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How to avoid Duplicate Records


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My project has repeated subcategoreis (Duplicate Records). i want to avoid(Duplicate Records).



Let us say i have a category called CBSE, ICSE


These CBSE and ICSE same subcategories. i want do avoid that repeated subcategories (Duplicate Records)


CBSE-->6th STD, 8th std-->science, Maths

ICSE-->6th STD, 8th std-->science, Maths


Here u can understand under cbse and icse i have same subcategories .If i have inserted data like this , i will have n numder repeated rows with same subcategories name, i would like to avoid such datas. Basically i would like insert my subcategories only one time and i would like to map both categories to that subcategory. how to handle this problem .please help me in this.


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