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Oracle 1z1-071 Exam Syllabus Topics:

SectionObjectives
Topic 1: Data Manipulation and Schema Objects- DDL operations
  • 1. CREATE, ALTER, DROP tables and constraints
    - DML operations
    • 1. INSERT, UPDATE, DELETE, MERGE
      Topic 2: Relational Database Concepts- Data types and database objects overview
      - Tables, rows, columns, and relational model basics
      Topic 3: SQL Retrieval- Joins and set operations
      • 1. INNER, OUTER, CROSS joins
        • 2. UNION, INTERSECT, MINUS
          - SELECT statements and filtering data
          • 1. WHERE clause and conditions
            • 2. ORDER BY and row limiting
              Topic 4: Subqueries and Advanced SQL- Correlated subqueries and nested queries
              - Single-row and multi-row subqueries
              Topic 5: SQL Functions- Conversion and conditional functions
              • 1. TO_CHAR, TO_NUMBER, CASE expressions
                - Single-row functions
                • 1. Character, numeric, date functions

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                  Oracle Database SQL Sample Questions (Q394-Q399):

                  NEW QUESTION # 394
                  Which three are key components of an Entity Relationship Model?

                  Answer: A,B,F

                  Explanation:
                  Key components of an Entity-Relationship Model (ERM) include:
                  * B. an attribute: Attributes are properties or characteristics of an entity, such as a person's name, date of birth, etc., and are essential in describing the data aspects of an entity in an ER model.
                  * E. a relationship: Relationships describe how entities interact with each other within the database structure, such as a customer placing an order.
                  * F. an entity: Entities are the key components of an ER model, representing objects or things within the domain that have a distinct existence, like 'Customer' or 'Order'.
                  Incorrect options:
                  * A: A table is a database structure used to implement an entity in relational databases, not a component of the ER model itself.
                  * C: While unique identifiers are crucial in database implementation (typically as primary keys), they are a specific attribute type, not a general component of ER models.
                  * D: An activity is not a component of an ER model; activities relate more to process models or behavioral models in systems design.


                  NEW QUESTION # 395
                  Examine the structure of the BOOKS_TRANSACTIONS table:

                  Examine the SQL statement:

                  Which statement is true about the outcome?

                  Answer: B


                  NEW QUESTION # 396
                  View the Exhibit and examine the structure of the EMPLOYEES and JOB_HISTORY tables.

                  Examine this query which must select the employee IDs of all the employees who have held the job SA_MAN at any time during their employment.
                  SELECT EMPLOYEE_ID
                  FROM EMPLOYEES
                  WHERE JOB_ID = 'SA_MAN'
                  -------------------------------------
                  SELECT EMPLOYEE_ID
                  FROM JOB_HISTORY
                  WHERE JOB_ID = 'SA_MAN';
                  Choose two correct SET operators which would cause the query to return the desired result.

                  Answer: A,D


                  NEW QUESTION # 397
                  Examine the data in the EMPLOYEES table:

                  Which statement will compute the total annual compensation for each employee?

                  Answer: B


                  NEW QUESTION # 398
                  Examine this partial statement:
                  SELECT ename, sal,comm FROM emp
                  Now examine this output:

                  WHICH ORDER BY clause will generate the displayed output?

                  Answer: C

                  Explanation:
                  The ORDER BY clause is used in a SELECT statement to sort the returned rows by one or more columns.
                  A . This clause would attempt to order by ename as if it were a numeric column, which is not correct since ename is not numeric.
                  B . This is the correct answer. The NVL function replaces nulls with the specified value, in this case, 0. This clause sorts by comm, with nulls considered as 0 and appearing first, followed by the actual values, and then sorts by ename.
                  C . This clause is incorrect because it would place null values at the end, but in the output, rows with null comm appear at the beginning.
                  D . This clause would sort the comm in descending order with the nulls at the end, which is not consistent with the output shown.
                  Reference:
                  Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ORDER BY Clause" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "NVL Function" Please note that the correct formatting of SQL statements and clauses is crucial for the successful execution of queries.


                  NEW QUESTION # 399
                  ......

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