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Q1. Examine the structure proposed for the transactions table:
Which two statements are true regarding the creation and storage of data in the above table structure?
A. The CUST_STATUS column would give an error.
B. The TRANS_VALIDITY column would give an error.
C. The CUST_STATUS column would store exactly one character.
D. The CUST_CREDIT_LIMIT column would not be able to store decimal values.
E. The TRANS_VALIDITY column would have a maximum size of one character.
F. The TRANS_DATE column would be able to store day, month, century, year, hour, minutes, seconds, and fractions of seconds
Answer: B,C
Explanation:
VARCHAR2(size)Variable-length character data (A maximum size must be specified:
minimum size is 1; maximum size is 4, 000.)
CHAR [(size)] Fixed-length character data of length size bytes (Default and minimum size
is 1; maximum size is 2, 000.)
NUMBER [(p, s)] Number having precision p and scale s (Precision is the total number of
decimal digits and scale is the number of digits to the right of the decimal point; precision
can range from 1 to 38, and scale can range from –84 to 127.)
DATE Date and time values to the nearest second between January 1, 4712 B.C., and
December 31, 9999 A.D.
Q2. 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'
Answer: B
Q3. 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
Answer: A
Q4. Examine the structure and data of the CUST_TRANS table:
Dates are stored in the default date format dd-mon-rr in the CUST_TRANS table. Which three SQL statements would execute successfully?
A. SELECT transdate + '10' FROM cust_trans;
B. SELECT * FROM cust_trans WHERE transdate = '01-01-07'
C. SELECT transamt FROM cust_trans WHERE custno > "11";
D. SELECT * FROM cust_trans WHERE transdate='01-JANUARY-07'
E. SELECT custno + 'A' FROM cust_trans WHERE transamt > 2000;
Answer: A,C,D
Q5. 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: A
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.
Q6. 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
Q7. Which statement is true regarding the UNION operator?
A. By default, the output is not sorted.
B. Null values are not ignored during duplicate checking.
C. Names of all columns must be identical across all select statements.
D. The number of columns selected in all select statements need not be the same.
Answer: D
Explanation:
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.
Q8. 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.
Q9. View the Exhibit and examine the structure of the promotions table.
Evaluate the following SQL statement:
Which statement is true regarding the outcome of the above query?
A. It shows COST_REMARK for all the promos in the table.
B. It produces an error because the SUBQUERY gives an error.
C. It shows COST_REMARK for all the promos in the promo category 'TV'
D. It produces an error because SUBQUERIES cannot be used with the case expression.
Answer: A
Q10. Which three SQL statements would display the value 1890.55 as $1, 890.55?
A. Option A
B. Option B
C. Option C
D. Option D
E. Option E
Answer: A,D,E
