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Oracle 1z1-071 Exam Syllabus Topics:

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

>> 1z1-071 Zertifizierung <<

1z1-071 Prüfungsfragen, 1z1-071 Fragen und Antworten, Oracle Database SQL

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Oracle Database SQL 1z1-071 Prüfungsfragen mit Lösungen (Q374-Q379):

374. Frage
Which two are SQL features?

A. providing database transaction control
B. providing graphical capabilities
C. providing variable definition capabilities.
D. providing update capabilities for data in external files
E. processing sets of data

Antwort: A,E

Begründung:
SQL (Structured Query Language) is a domain-specific language used in programming and designed for managing data held in a relational database management system.
A). False. SQL does not have graphical capabilities; it is a textual language for database interaction.
B). False. SQL supports variable definition, but it is not a core feature of the language. Variables are more commonly defined in procedural extensions to SQL, such as PL/SQL in Oracle.
C). True. SQL provides database transaction control through statements like COMMIT, ROLLBACK, and SAVEPOINT.
D). True. SQL is designed for processing sets of data, allowing for operations such as selection, projection, and joins on sets of rows.
E). False. SQL does not provide capabilities to update data in external files. It operates on data within the database.

375. Frage
View the exhibit and examine the structure and data in the invoice table. (Choose two.)

Which two SQL statements would execute successfully?

A. SELECT AVG(inv_date) FROM invoice
B. SELECT MAX(AVG(SYSDATE -inv_date)) FROM invoice
C. SELECT AVG( inv_date -SYSDATE), AVG(inv_amt) FROM invoice
D. SELECT MAX(inv_date), MIN(cust_id) FROM invoice

Antwort: C,D

376. Frage
Sales data of a company is stored in two tables, SALES1and SALES2, with some data being duplicated across the tables. You want to display the results from the SALES1table, which are not present in the SALES2table.
SALES1 table
Name Null Type
------------------ ------------- ----------------
SALES_ID NUMBER
STORE_ID NUMBER
ITEMS_ID NUMBER
QUANTITY NUMBER
SALES_DATE DATE
SALES2 table
Name Null Type
---------------- ------------- -----------------
SALES_ID NUMBER
STORE_ID NUMBER
ITEMS_ID NUMBER
QUANTITY NUMBER
SALES_DATE DATE
Which set operator generates the required output?

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

Antwort: E

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

377. Frage
Evaluate the following ALTER TABLE statement:
ALTER TABLE orders SET UNUSED order_date; Which statement is true?

A. ROLLBACK can be used to get back the ORDER_DATE column in the ORDERS table.
B. The ORDER_DATE column should be empty for the ALTER TABLE command to execute successfully.
C. After executing the ALTER TABLE command, you can add a new column called ORDER_DATE to the ORDERS table.
D. The DESCRIBE command would still display the ORDER_DATE column.

Antwort: C

378. Frage
Which three statements are true about an ORDER BY clause?

A. An ORDER BY clause can perform a binary sort
B. An ORDER BY clause always sorts NULL values last.
C. By default an ORDERBY clause sorts rows in ascending order
D. An ORDER BY clause can perform a linguistic sort
E. An ORDR BY clause will always precede a HAVI NG clause if both are used in the same top-level

Antwort: A,C,D

Begründung:
In Oracle Database 12c, the behavior of the ORDER BY clause is guided by several rules:
Option B: An ORDER BY clause can perform a binary sort.
A binary sort is the default sorting mechanism in Oracle Database, which is based on the binary representation of the data.
Option C: An ORDER BY clause can perform a linguistic sort.
Oracle supports linguistic sorting through the use of the NLS_SORT parameter, which can be set to various linguistic and cultural norms.
Option D: By default, an ORDER BY clause sorts rows in ascending order.
If no ASC or DESC keyword is specified, Oracle will sort the results in ascending order by default.
Options A and E are incorrect:
Option A is not universally true; the position of NULL values in the sort order can be controlled by settings or specific SQL syntax (NULLS FIRST or NULLS LAST).
Option E is incorrect as the HAVING clause filters groups after data has been grouped by the GROUP BY clause and cannot be logically placed before ORDER BY in processing order.

379. Frage
......

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