Oracle 1z0-071 Dumps

C: True. A SQL statement may include multiple single row subqueries in different parts of the statement, such as in the SELECT list, WHERE clause, or HAVING clause. Each subquery must independently satisfy the requirement of returning a single row to avoid runtime errors.

D: True. Single row subqueries can be used in the HAVING clause. This allows for filtering groups based on conditions evaluated against individual or aggregated values returned by the subquery. The subquery must return a single value to be valid in this context.

E: True. Single row subqueries are often placed on the right side of the comparison operator in a SQL condition. This positioning is typical because the left side often references a column or an expression related to the main query, while the subquery on the right side dynamically provides a value for comparison.

The requirements specify that the data type must support date arithmetic, store a specific period (up to 10 years in terms of days), and be used for day-level calculations. The appropriate data type is:

• A: Incorrect. TIMESTAMP WITH TIMEZONE stores date and time with time zone information, which is not specifically needed for arithmetic or interval storage.
• B: Incorrect. TIMESTAMP stores date and time without considering time zone or providing interval arithmetic functionality.
• C: Incorrect. TIMESTAMP WITH LOCAL TIMEZONE adjusts the time zone but does not inherently support interval arithmetic or storage.
• D: Incorrect. INTERVAL YEAR TO MONTH is used for storing periods in terms of years and months, not suitable for daily calculations.
• E: Correct. INTERVAL DAY TO SECOND allows storage of periods in terms of days, hours, minutes, and seconds, meeting all the given requirements for precision and functionality in date arithmetic related to daily calculations.

The TO_CHAR function is used to convert a number to a string format in Oracle SQL. In this format mask '$9,999', the dollar sign is a literal, and the 9 placeholders represent a digit in the output. The comma is a digit group separator.

A. This statement is incorrect because the format model does not have enough digit placeholders to display the full number 1023.99; it would round it to $1,023 not $1,024. B. This statement is correct. Given the format '$9,999', the number 1023.99 will be formatted as $1,023 because the format rounds the number to no decimal places. C. This is incorrect because the format '$9,999' cannot display the number 10235.99; it exceeds the format's capacity. D. This is incorrect for the same reason as C, and the format would not change the thousands to hundreds. E. This statement is correct. If the number exceeds the maximum length of the format mask, which is 4 digits in this case, Oracle SQL displays a series of hash marks (#) instead of the number.

These formatting rules are described in the Oracle Database SQL Language Reference, which covers the TO_CHAR function and its number formatting capabilities.