Database consolidation Code Challenges & Tips

1. Write a SQL query to combine data from two tables, `orders` and `customers`, to display the total amount spent by each customer with their names.

2. Create a stored procedure that takes a `start_date` and `end_date` as parameters and returns a list of all products sold during that period along with their total sales.

3. Write a SQL query to find the duplicate records in a table `employees` based on the `email` column and return the count of each duplicate email.

4. Write a SQL script to merge two tables, `table_A` and `table_B`, which have similar structures, into a new table `table_C` without duplicates.

5. Create a view that consolidates information from three different tables: `sales`, `products`, and `stores`, showing total sales per store along with product names.

6. Write a SQL query to extract the top 10 products sold based on quantity from the `sales` table, including the product name and total quantity sold.

7. Write a recursive SQL query to find all the hierarchical relationships in an `employees` table with a `manager_id` referencing the `employee_id`.

8. Create a trigger that automatically updates a `last_updated` timestamp in the `inventory` table whenever a record in the table is modified.

9. Write a SQL query to summarize and consolidate employee data where departments have changed, maintaining the latest salary information per employee.

10. Write a PL/SQL block that consolidates order data from multiple regions and inserts the summarized data into a `regional_sales` table.