1z0-071 Prüfung - 1z0-071 Probesfragen

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Oracle 1z0-071 Exam Syllabus Topics:

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

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1z0-071 Studienmaterialien: Oracle Database SQL & 1z0-071 Zertifizierungstraining

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Oracle Database SQL 1z0-071 Prüfungsfragen mit Lösungen (Q169-Q174):

169. Frage
n the customers table, the CUST_CITY column contains the value 'Paris' for the CUST_FIRST_NAME 'Abigail'.
Evaluate the following query:

What would be the outcome?

  • A. Abigail IS
  • B. Abigail PA
  • C. Abigail Pa
  • D. An error message

Antwort: C


170. Frage
You execute the following commands:

For which substitution variables are you prompted for the input?

  • A. Both the substitution variables 'hiredate' and 'mgr_id\
  • B. None, because no input required
  • C. Only 'mgr_id'
  • D. Only 'hiredate'

Antwort: A


171. Frage
Which three statements are true about a self join?

  • A. The on clause can be used.
  • B. It can be an outer join.
  • C. It must be an equijoin.
  • D. The on clause must be used.
  • E. The query must use two different aliases for the table.
  • F. It must be an inner join.

Antwort: A,B,E

Begründung:
C). True, when performing a self join, aliases are used to differentiate the same table in different contexts within the same query. This helps in comparing different rows within the same table as if they were in two separate tables.D. True, the ON clause can be used in self joins to specify the conditions on which the join is based. This is a standard method for specifying join conditions in SQL.F. True, a self join can be an outer join, allowing for the inclusion of rows that do not have a matching row in the same table according to the join condition. This enhances the flexibility of data analysis and reporting.
References:
* Oracle documentation on joins: Oracle Database SQL Language Reference
* Details on self joins and outer joins: Oracle Joins Tutorial


172. Frage
View the exhibit and examine the structure in ORDERSand ORDER_ITEMStables.

You need to create a view that displays the ORDER_ID, ORDER_DATE, and the total number of items in each order.
Which CREATEVIEWstatement would create the views successfully?

  • A. CREATE OR REPLACE VIEW ord_vu
    AS SELECT o.order_id, o.order_date, COUNT (i.line_item_id)
    " NO OF ITEMS"
    FROM orders o JOIN order_items i
    ON (o.order_id = i.order_id)
    GROUP BY o.order_id, o.order_date;
  • B. CREATE OR REPLACE VIEW ord_vu
    AS SELECT o.order_id, o.order_date, COUNT (i.line_item_id) ||
    " NO OF ITEMS"
    FROM orders o JOIN order_items i
    ON (o.order_id = i.order_id)
    GROUP BY o.order_id, o.order_date
    WHITH CHECK OPTION;
  • C. CREATE OR REPLACE VIEW ord_vu (order_id, order_date)
    AS SELECT o.order_id, o.order_date, COUNT (i.line_item_id)
    " NO OF ITEMS"
    FROM orders o JOIN order_items i
    ON (o.order_id = i.order_id)
    GROUP BY o.order_id, o.order_date;
  • D. CREATE OR REPLACE VIEW ord_vu
    AS SELECT o.order_id, o.order_date, COUNT (i.line_item_id)
    FROM orders o JOIN order_items i
    ON (o.order_id = i.order_id)
    GROUP BY o.order_id, o.order_date;

Antwort: A


173. Frage
Examine the description of the EMPLOYEES table:

The session time zone is the same as the database server
Which two statements will list only the employees who have been working with the company for more than five years?

  • A. SELECT employee_ name FROM employees WHERE (SYSDATE - hire_ data) / 365>5
  • B. SELECT employee_ name FROM employees WHERE (SYSTIMESTAMP - hire_ data) / 365>
  • C. There are typos in this option (CUNACV_DATE should be CURRENT_DATE and hire_data should be hire_date). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.
  • D. SELECT employee_ name FROM employees WHERE (CUARENT_ DATE - hire_ data / 365>5
  • E. SELECT employee_ name FROM employees WHERE (SYSNAYW - hire_ data / 12> 3
  • F. SELECT employee_ name FROM employees WHERE (CUNACV_ DATE - hire_ data / 12> 3
  • G. SELECT employee_ name FROM employees WHERE (SYSNAYW - hire_ data / 12> 3

Antwort: A

Begründung:
To calculate the length of employment, you would compare the current date to the HIRE_DATE and calculate the difference in years.
A : This is the correct answer. The expression calculates the number of days between the current date (SYSDATE) and the HIRE_DATE, then divides by 365 to convert it to years, and checks if it is greater than 5.
B : SYSTIMESTAMP includes a time component including fractional seconds and time zone information, making this comparison incorrect.
C : There are typos in this option (CUARENT_DATE should be CURRENT_DATE and hire_data should be hire_date). Even with the correct function and column names, CURRENT_DATE returns the current date in the session time zone, not in years.
D : There are typos in this option (SYSNAYW should be SYSDATE). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.
E : This is a repetition of option D with the same issues.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Date Functions"


174. Frage
......

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