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Q31. View the Exhibit and examine the structure of the products table. 

Using the products table, you issue the following query to generate the names, current list price, and discounted list price for all those products whose list price falls below $10 after a discount of 25% is applied on it. 

The query generates an error. What is the reason for the error? 

A. The parenthesis should be added to enclose the entire expression. 

B. The double quotation marks should be removed from the column alias. 

C. The column alias should be replaced with the expression in the where clause. 

D. The column alias should be put in uppercase and enclosed within double quotation marks in the where clause. 

Answer:


Q32. View the Exhibit and examine the data in the costs table. 

You need to generate a report that displays the IDs of all products in the costs table whose unit price is at least 25% more than the unit cost. The details should be displayed in the descending order of 25% of the unit cost. You issue the following query: 

Which statement is true regarding the above query? 

A. It executes and produces the required result. 

B. It produces an error because an expression cannot be used in the order by clause. 

C. It produces an error because the DESC option cannot be used with an expression in the order by clause. 

D. It produces an error because the expression in the ORDER by clause should also be specified in the SELECT clause. 

Answer:


Q33. Examine the types and examples of relationships that follow: 

1. One-to-one a) Teacher to students 

2. One-to-many b) Employees to Manager 

3. Many-to-one c) Person to SSN 

4. Many-to-many d) Customers to products 

Which option indicates the correctly matched relationships? 

A. 1-a, 2-b, 3-c, and 4-d 

B. 1-c, 2-d, 3-a, and 4-b 

C. 1-c, 2-a, 3-b, and 4-d 

D. 1-d, 2-b, 3-a, and 4-c 

Answer:


Q34. Which statement is true regarding the default behavior of the order by clause? 

A. In a character sort, the values are case-sensitive. 

B. NULL values are not considered at all by the sort operation. 

C. Only those columns that are specified in the select list can be used in the order by clause. 

D. Numeric values are displayed from the maximum to the minimum value if they have decimal positions. 

Answer:

Explanation: 

Character Strings and Dates 

Character strings and date values are enclosed with single quotation marks. 

Character values are case-sensitive and date values are format-sensitive. 

The default date display format is DD-MON-RR. 


Q35. Evaluate the following SQL statement: 

Which statement is true regarding the above query if one of the values generated by the subquery is null? 

A. It produces an error. 

B. It executes but returns no rows. 

C. It generates output for null as well as the other values produced by the subquery. 

D. It ignores the null value and generates output for the other values produced by the subquery. 

Answer:


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Q36. You want to display 5 percent of the rows from the sales table for products with the lowest AMOUNT_SOLD and also want to include the rows that have the same AMOUNT_SOLD even if this causes the output to exceed 5 percent of the rows. 

Which query will provide the required result? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:


Q37. View the Exhibits and examine products and sales tables. 

You issue the following query to display product name and the number of times the product has been sold: 

What happens when the above statement is executed? 

A. The statement executes successfully and produces the required output. 

B. The statement produces an error because item_cnt cannot be displayed in the outer query. 

C. The statement produces an error because a subquery in the from clause and outer-joins cannot be used together. 

D. The statement produces an error because the group by clause cannot be used in a subquery in the from clause. 

Answer:


Q38. View the Exhibit and examine the structure of the promotions table. 

Evaluate the following SQL statement: 

Which statement is true regarding the outcome of the above query? 

A. It shows COST_REMARK for all the promos in the table. 

B. It produces an error because the SUBQUERY gives an error. 

C. It shows COST_REMARK for all the promos in the promo category 'TV' 

D. It produces an error because SUBQUERIES cannot be used with the case expression. 

Answer:


Q39. Which two statements are true regarding the count function? 

A. The count function can be used only for CHAR, VARCHAR2, and NUMBER data types. 

B. Count (*) returns the number of rows including duplicate rows and rows containing null value in any of the columns. 

C. Count (cust_id) returns the number of rows including rows with duplicate customer IDs and NULL value in the CUST_ID column. 

D. Count (distinct inv_amt) returns the number of rows excluding rows containing duplicates and NULL values in the INV_AMT column. 

E. A select statement using the COUNT function with a DISTINCT keyword cannot have a where clause. 

Answer: B,D 

Explanation: 

Using the COUNT Function 

The COUNT function has three formats: 

COUNT(*) 

COUNT(expr) 

COUNT(DISTINCT expr) 

COUNT(*) returns the number of rows in a table that satisfy the criteria of the SELECT 

statement, including duplicate rows and rows containing null values in any of the columns. 

If a WHERE clause is included in the SELECT statement, COUNT(*) returns the number of rows that satisfy the condition in the WHERE clause. 

In contrast, 

COUNT(expr) returns the number of non-null values that are in the column identified by expr. 

COUNT(DISTINCT expr) returns the number of unique, non-null values that are in the column identified by expr. 


Q40. Examine the structure of the transactions table: 

You want to display the date, time, and transaction amount of transactions that where done before 12 noon. The value zero should be displayed for transactions where the transaction amount has not been entered. 

Which query gives the required result? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer: