Database mein data ko sirf store karna kafi nahi hota, aksar hamein us data ka hisab-kitab (Calculations) karna padta hai aur unhe alag-alag hisson mein baantna (Grouping) padta hai. Inhe SQL mein Aggregate Functions aur Grouping Clauses kehte hain.
Chaliye inko HTML, PHP backend code, aur SQL syntax ke sath asan Hindi mein samajhte hain.
Maan lijiye hamare paas ek Orders table hai jisme columns hain: id, product_name, category, price, aur order_date.

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