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Q11. View the Exhibit and examine the data in the PROMO_NAME and PROMO_END_DATE columns of the promotions table, and the required output format.
Which two queries give the correct result? A. Option A
B. Option B
C. Option C
D. Option D
Answer: C,D
Q12. In which three situations does a transaction complete?
A. When a DELETE statement is executed
B. When a ROLLBACK command is executed
C. When a PL/SQL anonymous block is executed
D. When a data definition language (DDL) statement is executed
E. When a TRUNCATE statement is executed after the pending transaction
Answer: B,D,E
Q13. Examine the structure of the employees table:
There is a parent/child relationship between EMPLOYEE_ID and MANAGER_ID.
You want to display the name, joining date, and manager for all the employees. Newly hired employees are yet to be assigned a department or a manager. For them, 'No Manager1 should be displayed in the manager column.
Which SQL query gets the required output?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: D
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Q14. Which two statements are true regarding constraints?
A. A table can have only one primary key and one foreign key.
B. A table can have only one primary key but multiple foreign keys.
C. Only the primary key can be defined at the column and table levels.
D. The foreign key and parent table primary key must have the same name.
E. Both primary key and foreign key constraints can be defined at both column and table levels.
Answer: B,E
Q15. Evaluate the following SQL statement:
Which statement is true regarding the outcome of the above query?
A. It executes successfully and displays rows in the descending order of PROMO_CATEGORY.
B. It produces an error because positional notation cannot be used in the order by clause with set operators.
C. It executes successfully but ignores the order by clause because it is not located at the end of the compound statement.
D. It produces an error because the order by clause should appear only at the end of a compound query-that is, with the last select statement.
Answer: D
Q16. 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.
Q17. Which three tasks can be performed using SQL functions built into Oracle Database?
A. Displaying a date in a nondefault format
B. Finding the number of characters in an expression
C. Substituting a character string in a text expression with a specified string
D. Combining more than two columns or expressions into a single column in the output
Answer: A,B,C
Q18. 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: D
Q19. 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: A
Q20. Examine the data in the ORD_ITEMS table:
Evaluate the following query:
Which statement is true regarding the outcome of the above query?
A. It gives an error because the having clause should be specified after the group by clause.
B. It gives an error because all the aggregate functions used in the having clause must be specified in the select list.
C. It displays the item nos with their average quantity where the average quantity is more than double the minimum quantity of that item in the table.
D. It displays the item nos with their average quantity where the average quantity is more than double the overall minimum quantity of all the items in the table.
Answer: C