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Q31. Evaluate the following SQL commands: 

The command to create a table fails. Identify the two reasons for the SQL statement failure? 

A. You cannot use SYSDATE in the condition of a check constraint. 

B. You cannot use the BETWEEN clause in the condition of a check constraint. 

C. You cannot use the NEXTVAL sequence value as a default value for a column. 

D. You cannot use ORD_NO and ITEM_NO columns as a composite primary key because ORD_NO is also the foreign key. 

Answer: A,C 


CHECK Constraint The CHECK constraint defines a condition that each row must satisfy. The condition can use the same constructs as the query conditions, with the following exceptions: References to the CURRVAL, NEXTVAL, LEVEL, and ROWNUM pseudocolumns Calls to SYSDATE, UID, USER, and USERENV functions Queries that refer to other values in other rows A single column can have multiple CHECK constraints that refer to the column in its definition. There is no limit to the number of CHECK constraints that you can define on a column. CHECK constraints can be defined at the column level or table level. CREATE TABLE employees (... Salary NUMBER(8, 2) CONSTRAINT emp_salary_min CHECK (salary > 0), 

Q32. View the Exhibit and examine the structure of the SALES table. 

The following query is written to retrieve all those product IDs from the SALES table that have more than 55000 sold and have been ordered more than 10 times. 

Which statement is true regarding this SQL statement? 

A. It executes successfully and generates the required result. 

B. It produces an error because count(*) should be specified in the SELECT clause also. 

C. It produces an error because count{*) should be only in the HAVING clause and not in the WHERE clause. 

D. It executes successfully but produces no result because COUNT (prod_id) should be used instead of COUNT (*). 



Restricting Group Results with the HAVING Clause 

You use the HAVING clause to specify the groups that are to be displayed, thus further 

restricting the groups on the basis of aggregate information. 

In the syntax, group_condition restricts the groups of rows returned to those groups for 

which the specified condition is true. 

The Oracle server performs the following steps when you use the HAVING clause: 

1. Rows are grouped. 

2. The group function is applied to the group. 

3. The groups that match the criteria in the HAVING clause are displayed. 

The HAVING clause can precede the GROUP BY clause, but it is recommended that you 

place the GROUP BY clause first because it is more logical. Groups are formed and group 

functions are calculated before the HAVING clause is applied to the groups in the SELECT 


Note: The WHERE clause restricts rows, whereas the HAVING clause restricts groups. 

Q33. View the Exhibit and examine the structure of the CUSTOMERS table. 

You have been asked to produce a report on the customers table showing the customers details sorted in descending order of the city and in the descending order of their income level in each city. 

Which query would accomplish this task? 

A. Option A 

B. Option B 

C. Option C D. Option D 


Q34. View the Exhibit and examine the structure of the customers table. 

Using the customers table, you need to generate a report that shows the average credit limit for customers in Washington and NEW YORK. 

Which SQL statement would produce the required result? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 



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

You need to generate a report of all promos from the promotions table based on the following conditions: 

1. The promo name should not begin with 'T' or 'N'. 

2. The promo should cost more than $20000. 

3. The promo should have ended after 1st January 2001. 

Which where clause would give the required result? 

Answer: WHERE promo_name NOT LIKE ‘T%’ AND promo_name NOT LIKE ‘N%’ AND promo_cost > 20000 AND promo_end_date > ‘1-JAN-01' 

Q36. You need to display the first names of all customers from the customers table that contain the character 'e' and have the character 'a' in the second last position. 

Which query would give the required output? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 



The SUBSTR(string, start position, number of characters) function accepts three parameters and returns a string consisting of the number of characters extracted from the source string, beginning at the specified start position: 

substr('', 12, 6) = domain 

The position at which the first character of the returned string begins. 

When position is 0 (zero), then it is treated as 1. 

When position is positive, then the function counts from the beginning of string to find the first character. 

When position is negative, then the function counts backward from the end of string. substring_length 

The length of the returned string. SUBSTR calculates lengths using characters as defined by the input character set. SUBSTRB uses bytes instead of characters. SUBSTRC uses 

Unicode complete characters. 

SUBSTR2 uses UCS2 code points. SUBSTR4 uses UCS4 code points. 

When you do not specify a value for this argument, then the function 

The INSTR(source string, search item, [start position], [nth occurrence of search item]) function returns a number that represents the position in the source string, beginning from the given start position, where the nth occurrence of the search item begins: 

instr('', '.', 1, 2) = 18 

Q37. Examine the structure of the products table: 

You want to display the names of the products that have the highest total value for UNIT_PRICE * QTY_IN_HAND. 

Which SQL statement gives the required output? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 


Q38. Evaluate the following query: 

SQL> SELECT TRUNC(ROUND(156.00, -1), -1) 


What would be the outcome? 

A. 16 

B. 100 

C. 160 

D. 200 

E. 150 



Function Purpose ROUND(column|expression, n) Rounds the column, expression, or value to n decimal places or, if n is omitted, no decimal places (If n is negative, numbers to the left of decimal point are rounded.) TRUNC(column|expression, n) Truncates the column, expression, or value to n decimal places or, if n is omitted, n defaults to zero 

Q39. You execute the following commands: 

For which substitution variables are you prompted for the input? 

A. None, because no input required 

B. Both the substitution variables 'hiredate' and 'mgr_id\ 

C. Only 'hiredate' 

D. Only 'mgr_id' 


Q40. YOU need to display the date ll-oct-2007 in words as ‘Eleventh of October, Two Thousand Seven'. 

Which SQL statement would give the required result? 

A. Option A 

B. Option B 

C. Option C 

D. Option D