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Oracle Database SQL Sample Questions (Q103-Q108):

NEW QUESTION # 103
Which two statements are true regarding the COUNT function? (Choose two.)

A. A SELECT statement using the COUNT function with a DISTINCT keyword cannot have a WHERE clause.
B. COUNT(*) returns the number of rows including duplicate rows and rows containing NULL value in any column.
C. COUNT(DISTINCT inv_amt) returns the number of rows excluding rows containing duplicates and NULLs in the INV_AMT column.
D. It can only be used for NUMBER data types.
E. COUNT(inv_amt) returns the number of rows in a table including rows with NULL in the INV_AMT column.

Answer: B,C

NEW QUESTION # 104
View the Exhibit and examine the structure of the PRODUCTS table. (Choose the best answer.)

You must display the category with the maximum number of items.
You issue this query:
SQL > SELECT COUNT(*), prod_category_id
FROM products
GROUP BY prod_category_id
HAVING COUNT(*) = (SELECT MAX(COUNT(*)) FROM porducts);
What is the result?

A. It generate an error because the subquery does not have a GROUP BY clause.
B. It executes successfully but does not give the correct output.
C. It generates an error because = is not valid and should be replaced by the IN operator.
D. It executes successfully and gives the correct output.

Answer: A

NEW QUESTION # 105
Which two statements are true regarding single row functions? (Choose two.)

A. TRIM : can be used to remove all the occurrences of a character from a string.
B. CONCAT : can be used to combine any number of values.
C. TRUNC : can be used with NUMBER and DATE values.
D. SYSDATE : returns the database server current date and time.
E. MOD : returns the quotient of a division.
F. INSTR : can be used to find only the first occurrence of a character in a string.

Answer: C,D

Explanation:
Explanation

NEW QUESTION # 106
Which statement is true about the INTERSECT operator used in compound queries?

A. It ignores NULLS.
B. Multiple INTERSECT operators are not possible in the same SQL statement.
C. INTERSECT is of lower precedence than UNION or UNION ALL.
D. It processes NULLS in the selected columns.

Answer: D

Explanation:
For the question about the INTERSECT operator in SQL:
* A. It processes NULLS in the selected columns: The INTERSECT operator compares two SELECT statements and returns rows that exist in both queries. It considers NULLs during this process, and NULLs in corresponding columns must match for rows to be considered equal. This means if both selected columns in the intersecting queries have NULLs, those rows will be included in the output.
Incorrect options:
* B: INTERSECT has higher precedence than UNION and UNION ALL, not lower.
* C: It does not ignore NULLs; rather, it processes them, as explained.
* D: Multiple INTERSECT operators are indeed possible in the same SQL statement, allowing for complex compound queries.

NEW QUESTION # 107
Examine this query:
SELECT TRUNC (ROUND(156.00,-2),-1) FROM DUAL; What is the result?

A. 0
B. 1
C. 2
D. 3
E. 4

Answer: D

Explanation:
The query uses two functions: ROUND and TRUNC. The ROUND function will round the number 156.00 to the nearest hundred because of the -2 which specifies the number of decimal places to round to. This will result in 200. Then the TRUNC function truncates this number to the nearest 10, due to the -1 argument, which will give us 200 as the result since truncation does not change the rounded value in this case.
A . 16 (Incorrect)
B . 160 (Incorrect)
C . 150 (Incorrect)
D . 200 (Incorrect)
E . 100 (Incorrect)

NEW QUESTION # 108
......

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