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Hi, I need some help with my college work, with the database I am designing. # Assuming I want this to happen: # **Main Category:** Level1 Level1 >Level1.1 >Level1.2 >>Level1.2.a >>Level1.2.b >>>Level1.2.b.a >>Level1.2.b.a.a >>>Level1.2.b.b How do I design this? Thank you! 
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In reference to this: http://sqllessons.com/categories.html *Change parentid NULL to 0* Let's say I have 6 levels of subcategories. How do I have chained select dropdown based on the main category which has a 0 value under parentid, then show it's subcategoryLevel1 > SubcategoryLevel2 > and so on. Stops when there … 
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