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NEW QUESTION # 198
View the Exhibit and examine the structure of the SALES and PRODUCTS tables. (Choose two.)
In the SALES table, PROD_ID is the foreign key referencing PROD_ID in the PRODUCTS table. You must list each product ID and the number of times it has been sold.
Examine this query which is missing a JOIN operator:
SQL > SELECT p.prod_id, count(s.prod_id)
FROM products p ______________ sales s
ON p.prod_id = s.prod_id
GROUP BY p.prod_id;
Which two JOIN operations can be used to obtain the required output?
Answer: C,D
NEW QUESTION # 199
Which three statements are true about multiple row subqueries?
Answer: B,C,D
Explanation:
Multiple row subqueries are subqueries that are used where a subquery is allowed, but they can return more than one row. This means they can be used with operators that allow multiple values like IN, ANY, ALL, etc.
* Option A: They can contain HAVING clauses. This is true. A multiple row subquery can use aggregate functions and, therefore, can include a HAVING clause to filter the results of these aggregates. A HAVING clause is used in a similar way to a WHERE clause, except that it is used to filter rows after an aggregation is performed.
* Option D: They can return multiple columns. This is true. A multiple row subquery can indeed return more than one column, which can be used in the outer query, depending on the context, such as in the column comparison subqueries.
* Option E: They can contain GROUP BY clauses. This is true. Since multiple row subqueries can include aggregate functions, they can also include a GROUP BY clause to specify the grouping of data on which to apply the aggregate functions.
Regarding the incorrect options:
* Option B: Two or more values are always returned from the subquery. This is false. Multiple row subqueries have the potential to return multiple rows, but they are not required to do so. They could return zero, one, or multiple rows depending on the data and the specific query.
* Option C: They cannot contain subquery. This is false. Multiple row subqueries can contain other subqueries within them, which are known as nested subqueries.
For further reading and verification of these points, one can refer to the Oracle Database SQL Language Reference 12c, specifically the sections on subquery syntax and semantics, which discuss the use of HAVING
, GROUP BY, and the ability of subqueries to return multiple rows or columns.
NEW QUESTION # 200
Viev the Exhibit and examine the structure of the PRODUCT INFORMATION and INVENTORIEStables.
You have a requirement from the supplies department to give a list containing PRODUCT _ID,SUPPLIER ID, and QUANTITY_ON HAND for all the products where in QUANTITY ON HAND is lessthan five.
Which two SQL statements can accomplish the task? (Choose two)
Answer: A,B
Explanation:
B: This query correctly joins the two tables on PRODUCT_ID and filters rows where QUANTITY_ON_HAND is less than five. However, the syntax presented here might be incorrect due to improper placement of the condition within the ON clause; it should be in a WHERE clause.
D: This query correctly joins the two tables on PRODUCT_ID and applies the condition in a WHERE clause, which is the proper way to filter rows after performing the join.
Incorrect options:
A: The syntax uses NATURAL JOIN and AND incorrectly; also, conditions should be in a WHERE clause, not combined with the JOIN clause.
C: Similar to A, this option incorrectly places a condition directly in the JOIN clause without using a WHERE clause.
Explanation:
Given the requirement to list PRODUCT_ID, SUPPLIER_ID, and QUANTITY_ON_HAND for products with QUANTITY_ON_HAND less than five:
NEW QUESTION # 201
Examine the description of the CUSTONERS table:
CUSTNO is the PRIMARY KEY.
You must determine if any customers' details have been entered more than once using a different CUSTNO, by listing all duplicate names.
Which two methods can you use to get the required result?
Answer: B,D
Explanation:
To find duplicate customer details entered under different CUSTNO values, one would typically use methods that compare records within the same table:
* C. Subquery: A subquery can be used to compare customer details in the CUSTOMERS table and identify duplicates. This subquery can look for matches in the customer details while having different CUSTNO.
* E. Self Join: A self join can also be used for this purpose. This involves joining the CUSTOMERS table to itself on the columns containing customer details to identify rows that have the same information but different CUSTNO.
References:
* Oracle Database SQL Language Reference 12c, particularly the sections on self joins and subqueries, as these can be utilized to find duplicate rows based on specified criteria.
NEW QUESTION # 202
Choose two
Examine the description of the PRODUCT DETALS table:
Answer: A,D
Explanation:
A . PRODUCT_ID can be assigned the PRIMARY KEY constraint.
In Oracle Database 12c, a PRIMARY KEY constraint is a combination of a NOT NULL constraint and a unique constraint. It ensures that the data contained in a column, or a group of columns, is unique among all the rows in the table and not null. Given the PRODUCT_ID is marked as NOT NULL, it is a candidate for being a primary key because we can assume that it is intended to uniquely identify each product in the table.
Reference:
B . EXPIRY_DATE cannot be used in arithmetic expressions. (Incorrect)
This statement is not necessarily true. Dates in Oracle can be used in arithmetic expressions, typically to add or subtract days from a date.
C . EXPIRY_DATE contains the SYSDATE by default if no date is assigned to it. (Incorrect) Unless explicitly specified, a date column does not default to SYSDATE. A default value must be set using the DEFAULT clause during the table creation or altered later.
D . PRODUCT_PRICE can be used in an arithmetic expression even if it has no value stored in it.
This is correct. In Oracle, if a numeric column like PRODUCT_PRICE has a NULL value (meaning no value stored in it), it can still be used in an arithmetic expression. In such expressions, NULL is typically treated as a zero, but the result of any arithmetic with NULL is also NULL.
E . PRODUCT_PRICE contains the value zero by default if no value is assigned to it. (Incorrect) Unless a default value is explicitly specified during the table creation or altered later, a numeric column like PRODUCT_PRICE does not automatically have a default value of zero.
F . PRODUCT_NAME cannot contain duplicate values. (Incorrect)
There is no constraint indicated that would prevent PRODUCT_NAME from containing duplicate values. Without a UNIQUE or PRIMARY KEY constraint, a column can contain duplicates.
The correct answers are A and D. PRODUCT_ID can be the primary key because it's specified as NOT NULL, thus it can uniquely identify each row in the table. PRODUCT_PRICE can be used in an arithmetic expression with the understanding that if it's NULL, the result of the expression would be NULL as well.
NEW QUESTION # 203
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