Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Which of the following relational set operator allows duplicate values in a table?
Choose an answer
A
Union ALL
B
Update
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Except
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Union
Which query determines the customers who have ordered the most books from JustLee Books? (refer to the tables in the JustLee Books database.)a. SELECT customer# FROM ordersJOIN orderitems USING(order#)HAVING SUM(quantity) = (SELECTMAX(SUM(quantity)) FROM ordersJOIN orderitems USING(order#)GROUP BY customer#) GROUP BY customer#;b. SELECT customer# FROM ordersJOIN orderitems USING(order#)WHERE SUM(quantity) = (SELECTMAX(SUM(quantity)) FROM orderitemsGROUP BY customer#);c. SELECT customer# FROM ordersWHERE MAX(SUM(quantity)) = (SELECTMAX(SUM(quantity) FROM orderitemsGROUP BY order#);d. SELECT customer# FROM ordersHAVING quantity = (SELECT MAX(SUM(quantity))FROM orderitemsGROUP BY customer#);
Which one of the following SQL select statements will display a list of all vendors that do not yet have names entered in the vendor table?
Question 8 options:
1)
select vend_code, vend_name from vendor where vend_name IS NULL;
2)
select vend_code, vend_name from vendor where vend_name IS NOT NULL;
3)
select vend_code, vend_name from vendor where vend_name = NULL;
4)
select vend_code, vend_name from vendor where vend_name = NOT NULL;
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