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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q435-Q440):

NEW QUESTION # 435
Examine this query which executes successfully:
SELECT job, deptno FROM emp
UNION ALL
SELECT job, deptno FROM jobs_ history;
What will be the result?

A. It will return rows from both SELECT statements including duplicate rows.
B. It will return rows common to both SELECT statements.
C. It will return rows from both SELECT statements after eliminating duplicate rows.
D. It will return rows that are not common to both SELECT statements.

Answer: A

NEW QUESTION # 436
The SYSDATEfunction displays the current Oracle Server date as:
21-MAY-19
You wish to display the date as:
MONDAY, 21 MAY, 2019
Which statement will do this?

A. SELECT TO_CHAR(SYSDATE, 'FMDAY, DD MONTH, YYYY') FROM DUAL;
B. SELECT TO_CHAR(SYSDATE, 'FMDAY, DDTH MONTH, YYYY') FROM DUAL;
C. SELECT TO_DATE(SYSDATE, 'FMDAY, DD MONTH, YYYY') FROM DUAL;
D. SELECT TO_CHAR(SYSDATE, 'FMDD, DAY MONTH, YYYY') FROM DUAL;

Answer: A

Explanation:
SELECT ID, TO_CHAR(Start_Date,'fmDay Month fmDD, YYYY') AS "Start Date" FROM Employee; Reference: http://www.java2s.com/Code/Oracle/Data-Type/ TOCHARDatefmDayMonthfmDDYYYYEmbeddedspacescanberemovedbyplacingthefmprefix.htm

NEW QUESTION # 437
Which three statements are true regarding indexes?

A. An update to a table can result in updates to any or all of the table's indexes.
B. A UNIQUE index can be altered to be non-unique.
C. When a table is dropped and is moved to the RECYCLE BIN, all Indexes built on that table are permanently dropped.
D. A SELECT statement can access one or more indices without accessing any tables.
E. An update to a table can result in no updates to any of the table's indexes.
F. A table belonging to one user can have an index that belongs to a different user,

Answer: A,B,D

Explanation:
Indexes are structures that can improve the retrieval time of data from a database table and have certain characteristics:
* A. A SELECT statement can access one or more indices without accessing any tables: If the index contains all the columns needed for the query, Oracle can retrieve the data from the index alone without accessing the table. This is known as an index-only scan.
* D. A UNIQUE index can be altered to be non-unique: It is possible to alter a unique index to become non-unique by using the ALTER INDEX command.
* F. An update to a table can result in updates to any or all of the table's indexes: If the updated column is part of one or more indexes, those indexes will need to be updated to reflect the change. If the updated column is not part of an index, then no index update is required.
References:
* Oracle Database SQL Language Reference 12c, especially sections on index management and the behavior of DML operations with respect to indexes.

NEW QUESTION # 438
Sales data of a company is stored in two tables, SALES1 and SALES2, with some data being duplicated across the tables. You want to display the results from the SALES1 table, which are not present in the SALES2 table.

Which set operator generates the required output?

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

Answer: D

Explanation:
Explanation
References:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/queries004.htm

NEW QUESTION # 439
What is true about non-equijoin statement performance?

A. The BETWEEN condition always performs less well than using the >= and <= conditions.
B. Table aliases can improve performance.
C. The join syntax used makes no difference to performance.
D. The Oracle join syntax performs better than the SQL:1999 compliant ANSI join syntax.
E. The BETWEEN condition always performs better than using the >= and <= conditions.

Answer: B,C

NEW QUESTION # 440
......

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