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Oracle 1z1-071 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Retrieving Data Using SQL SELECT Statement	20%	- Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage
Topic 2: Aggregating Data Using Group Functions	10%	- GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions
Topic 3: Using SET Operators		- UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations
Topic 4: Working with Time Zones and Date/Time Data		- Time zone conversion functions - TIMESTAMP, INTERVAL data types
Topic 5: Managing Indexes, Synonyms and Sequences		- Create and use sequences - Create and maintain indexes - Create and use synonyms
Topic 6: Relational Database Concepts	10%	- Relationship between database and SQL - ERD and SQL statement mapping - Theoretical and physical aspects of relational databases
Topic 7: Displaying Data from Multiple Tables	15%	- Equijoins and non-equijoins - Self-joins and outer joins - Cartesian products
Topic 8: Managing Views		- Updatable and read-only views - Create, modify and drop views
Topic 9: Managing Tables and Constraints		- Data types, creating/altering/dropping tables - Temporary and external tables - Constraints: primary key, foreign key, unique, check, not null
Topic 10: Controlling User Access		- System and object privileges - Roles, granting and revoking privileges
Topic 11: Conversion Functions and Conditional Expressions	10%	- Implicit and explicit data type conversion - NVL, NULLIF, COALESCE and CASE expressions - TO_CHAR, TO_NUMBER, TO_DATE functions
Topic 12: Using Single-Row Functions to Customize Output	20%	- Character, number, and date functions - Nested functions usage
Topic 13: Using Data Dictionary Views		- Retrieve metadata and object information
Topic 14: Manipulating Data and Managing Transactions		- INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts - Transaction control: COMMIT, ROLLBACK, SAVEPOINT
Topic 15: Restricting and Sorting Data	15%	- Substitution variables, DEFINE and VERIFY commands - WHERE clause and filtering conditions - ORDER BY clause and sorting rules - Operator precedence
Topic 16: Using Subqueries to Solve Queries		- Single-row and multi-row subqueries - Correlated subqueries for update/delete

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Oracle Database SQL Sample Questions (Q376-Q381):

NEW QUESTION # 376
Examine the description of the SALES1 table:

SALES2 is a table with the same description as SALES1,
Some sales data is duplicated In both tables.
You want to display the rows from the SALES1 table which are not present in the SALIES2 table.
Which set operator generates the required output?

A. INTERSECT
B. SUBTRACT
C. UNION ALL
D. MINUS
E. UNION

Answer: D

NEW QUESTION # 377
View the exhibit and examine the structure of the EMPLOYEES table.
You want to display all employees and their managers having 100 as the MANAGER_ID.
You want the output in two columns: the first column would have the LAST_NAME of the managers and the second column would have LAST_NAME of the employees.
Which SQL statement would you execute?

A. SELECT m.last_name "Manager", e.last_name "Employee"FROM employees m JOIN employees eON m.employee_id = e.manager_idWHERE m.manager_id = 100;
B. SELECT m.last_name "Manager", e.last_name "Employee"FROM employees m JOIN employees eWHERE m.employee_id = e.manager_id and AND e.manager_id = 100
C. SELECT m.last_name "Manager", e.last_name "Employee"FROM employees m JOIN employees eON e.employee_id = m.manager_idWHERE m.manager_id = 100;
D. SELECT m.last_name "Manager", e.last_name "Employee"FROM employees m JOIN employees eON m.employee_id = e.manager_idWHERE e.manager_id = 100;

Answer: D

NEW QUESTION # 378
Which three statements are true about GLOBAL TEMPORARY TABLES?

A. A TRUNCATE command issued in a session causes all rows In a GLOBAL TEMPORARY TABLE for the issuing session to be deleted.
B. A GLOBAL TEMPORARY TABLE's definition is available to multiple sessions.
C. Any GLOBAL TEMPORARY TABLE rows existing at session termination will be deleted.
D. A DELETE command on a GLOBAL TEMPORARY TABLE cannot be rolled back.
E. GLOBAL TEMPORARY TABLE rows inserted by a session are available to any other session whose user has been granted select on the table.
F. GLOBAL TEMPORARY TABLE space allocation occurs at session start.

Answer: A,B,C

Explanation:
Global temporary tables (GTTs) in Oracle have unique properties related to session-based visibility and data persistence:
B . A TRUNCATE command issued in a session causes all rows in a GLOBAL TEMPORARY TABLE for the issuing session to be deleted: True, TRUNCATE is session-specific for GTTs and will remove all rows inserted by the session that issues the TRUNCATE command.
D . A GLOBAL TEMPORARY TABLE's definition is available to multiple sessions: The structure of a GTT is persistent and shared across sessions, but the data within is session-specific.
E . Any GLOBAL TEMPORARY TABLE rows existing at session termination will be deleted: The data in GTTs is private for the session, and when the session ends, the data is deleted automatically.
Reference:
Oracle Database Concepts and SQL Language Reference 12c, especially the sections on temporary tables.

NEW QUESTION # 379
Examine this data in the EMPLOYERS table

Which statement will execute successfully?

A. SELECT dept_id, INSTR (last_name,'A'), SUM (salary) FROM employees GROUP BY dept_id
B. SELECT dept_id, MAX (Last_name), SUM (salary) FROM employees GROUP BY dept_id
C. SELECT dept_id, LENGTH (last_name), SUM (salary) FROM employees GROUP BY dept_id
D. SELECT dept_id, STDDEV (last_name), SUM (salary) FROM employees GROUP BY dept_id

Answer: B

Explanation:
In SQL, the GROUP BY clause is used in conjunction with aggregate functions to group the result-set by one or more columns.
A). This statement will execute successfully. MAX() is an aggregate function that can be used to return the highest value of the selected column, and SUM() is an aggregate function used to sum the values. Both are valid in the SELECT statement with a GROUP BY clause grouping the results by dept_id.
B). This statement will not execute successfully when used with GROUP BY because LENGTH(last_name) is not an aggregate function and it doesn't appear in the GROUP BY clause. All selected columns that are not under an aggregate function must be included in the GROUP BY clause.
C). This statement will not execute successfully because STDDEV() is an aggregate function that calculates the standard deviation of a set of numbers, and it can only be used on numeric data types. last_name is not a numeric column.
D). This statement will not execute successfully for the same reason as B: INSTR(last_name, 'A') is not an aggregate function and must appear in the GROUP BY clause if it's in the SELECT clause.

NEW QUESTION # 380
You are designing the structure of a table in which two columns have the specifications:
COMPONENT_ID- must be able to contain a maximum of 12 alphanumeric characters and uniquely identify the row EXECUTION_DATETIME- contains Century, Year, Month, Day, Hour, Minute, Second to the maximum precision and is used for calculations and comparisons between components.
Which two options define the data types that satisfy these requirements most efficiently?

A. The COMPONENT_IDmust be of ROWID data type.
B. The EXECUTION_DATETIME must be of DATE data type.
C. The EXECUTION_DATETIME must be of TIMESTAMP data type.
D. The COMPONENT_IDmust be of VARCHAR2 data type.
E. The EXECUTION_DATETIME must be of INTERVAL DAY TO SECOND data type.
F. The COMPONENT_IDcolumn must be of CHAR data type.

Answer: B,F

NEW QUESTION # 381
......

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