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Oracle 1z1-071 certification exam covers a broad range of topics related to SQL programming language, such as data definition language (DDL), data manipulation language (DML), and data control language (DCL). In addition, the exam also covers various topics related to SQL functions, such as single-row functions, group functions, and conversion functions. 1z1-071 Exam also assesses the candidate's knowledge of schema objects, such as tables, views, indexes, and sequences.

Oracle Database SQL Sample Questions (Q184-Q189):

NEW QUESTION # 184
A session's NLS_DATE_FORMAT is set to DD Mon YYYY .
Which two queries return the value 1 Jan 2019?

A. SELECT '2019-01-01' FROM DUAL ; 2019-01-01
B. SELECT TO_ DATE('2019-01-01') FROM DUAL;
C. SELECT to_date(' 2019-01-01 ', 'YYYY -MM-DD' ) FROM DUAL;
D. SELECT TO_CHAR('2019-01-01') FROM DUAL; 2019-01-01
E. SELECT DATE '2019-01-01' FROM DUAL ;

Answer: E

Explanation:
When the NLS_DATE_FORMAT is set to DD Mon YYYY, the database expects the date string to be in the format of day, abbreviated month name, and full year.
B). The query SELECT DATE '2019-01-01' FROM DUAL; correctly returns the value 1 Jan 2019 because the ANSI date literal DATE 'YYYY-MM-DD' is independent of the NLS_DATE_FORMAT parameter.
Option A is incorrect because the TO_DATE function requires the format model to match the string literal, which it does not in this case.
Option C is incorrect because TO_CHAR is used to convert a date to a string, not a string to a date.
Option D is incorrect because without specifying that the string is a date, the result is just a string and not a date value.
Option E is incorrect because TO_DATE without a format model relies on the NLS_DATE_FORMAT to interpret the string, and YYYY-MM-DD does not match DD Mon YYYY.

NEW QUESTION # 185
Which three statements are true about single-row functions? (Choose three.)

A. They can be used only in the WHERE clause of a SELECT statement
B. They return a single result row per table
C. They can be nested to any level
D. The data type returned can be different from the data type of the argument
E. They can accept only one argument
F. The argument can be a column name, variable, literal or an expression

Answer: D,F

Explanation:
Explanation/Reference: https://www.folkstalk.com/2012/01/oracle-single-row-functions-examples.html

NEW QUESTION # 186
You issued this command:
CHOOSE THREE
SQL > DROP TABLE employees;
Which three statements are true?

A. If there is an uncommitted transaction in the session, it is committed.
B. The space used by the EMPLOYEES table is always reclaimed immediately.
C. The EMPLOYEES table can be recovered using the ROLLBACK command.
D. Sequences used in the EMPLOYEES table become invalid.
E. The EMPLOYEES table may be moved to the recycle bin.
F. All indexes and constraints defined on the table being dropped are also dropped.

Answer: A,E,F

NEW QUESTION # 187
View the Exhibit and examine the structure of the PRODUCTS table. Which two tasks require subqueries?

A. Display suppliers whose PR0D_LIST_PRICE is less than 1000.
B. Display the total number of products supplied by supplier 102 which have a product status of obsolete.
C. Display the number of products whose PROD_LIST_PRlCE is more than the average prod_list_price.
D. Display products whose prod_min_PRICE is more than the average PROD_LIST_PRlCE of all products, and whose status is orderable.
E. Display the minimum prod_list_price for each product status.

Answer: C,D

NEW QUESTION # 188
Which two statements are true regarding the UNION and UNION ALL operators? (Choose two.)

A. Duplicates are eliminated automatically by the UNION ALL operator
B. The output is sorted by the UNION ALL operator
C. The names of columns selected in each SELECT statement must be identical
D. NULLS are not ignored during duplicate checking
E. The number of columns selected in each SELECT statement must be identical

Answer: D,E

NEW QUESTION # 189
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