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Q11. 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.
Q12. View the Exhibit for the structure of the student and faculty tables.
You need to display the faculty name followed by the number of students handled by the faculty at the base location.
Examine the following two SQL statements: Which statement is true regarding the outcome?
A. Only statement 1 executes successfully and gives the required result.
B. Only statement 2 executes successfully and gives the required result.
C. Both statements 1 and 2 execute successfully and give different results.
D. Both statements 1 and 2 execute successfully and give the same required result.
Q13. You issued the following command:
SQL> DROP TABLE employees;
Which three statements are true?
A. All uncommitted transactions are committed.
B. All indexes and constraints defined on the table being dropped are also dropped.
C. Sequences used in the employees table become invalid.
D. The space used by the employees table is reclaimed immediately.
E. The employees table can be recovered using the rollback command.
F. The employees table is moved to the recycle bin.
Q14. 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
Q15. View the Exhibits and examine the structures of the products, sales, and customers tables.
You need to generate a report that gives details of the customer's last name, name of the product, and the quantity sold for a customers in 'Tokyo'.
Which two queries give the required result?
A. Option A
B. Option B
C. Option C
D. Option D
Q16. 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.
Q17. Using the customers table, you need to generate a report that shows 50% of each credit amount in each income level. The report should NOT show any repeated credit amounts in each income level.
Which query would give the required result?
A. Option A
B. Option B
C. Option C
D. Option D
Explanation: Duplicate Rows Unless you indicate otherwise, SQL displays the results of a query without eliminating the duplicate rows.
To eliminate duplicate rows in the result, include the DISTINCT keyword in the SELECT clause immediately after the SELECT keyword.
You can specify multiple columns after the DISTINCT qualifier. The DISTINCT qualifier affects all the selected columns, and the result is every distinct combination of the columns.
Q18. 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.
Q19. 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.
Q20. Which two statements are true regarding single row functions?
A. MOD: returns the quotient of a division B. TRUNC: can be used with number and date values
C. CONCAT: can be used to combine any number of values
D. SYSDATE: returns the database server current date and time
E. INSTR: can be used to find only the first occurrence of a character in a string
F. TRIM: can be used to remove all the occurrences of a character from a string
ROUND: Rounds value to a specified decimal TRUNC: Truncates value to a specified decimal MOD: Returns remainder of division SYSDATE is a date function that returns the current database server date and time.
Date-Manipulation Functions Date functions operate on Oracle dates. All date functions return a value of the DATE data type except MONTHS_BETWEEN, which returns a numeric value. MONTHS_BETWEEN(date1, date2): Finds the number of months between date1 and date2. The result can be positive or negative. If date1 is later than date2, the result is positive; if date1 is earlier than date2, the result is negative. The noninteger part of the result represents a portion of the month. ADD_MONTHS(date, n): Adds n number of calendar months to date. The value of n must be an integer and can be negative. NEXT_DAY(date, 'char'): Finds the date of the next specified day of the week ('char') following date. The value of char may be a number representing a day or a character string. LAST_DAY(date): Finds the date of the last day of the month that contains date The above list is a subset of the available date functions. ROUND and TRUNC number functions can also be used to manipulate the date values as shown below: ROUND(date[, 'fmt']): Returns date rounded to the unit that is specified by the format model fmt. If the format model fmt is omitted, date is rounded to the nearest day. TRUNC(date[, 'fmt']): Returns date with the time portion of the day truncated to the unit that is specified by the format model fmt. If the format model fmt is omitted, date is truncated to the nearest day.
The CONCAT Function The CONCAT function joins two character literals, columns, or expressions to yield one larger character expression. Numeric and date literals are implicitly cast as characters when they occur as parameters to the CONCAT function. Numeric or date expressions are evaluated before being converted to strings ready to be concatenated. The CONCAT function takes two parameters. Its syntax is CONCAT(s1, s2), where s1 and s2 represent string literals, character column values, or expressions resulting in character values.
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('http://www.domain.com', '.', 1, 2) = 18
The TRIM function literally trims off leading or trailing (or both) character strings from a
given source string:
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