Product Classification is different categories placed in different tables, or in a table, just mark the classification tag just fine

Product categories are different categories are placed in different tables, or in a table, just mark the classification tag just fine
Technology Daniel, Ask a thing ~

Product categories are different categories placed in different tables, or placed in a table, just mark the classification tag? ~

I do not know whether it is the conventional approach, I did a select with a selected classification, labeled 0,1,2 such classification, and then different categories into different SQL into different tables.
Later found, placed in a table can also, as long as the mark is different, the display can also be divided.

Beginner, caught dead ~ Thank you! ~
------to solve the idea----------------------
Can be placed in a table, classification if there are more than two level of words in addition to have Level1 (level) Lever2 (level two), but also note that the two-level FID (parent id) = A level of ID, and a level of fid=0

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