:39
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You can use PostgreSQL's inheritance feature.

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