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Insert multiple values and then search one


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I have 3 tables.

1)state(s_id, details);

 

2)univer(u_id,details,s_id);

 

3)sub(su-id,daetails,u_id, s_id)

 

Now there is a problem, for ever selection of state and univer there is multiple choice of sub and they can be common in different selections. And how to store these values in databse and can call in a selection menu. so how can i solve it?

Edited by N0name
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