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Q1. Which two statements are true regarding subqueries? 

A. A subquery can retrieve zero or more rows. 

B. Only two subqueries can be placed at one level. 

C. A subquery can be used only in SQL query statements. 

D. A subquery can appear on either side of a comparison operator. 

E. There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement. 

Answer: A,D 

Explanation: 

Using a Subquery to Solve a Problem Suppose you want to write a query to find out who earns a salary greater than Abel’s salary. To solve this problem, you need two queries: one to find how much Abel earns, and a second query to find who earns more than that amount. You can solve this problem by combining the two queries, placing one query inside the other query. The inner query (or subquery) returns a value that is used by the outer query (or main query). Using a subquery is equivalent to performing two sequential queries and using the result of the first query as the search value in the second query. Subquery Syntax A subquery is a SELECT statement that is embedded in the clause of another SELECT statement. You can build powerful statements out of simple ones by using subqueries. They can be very useful when you need to select rows from a table with a condition that depends on the data in the table itself. You can place the subquery in a number of SQL clauses, including the following: WHERE clause HAVING clause FROM clause In the syntax: operator includes a comparison condition such as >, =, or IN Note: Comparison conditions fall into two classes: single-row operators (>, =, >=, <, <>, <=) and multiple-row operators (IN, ANY, ALL, EXISTS). The subquery is often referred to as a nested SELECT, sub-SELECT, or inner SELECT statement. The subquery generally executes first, and its output is used to complete the query condition for the main (or outer) query. Guidelines for Using Subqueries Enclose subqueries in parentheses. Place subqueries on the right side of the comparison condition for readability. (However, the subquery can appear on either side of the comparison operator.) Use single-row operators with single-row subqueries and multiple-row operators with multiple-row subqueries. 

Subqueries can be nested to an unlimited depth in a FROM clause but to “only” 255 levels in a WHERE clause. They can be used in the SELECT list and in the FROM, WHERE, and HAVING clauses of a query. 

Q2. You issue the following command to drop the products table: 

SQL> DROP TABLE products; 

Which three statements are true about the implication of this command? 

A. All data along with the table structure is deleted. 

B. A pending transaction in the session is committed. 

C. All indexes on the table remain but they are invalidated. 

D. All views and synonyms remain but they are invalidated. 

E. All data in the table is deleted but the table structure remains. 

Answer: A,B,D 

Q3. 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:

Q4. Which create table statement is valid? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:

Explanation: 

PRIMARY KEY Constraint A PRIMARY KEY constraint creates a primary key for the table. Only one primary key can be created for each table. The PRIMARY KEY constraint is a column or a set of columns that uniquely identifies each row in a table. This constraint enforces the uniqueness of the column or column combination and ensures that no column that is part of the primary key can contain a null value. Note: Because uniqueness is part of the primary key constraint definition, the Oracle server enforces the uniqueness by implicitly creating a unique index on the primary key column or columns. 

Q5. View the Exhibit and examine the data in the employees table: 

You want to display all the employee names and their corresponding manager names. Evaluate the following query: 

Which join option can be used in the blank in the above query to get the required output? 

A. INNER JOIN 

B. FULL OUTER JOIN 

C. LEFT OUTER JOIN 

D. RIGHT OUTER JOIN 

Answer:

Q6. 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. 

Q7. You want to create a table employees in which the values of columns EMPLOYEES_ID and LOGIN_ID must be unique and not null. Which two SQL statements would create the required table? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

F. Option F 

Answer: D,E 

Q8. View the Exhibits and examine the structures of the products and sales tables. 

Which two SQL statements would give the same output? A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer: A,C 

Q9. You want to display 5 percent of the employees with the highest salaries in the EMPLOYEES table. 

Which query will generate the required result? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:

Q10. You need to list the employees in DEPARTMENT_ID 30 in a single row, ordered by HIRE_DATE. 

Examine the sample output: 

Which query will provide the required output? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:

Reference: http://docs.oracle.com/cd/E11882_01/server.112/e10592/functions089.htm 

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