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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q299-Q304):

NEW QUESTION # 299
In the PROMOTIONS table, the PROMO_ BEGIN_DATE column is of data type and the default date format is DD-MON-RR Which two statements are true about expressions using PROMO_ BEGIN_DATE in a query?

A. PROMO_ BEGIN_DATE - SYSDATE will return an error
B. PROMO_ BEGIN_DATE - SYSDATE will return a number
C. TODATE(PROMO BEGIN_DATE *5) will return a date
D. TONUMBER (PROMO BEGIN_DATE) - 5 will return a number
E. PROMO_ BEGIN_DATE - 5 will return a date

Answer: B,E

Explanation:
In Oracle SQL, when you subtract a number from a date, the result is a date. When you subtract one date from another, the result is the number of days between the two dates.
* B: PROMO_BEGIN_DATE - 5 will subtract 5 days from the PROMO_BEGIN_DATE, resulting in a new date that is 5 days earlier than PROMO_BEGIN_DATE.
* C: PROMO_BEGIN_DATE - SYSDATE will return the number of days between the PROMO_BEGIN_DATE and the current date (SYSDATE).
The incorrect options are:
* A: TONUMBER(PROMO_BEGIN_DATE) - 5 will not return a number because
PROMO_BEGIN_DATE is a date, and TONUMBER is not a valid function to convert dates to numbers in Oracle.
* D: PROMO_BEGIN_DATE - SYSDATE will not return an error; it will return the number of days between the two dates as explained above.
* E: TODATE(PROMO_BEGIN_DATE * 5) will not return a date because PROMO_BEGIN_DATE
* 5 is not a valid operation in Oracle SQL as you cannot multiply a date by a number, and TODATE is not a valid function. The correct function name is TO_DATE.
References:
* Oracle Documentation on Date Arithmetic: Database SQL Language Reference - Datetime Functions

NEW QUESTION # 300
Examine this data in the EMPLOYERS table:

Which statement will execute successfully?

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

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.
Reference:
Oracle Documentation on GROUP BY: https://docs.oracle.com/database/121/SQLRF/statements_10002.htm#SQLRF01702 Oracle Documentation on Aggregate Functions: https://docs.oracle.com/database/121/SQLRF/functions004.htm#SQLRF51148

NEW QUESTION # 301
Examine these statements executed in a single Oracle session:

Which three statements are true?

A. The code for fountain penis 3.
B. The code for penis 1.
C. There is no row containing fountain pen.
D. There is no row containing pen.
E. There is no row containing pencil.
F. The code for penis 10.

Answer: A,B,E

NEW QUESTION # 302
Which two statements are true about Data Manipulation Language (DML) statements?

A. A DELETE FROM..... statement can remove multiple rows based on multiple conditions on a table.
B. An UPDATE... SET... statement can modify multiple rows based on multiple conditions on a table.
C. A DELETE FROM..... statement can remove rows based on only a single condition on a table.
D. An INSERT INTO...VALUES.. statement can add multiple rows per execution to a table.
E. An INSERT INTO... VALUES..... statement can add a single row based on multiple conditions on a table.
F. An UPDATE....SET.... statement can modify multiple rows based on only a single condition on a table.

Answer: A,B

Explanation:
Explanation
References:
http://www.techonthenet.com/sql/and_or.php

NEW QUESTION # 303
View the exhibit and examine the structures of the EMPLOYEESand DEPARTMENTStables.

You want to update EMPLOYEEStable as follows:
* Update only those employees who work in Boston or Seattle (locations 2900 and 2700).
* Set department_idfor these employees to the department_idcorresponding to London (location_id
2100).
* Set the employees' salary in location_id2100 to 1.1 times the average salary of their department.
* Set the employees' commission in location_id2100 to 1.5 times the average commission of their department.
You issue the following command:

What is outcome?

A. It executes successfully and gives the desired update
B. It generates an error because a subquery cannot have a join condition in a UPDATEstatement.
C. It generates an error because multiple columns (SALARY, COMMISSION)cannot be specified together in an UPDATEstatement.
D. It executes successfully but does not give the desired update

Answer: D

NEW QUESTION # 304
......

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