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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q211-Q216):

NEW QUESTION # 211
In which three situations does a new transaction always start?

A. When issuing a DML statement after a DML statement filed in the same session.
B. When issuing the first Data Manipulation Language (OML) statement after a COMMIT or ROLLBACK statement was issued in the same session
C. When issuing a TRUNCATE statement after a SELECT statement was issued in the same session
D. When issuing a SELECT FOR UPDATE statement after a CREATE TABLE AS SELECT statement was issued in the same session
E. When issuing a CREATE TABLE statement after a SELECT statement was issued in the same session
F. When issuing a CREATE INDEX statement after a CREATE TABLE statement completed unsuccessfully in the same session

Answer: B,D,F

NEW QUESTION # 212
Examine the structure of the CUSTOMERS table: (Choose two.)

CUSTNO is the PRIMARY KEY.
You must determine if any customers' details have been entered more than once using a different CUSTNO, by listing all duplicate names.
Which two methods can you use to get the required result?

A. Subquery
B. Left outer-join with self-join
C. Self-join
D. Right outer-join with self-join
E. Full outer-join with self-join

Answer: A,C

NEW QUESTION # 213
View the Exhibit and examine the description for the PRODUCTS and SALES table.

PROD_IDis a primary key in the PRODUCTStable and foreign key in the SALEStable with ON DELETE CASCADEoption. The SALEStable contains data for the last three years. You want to remove all the rows from the PRODUCTStable for which no sale was done for the last three years.
Which is the valid DELETEstatement?

A. DELETE
FROM products
WHERE prod_id IN (SELECT prod_id
FROM sales
WHERE time_id >= SYSDATE - 3*365 );
B. DELETE
FROM products
WHERE prod_id = (SELECT prod_id
FROM sales
WHERE SYSDATE >= time_id - 3*365 );
C. DELETE
FROM products
WHERE prod_id = (SELECT prod_id
FROM sales
WHERE time_id - 3*365 = SYSDATE );
D. DELETE
FROM products
WHERE prod_id IN (SELECT prod_id
FROM sales
WHERE SYSDATE - 3*365 >= time_id);

Answer: D

NEW QUESTION # 214
Which two are true about using constraints?

A. A table can have only one PRIMARY KEY but may have multiple FOREIGN KEY constraints.
B. PRIMARY KEY and FOREIGNY constraints can be specified at the column and at the table level
C. A table can have only one PRIMARY KEY and one FOREIGN KEY constraint.
D. A table can have multiple PRIMARY KEY and multiple FOREIGN KEY constraints.
E. NOT NULL can be specified at the column and at the table level.
F. A FOREIGN KEY column in a child table and the referenced PRIMARY KEY column in the parenttable must have the same names.

Answer: A,B

Explanation:
In Oracle Database 12c, it is important to understand the behavior and properties of constraints.
A). This statement is false. A FOREIGN KEY column in a child table does not need to have the same name as the referenced PRIMARY KEY column in the parent table. What is required is that the data type is the same and that the values in the FOREIGN KEY column correspond to values in the PRIMARY KEY column of the parent table.
B). This statement is false. A table cannot have multiple PRIMARY KEY constraints. By definition, a PRIMARY KEY is a unique identifier for a row in a table, and there can only be one such identifier.
C). This statement is false for the same reasons as B; a table can have only one PRIMARY KEY. However, it can have multiple FOREIGN KEY constraints that reference PRIMARY KEYS in other tables.
D). This is true. PRIMARY KEY and FOREIGN KEY constraints can indeed be specified at the column level with the column definition or at the table level with the ALTER TABLE statement.
E). This is true. A table can have only one PRIMARY KEY constraint because it defines a unique row identifier. However, it can have multiple FOREIGN KEY constraints referencing keys in other tables, allowing for complex relational structures.
F). This statement is false. NOT NULL constraints are always defined at the column level, as they apply to individual columns. They cannot be specified at the table level.
References:
* Oracle Documentation on Constraints:
https://docs.oracle.com/database/121/SQLRF/clauses002.htm#SQLRF52271
* Oracle Documentation on NOT NULL Constraints:
https://docs.oracle.com/database/121/SQLRF/clauses002.htm#SQLRF52162

NEW QUESTION # 215
View the Exhibit and examine the structure of the ORDER_ITEMStable.

Examine the following SQL statement:
SELECT order_id, product_id, unit_price
FROM order_items
WHERE unit_price
(SELECT MAX(unit_price)
FROM order_items
GROUP BY order_id);
You want to display the PRODUCT_ID of the product that has the highest UNIT_PRICE per ORDER_ID.What correction should be made in the above SQL statement to achieve this?

A. Remove the GROUP BY clause from the subquery and place it in the main query
B. Replace = with the >ALL operator
C. Replace = with the IN operator
D. Replace = with the >ANY operator

Answer: C

NEW QUESTION # 216
......

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