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

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                  Oracle Database SQL Sample Questions (Q159-Q164):

                  NEW QUESTION # 159
                  View the exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTS and TIMES tables.

                  The PROD_ID column is the foreign key in the SALES table, which references the PRODUCTS table.
                  Similarly, the CUST_ID and TIME_ID columns are also foreign keys in the SALES table referencing the CUSTOMERS and TIMES tables, respectively.
                  Evaluate the following CREATE TABLE command:
                  CREATE TABLE new_sales (prod_id, cust_id, order_date DEFAULT SYSDATE)
                  AS
                  SELECT prod_id, cust_id, time_id
                  FROM sales;
                  Which statement is true regarding the above command?

                  Answer: B


                  NEW QUESTION # 160
                  Which statements are true regarding primary and foreign key constraints and the effect they can have on table data?

                  Answer: D,E,G

                  Explanation:
                  Regarding primary and foreign key constraints:
                  * A. A table can have only one primary key but multiple foreign keys. This is true. A table is constrained to have only one primary key, which can consist of multiple columns, but can have several foreign keys referencing primary keys in other tables.
                  * C. Primary key and foreign key constraints can be defined at both the column and table level.
                  True. Constraints can be defined inline with the column definition or separately at the end of the table definition.
                  * E. It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted. This is also true if the foreign key is defined with the ON DELETE CASCADE option.
                  Options B, D, F, and G are incorrect:
                  * B is incorrect because if a parent row is deleted, the child rows cannot remain without violating the integrity unless the foreign key is defined with ON DELETE SET NULL or similar behavior.
                  * D is incorrect because both primary and foreign key constraints can be defined at both levels.
                  * F is incorrect as the names of the foreign key columns do not need to match the primary key column names.
                  * G is incorrect as a table can have multiple foreign keys.


                  NEW QUESTION # 161
                  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 # 162
                  Which two queries only return CUBE?

                  Answer: B,D


                  NEW QUESTION # 163
                  Which two statements execute successfully?

                  Answer: D,E

                  Explanation:
                  A: This statement is correct. It uses the TO_DATE function with a proper date string, format mask, and NLS_DATE_LANGUAGE setting.
                  B: This statement will not execute successfully because the syntax of the TO_CHAR function is incorrect. The date string should be a DATE data type when used with TO_CHAR, and the format mask and NLS parameter are incorrectly specified.
                  C: This statement will not execute successfully because it is redundant to use TO_CHAR and then immediately convert it back to a date with TO_DATE without specifying a proper format mask.
                  D: This statement is correct. It converts a string to a DATE using TO_DATE and then back to a string with TO_CHAR, without specifying a format which defaults to the session's NLS_DATE_FORMAT.
                  E: This statement will not execute successfully because TO_CHAR is used incorrectly; the first argument must be of DATE data type when you're using a date format mask.
                  Reference for the TO_DATE and TO_CHAR functions and their proper usage can be found in the Oracle Database SQL Language Reference 12c documentation.


                  NEW QUESTION # 164
                  ......

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