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Q21. - (Topic 2)
The EMPLOYEES table has these columns:
LAST NAMEVARCHAR2(35) SALARYNUMBER(8,2) HIRE_DATEDATE
Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement:
ALTER TABLE EMPLOYEES MODIFY (SALARY DEFAULT 5000);
What is true about your ALTER statement?
A. Column definitions cannot be altered to add DEFAULT values.
B. A change to the DEFAULT value affects only subsequent insertions to the table.
C. Column definitions cannot be altered at add DEFAULT values for columns with a NUMBER data type.
D. All the rows that have a NULL value for the SALARY column will be updated with the value 5000.
A change to the DEFAULT value affects only subsequent insertions to the table. Existing
rows will not be affected.
A:Column definitions can be altered to add DEFAULT values.
C:Column definitions can be altered to add DEFAULT values. It works for columns with a
NUMBER data type also.
D:A change to the DEFAULT value affects only subsequent insertions to the table. Existing rows will not be affected.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 219-224 Chapter 5: Creating Oracle Database Objects
Q22. - (Topic 1)
Which statement is true regarding the COALESCE function?
A. It can have a maximum of five expressions in a list.
B. It returns the highest NOT NULL value in the list for all rows.
C. It requires that all expressions in the list must be of the same data type.
D. It requires that at least one of the expressions in the list must have a NOT NULL value.
The COALESCE Function The COALESCE function returns the first nonnull value from its parameter list. If all its parameters are null, then null is returned. The COALESCE function takes two mandatory parameters and any number of optional parameters. The syntax is COALESCE(expr1, expr2,…,exprn), where expr1 is returned if it is not null, else expr2 if it is not null, and so on. COALESCE is a general form of the NVL function, as the following two equations illustrate: COALESCE(expr1,expr2) = NVL(expr1,expr2) COALESCE(expr1,expr2,expr3) = NVL(expr1,NVL(expr2,expr3)) The data type COALESCE returns if a not null value is found is the same as that of the first not null parameter. To avoid an “ORA-00932: inconsistent data types” error, all not null parameters must have data types compatible with the first not null parameter.
Q23. - (Topic 1)
Which statement is true regarding the UNION operator?
A. The number of columns selected in all SELECT statements need to be the same
B. Names of all columns must be identical across all SELECT statements
C. By default, the output is not sorted
D. NULL values are not ignored during duplicate checking
The SQL UNION query allows you to combine the result sets of two or more SQL SELECT statements. It removes duplicate rows between the various SELECT statements. Each SQL SELECT statement within the UNION query must have the same number of fields in the result sets with similar data types.
Q24. - (Topic 1)
View the Exhibit and examine the structure of the CUSTOMERS table. Exhibit:
you issue the following SQL statement on the CUSTOMERS table to display the customers who are in the same country as customers with the last name 'king' and whose credit limit is less than the maximum credit limit in countries that have customers with the last name 'king'.
Which statement is true regarding the outcome of the above query?
A. It produces an error and the < operator should be replaced by < ANY to get the required output
B. It produces an error and the IN operator should be replaced by = in the WHERE clause of the main query to get the required output
C. It executes and shows the required result
D. It produces an error and the < operator should be replaced by < ALL to get the required output
Q25. - (Topic 1)
Where can sub queries be used? (Choose all that apply)
A. field names in the SELECT statement
B. the FROM clause in the SELECT statement
C. the HAVING clause in the SELECT statement
D. the GROUP BY clause in the SELECT statement
E. the WHERE clause in only the SELECT statement
F. the WHERE clause in SELECT as well as all DML statements
SUBQUERIES can be used in the SELECT list and in the FROM, WHERE, and HAVING
clauses of a query.
A subquery can have any of the usual clauses for selection and projection. The following
are required clauses:
A SELECT list
A FROM clause
The following are optional clauses: WHERE GROUP BY HAVING
The subquery (or subqueries) within a statement must be executed before the parent query that calls it, in order that the results of the subquery can be passed to the parent.
Q26. - (Topic 2)
The STUDENT_GRADES table has these columns:
The registrar requested a report listing the students' grade point averages (GPA) sorted from highest grade point average to lowest.
Which statement produces a report that displays the student ID and GPA in the sorted order requested by the registrar?
A. SELECT student_id, gpa FROM student_grades ORDER BY gpa ASC;
B. SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa ASC;
C. SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa;
D. SELECT student_id, gpa FROM student_grades ORDER BY gpa;
E. SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa DESC;
F. SELECT student_id, gpa FROM student_grades ORDER BY gpa DESC;
sorted by highest to lowest is DESCENDING order
Incorrect Answer: Aresult in ascending order Bwrong syntax with SORT keyword Cwrong syntax with SORT keyword Ddefault value for ORDER by is in ascending order Ewrong syntax with SORT keyword
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 2-22
Q27. - (Topic 2)
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:
SQL>SELECT p.prod_name, i.item_cnt FROM (SELECT prod_id, COUNT(*) item_cnt FROM sales GROUP BY prod_id) i RIGHT OUTER JOIN products p
ON i.prod_id = p.prod_id;
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.
Q28. - (Topic 1)
You work as a database administrator at ABC.com. You study the exhibit carefully. Exhibit:
Evaluate the following query: Exhibit:
The above query produces an error on execution. What is the reason for the error?
A. An alias cannot be used in an expression
B. The alias MIDPOINT should be enclosed within double quotation marks for the CUST_CREDIT_LIMIT/2 expression
C. The MIDPOINT +100 expression gives an error because CUST_CREDIT_LIMIT contains NULL values
D. The alias NAME should not be enclosed within double quotation marks
Q29. - (Topic 1)
Which two are true about aggregate functions? (Choose two.)
A. You can use aggregate functions in any clause of a SELECT statement.
B. You can use aggregate functions only in the column list of the select clause and in the WHERE clause of a SELECT statement.
C. You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.
D. You can pass column names, expressions, constants, or functions as parameter to an aggregate function.
E. You can use aggregate functions on a table, only by grouping the whole table as one single group.
F. You cannot group the rows of a table by more than one column while using aggregate functions.
Q30. - (Topic 1)
Which three tasks can be performed using SQL functions built into Oracle Database? (Choose three.)
A. Combining more than two columns or expressions into a single column in the output
B. Displaying a date in a nondefault format
C. Substituting a character string in a text expression with a specified string
D. Finding the number of characters in an expression