When should a subquery be nested inside of a HAVING clause?
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- Write a SELECT statement that uses a correlated subquery to return one row per customer, representing the customer's oldest order (the one with the earliest date). Each row should include these five columns: first_name last_name order_id order_date total quantity Include only orders with a total order quantity greater than 2. Subject: MySQLWhat exactly is the purpose of the group by clause?If a subquery is used in the FROM clause of a query, how are the subquery’s results referenced in other clauses of the query?
- Write a SELECT statement that returns three columns using the explicit join syntax: CompanyName From the Customers Table ShipAddress From the Orders Table CompanyName AS Shipping Company From the Shippers Table Sort the result set by Shipping CompanyWhat does the group by clause accomplish?Write a SELECT statement that returns three columns: EmailAddress, OrderID, and the order total for each customer. To do this, you can group the result set by the EmailAddress and OrderID columns. In addition, you must calculate the order total from the columns in the OrderItems table. Write a second SELECT statement that uses the first SELECT statement in its FROM clause. The main query should return two columns: the customer�s email address and the largest order for that customer. To do this, you can group the result set by the EmailAddress column.