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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q295-Q300):

NEW QUESTION # 295
Examine the description of the PRODCTS table which contains data:

Which two are true?

A. The EXPIRY DATE column cannot be dropped.
B. The PROD_ ID column data type can be changed to VARCHAR2 (2).
C. The PROD ID column can be renamed.
D. The PROD NAME column cannot have a DEFAULT clause added to it.
E. The EXPIRY DATE column data type can be changed to TIME STAMP.

Answer: C,E

NEW QUESTION # 296
Examine the data in the INVOICES table:

Examine the data in the CURRENCIES table:
CURRENCY_CODE
-------------
JPY
GPB
CAD
EUR
USD
Which query returns the currencies in CURRENCIES that are not present in INVOICES?

A. SELECT * FROM currencies
MINUS
SELECT * FROM invoices;
B. SELECT currency_ code FROM currencies
INTERSECT
SELECT currency_ code FROM invoices;
C. SELECT currency_ code FROM currencies
MINUS
SELECT currency_ code FROM invoices;
D. SELECT * FROM currencies
WHERE NOT EXISTS (
SELECT NULL FROM invoices WHERE currency_ code = currency_ code);

Answer: C

Explanation:
To calculate the length of employment, you would compare the current date to the HIRE_DATE and calculate the difference in years.
A). This is the correct answer. The expression calculates the number of days between the current date (SYSDATE) and the HIRE_DATE, then divides by 365 to convert it to years, and checks if it is greater than 5.
B). SYSTIMESTAMP includes a time component including fractional seconds and time zone information, making this comparison incorrect.
C). There are typos in this option (CUARENT_DATE should be CURRENT_DATE and hire_data should be hire_date). Even with the correct function and column names, CURRENT_DATE returns the current date in the session time zone, not in years.
D). There are typos in this option (SYSNAYW should be SYSDATE). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.
E). This is a repetition of option D with the same issues.
F). There are typos in this option (CUNACV_DATE should be CURRENT_DATE and hire_data should be hire_date). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Date Functions"

NEW QUESTION # 297
Which two statements about INVISIBLE indexes are true?

A. The query optimIzer never considers INVISIBLE Indexes when determining execution plans
B. You can only create one INVISIBLE index on the same column list
C. an INVISIBLE Index consumes no storage
D. All INSERT, UPDATE, and DELETE statements maintain entries in the index
E. You use AlTER INDEX to make an INVISIBLE Index VISIBLE

Answer: D,E

NEW QUESTION # 298
No-user-defined locks are used in your database.
Which three are true about Transaction Control Language (TCL)?

A. COMMITerases all the transaction's savepoints and releases its locks.
B. ROLLBACKwithout the TO SAVEPOINT clause undoes all the transaction's changes but does not erase its savepoints.
C. ROLLBACKwithout the TO SAVEPOINT clause undoes all the transaction's changes but does not release its locks.
D. COMMITends the transaction and makes all its changes permanent.
E. ROLLBACK TO SAVEPOINT undoes the transaction's changes made since the named savepoint and then ends the transaction.
F. ROLLBACKwithout the TO SAVEPOINT clause undoes all the transaction's changes, releases its locks and erases its savepoints.

Answer: A,D,F

Explanation:
Explanation/Reference: https://docs.oracle.com/cd/A58617_01/server.804/a58233/trans.htm
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_9021.htm

NEW QUESTION # 299
Which two queries return the string Hello! we're ready?

A. SELECT 'Hello! We're ready' FROM DUAL;
B. SELECT q'! Hello! We're ready! 'FROM DUAL;
C. SELECT 'Hello! we\ re ready' ESCAPE'N'FROMDUAL:
D. SELECT "Hello! We're ready "FROM |DUAL;
E. SELECT q'[Hello! We're ready]'FROM DUAL;

Answer: B,E

Explanation:
In Oracle SQL, the q quote operator can be used to define string literals that contain single quotes or other special characters without needing to escape them. The queries using the q quote mechanism, like in options A and C, will successfully return the string as it is, including single quotes within the string.
* A: Correct, it uses the q quote operator with the exclamation mark ! as the delimiter, which allows the string to contain single quotes.
* B: Incorrect, double quotes " in Oracle SQL are used for identifiers such as column names, not string literals.
* C: Correct, this also uses the q quote operator, with the square brackets [] as the delimiters.
* D: Incorrect, the backslash \ is not used as an escape character in Oracle SQL string literals, and the ESCAPE keyword is used incorrectly here.
* E: Incorrect, this does not account for the single quote within the string, which would terminate the string literal prematurely, and it lacks the q quote operator or proper escape mechanism.

NEW QUESTION # 300
......

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