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Q1. Which three statements are true reading subquenes?A. A Main query can have many subqueries.B. A subquery can have more than one main queryC. The subquery and main query must retrieve date from the same table.D. The subquery and main query can retrieve data from different tables.E. Only one column or expression can be compared between the subquery and main…
Q1. View the Exhibit and examine the ORDERS table.The ORDERS table contains data and all orders have been assigned a customer ID. Which statement would add a NOT NULL constraint to the CUSTOMER_ID column?A. ALTER TABLE ordersADD CONSTRAINT orders_cust_id_nn NOT NULL (customer_id);B. ALTER TABLE ordersMODIFY customer_id CONSTRAINT orders_cust_id_nn NOT NULL;C. ALTER TABLE ordersMODIFY CONSTRAINT orders_cust_id_nn NOT NULL (customer_id);D. ALTER TABLE…
Q1. Which two statements are true regarding the GROUP BY clause in a SQL statement? (Choose two.)A. You can use column alias in the GROUP BY clause.B. Using the WHERE clause after the GROUP BY clause excludes the rows after creating groups.C. The GROUP BY clause is mandatory if you are using an aggregate function in the SELECT clause.D. Using…