Why primary key is required?
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Can a foreign key be a duplicate?
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SELECT category, type, AVG(price) FROM products GROUP BY category, type ORDER BY 1, 2 If there are three distinct categories in the "products" table, and each one has five different types, how many rows are returned by the query above? 1. 1 row 2. 3 rows 3. 5 rows 4. 8 rows 5. 15 rows
i declare 4 procedure in package specification but in package body i write only 3 procedure. is it complie??//w
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