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Oracle 1z1-071 Exam Syllabus Topics:

Section	Weight	Objectives
Managing Tables and Constraints		- Temporary and external tables - Data types, creating/altering/dropping tables - Constraints: primary key, foreign key, unique, check, not null
Conversion Functions and Conditional Expressions	10%	- Implicit and explicit data type conversion - TO_CHAR, TO_NUMBER, TO_DATE functions - NVL, NULLIF, COALESCE and CASE expressions
Using Single-Row Functions to Customize Output	20%	- Character, number, and date functions - Nested functions usage
Aggregating Data Using Group Functions	10%	- SUM, AVG, COUNT, MAX, MIN functions - GROUP BY and HAVING clauses - Handling NULLs in group functions
Retrieving Data Using SQL SELECT Statement	20%	- SELECT statement syntax and usage - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT
Restricting and Sorting Data	15%	- ORDER BY clause and sorting rules - WHERE clause and filtering conditions - Substitution variables, DEFINE and VERIFY commands - Operator precedence
Manipulating Data and Managing Transactions		- Transaction control: COMMIT, ROLLBACK, SAVEPOINT - Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements
Displaying Data from Multiple Tables	15%	- Cartesian products - Equijoins and non-equijoins - Self-joins and outer joins
Controlling User Access		- System and object privileges - Roles, granting and revoking privileges
Relational Database Concepts	10%	- Relationship between database and SQL - ERD and SQL statement mapping - Theoretical and physical aspects of relational databases
Managing Indexes, Synonyms and Sequences		- Create and use synonyms - Create and maintain indexes - Create and use sequences
Managing Views		- Create, modify and drop views - Updatable and read-only views
Working with Time Zones and Date/Time Data		- Time zone conversion functions - TIMESTAMP, INTERVAL data types
Using Subqueries to Solve Queries		- Correlated subqueries for update/delete - Single-row and multi-row subqueries
Using SET Operators		- Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators
Using Data Dictionary Views		- Retrieve metadata and object information

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Oracle Database SQL Sample Questions (Q390-Q395):

NEW QUESTION # 390
Examine this statement:

What is returned upon execution?

A. 2 rows
B. 1 row
C. 0 rows
D. an error

Answer: B

NEW QUESTION # 391
Examine the description of the EMPLOYEES table:

NLS_DATE_FORMAT is set to DD-MON-YY.
Which query requires explicit data type conversion?

A. SELECT join date FROM employees where join date > *10-02-2018*;
B. SELECT join date + 20 FROM employees;
C. SELECT salary + 120.50 FROM employees;
D. SELECT join date 11.'11 salary FROM employees;
E. SELECT SUBSTR(join date, 1, 2)- 10 FROM employees;

Answer: A

NEW QUESTION # 392
Examine these statements which execute successfully:

Both statements display departments ordered by their average salaries.
Which two are true?

A. Both statements will execute successfully If you add E.AVG_SAL. to the select list.
B. Only the second statement will execute successfully if you add E.AVG_SAL to the select list.
C. Only the first statement will display departments with no employees.
D. Only the second statement will display departments with no employees.
E. Both statements will display departments with no employees.
F. Only the first statement will execute successfully if you add E.AVG_SAL to the select list.

Answer: B,E

NEW QUESTION # 393
You execute this command:
ALTER TABLE employees SET UNUSED (department_id);
Which two are true?

A. A query can display data from the DEPARTMENT_ID column.
B. The storage space occupied by the DEPARTMENT_ID column is released only after a COMMIT is issued.
C. The DEPARTMENT_ID column is set to null for all tows in the table
D. The DEPARTMENT_ID column can be recovered from the recycle bin
E. A new column with the name DEPARTMENT_ID can be added to the EMPLOYEES table.
F. No updates can be made to the data in the DEPARTMENT_ID column.

Answer: E,F

Explanation:
D). True, after setting the DEPARTMENT_ID column to UNUSED, you can add a new column with the name DEPARTMENT_ID to the EMPLOYEES table. The UNUSED clause does not delete the column, it only marks it as no longer being used.E. True, once a column is marked as UNUSED, you cannot make updates to it. It becomes inaccessible for DML operations.
A, B, C, and F are not correct because: A. Once a column is set to UNUSED, it is not available for queries. B.
The storage space is not immediately released after issuing a COMMIT; instead, the actual removal and space reclamation happen when you subsequently issue the DROP UNUSED COLUMNS operation. C. The DEPARTMENT_ID column is not set to null; instead, it's marked as UNUSED, which means it is no longer available for use. F. UNUSED columns are not placed into the recycle bin; they are just marked for deletion, and space can be reclaimed with the DROP UNUSED COLUMNS command.
References:
* Oracle documentation on ALTER TABLE: Oracle Database SQL Language Reference
* Understanding ALTER TABLE SET UNUSED: Oracle Database Administrator's Guide

NEW QUESTION # 394
Which three statements are true about single-row functions?

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

Answer: A,B,D

Explanation:
Single-row functions in SQL return one result per row, and the following statements are true:
A: The data type of the returned value can indeed be different from the data type of the argument provided to the function. For example, the TO_CHAR function can take a numeric input and return a character string.
B: Single-row functions can be nested within each other to any level that is supported by Oracle. This means you can have a function call as an argument to another function, and so on.
E: The argument to a single-row function can be a column name, a variable, a literal, or an expression. This flexibility allows these functions to be very powerful in SQL expressions.
The incorrect options are:
C: Single-row functions do not return a single result row per table; they return a result for each row that is processed.
D: They are not limited to accepting only one argument. Some functions, like NVL, accept multiple arguments.
F: They are not limited to use in the WHERE clause; single-row functions can be used in any part of a SQL statement, including SELECT and ORDER BY clauses.
Reference:
Oracle Documentation on Single-Row Functions: SQL Functions

NEW QUESTION # 395
......

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