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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q311-Q316):

NEW QUESTION # 311
View the Exhibit and examine the data in the EMPLOYEES table.
Exhibit

You want to generate a report showing the total compensation paid to each employee to date.
You issue the following query:

What is the outcome?

A. It executes successfully but does not give the correct output.
B. It generates an error because the concatenation operator can be used to combine only two items.
C. It generates an error because the alias is not valid.
D. It generates an error because the usage of the ROUND function in the expression is not valid.
E. IT executes successfully and gives the correct output.

Answer: A

NEW QUESTION # 312
Examine the structure proposed for the TRANSACTIONS table:

Which two statements are true regarding the storage of data in the above table structure? (Choose two.)

A. The CUST_STATUS column would allow storage of data up to the maximum VARCHAR2 size of
4,000 characters.
B. The TRANS_DATE column would allow storage of dates only in the dd-mon-yyyy format.
C. The TRANS_VALIDITY column would allow storage of a time interval in days, hours, minutes, and seconds.
D. The CUST_CREDIT_VALUE column would allow storage of positive and negative integers.

Answer: C,D

NEW QUESTION # 313
Which two statements are true about sequences created in a single instance database? (Choose two.)

A. CURRVAL is used to refer to the last sequence number that has been generated
B. The numbers generated by a sequence can be used only for one table
C. When the MAXVALUE limit for a sequence is reached, you can increase the MAXVALUE limit by using the ALTER SEQUENCE statement
D. When a database instance shuts down abnormally, the sequence numbers that have been cached but not used would be available once again when the database instance is restarted
E. DELETE <sequencename> would remove a sequence from the database

Answer: A,C

Explanation:
Gaps in the Sequence
Although sequence generators issue sequential numbers without gaps, this action occurs independent of a commit or rollback. Therefore, if you roll back a statement containing a sequence, the number is lost.
Another event that can cause gaps in the sequence is a system crash. If the sequence caches values in memory, those values are lost if the system crashes. Because sequences are not tied directly to tables, the same sequence can be used for multiple tables.
However, if you do so, each table can contain gaps in the sequential numbers.
Modifying a Sequence
If you reach the MAXVALUE limit for your sequence, no additional values from the sequence are allocated and you will receive an error indicating that the sequence exceeds the MAXVALUE. To continue to use the sequence, you can modify it by using the ALTER SEQUENCE statement To remove a sequence, use the DROP statement:
DROP SEQUENCE dept_deptid_seq;

NEW QUESTION # 314
Using the CUSTOMERS table, you need to generate a report that shows 50% of each credit amount in each income level. The report should NOT show any repeated credit amounts in each income level.
Which query would give the required result?

A. SELECT DISTINCT cust_income_level || ` ' || cust_credit_limit * 0.50 AS "50% Credit Limit" FROM customers.
B. SELECT cust_income_level, DISTINCT cust_credit_limit * 0.50 AS "50% Credit Limit" FROM customers
C. SELECT cust_income_level || ` ' || cust_credit_limit * 0.50 AS "50% Credit Limit" FROM customers.
D. SELECT DISTINCT cust_income_level, DISTINCT cust_credit_limit * 0.50 AS "50% Credit Limit" FROM customers.

Answer: A

NEW QUESTION # 315
The ORDERS table has a primary key constraint on the ORDER_ID column.
The ORDER_ITEMS table has a foreign key constraint on the ORDER_ID column, referencing the primary key of the ORDERS table.
The constraint is defined with ON DELETE CASCADE.
There are rows in the ORDERS table with an ORDER_TOTAL of less than 1000.
Which three DELETE statements execute successfully?

A. DELETE * FROM orders WHERE order_total < 1000;
B. DELETE orders WHERE order_total < 1000;
C. DELETE FROM orders;
D. DELETE order_id FROM orders WHERE order_total < 1000;
E. DELETE FROM orders WHERE order_total < 1000;

Answer: B,D

NEW QUESTION # 316
......

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