1z1-071試験勉強過去問、1z1-071資格関連題

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Oracle 1z1-071 Exam Syllabus Topics:

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

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                  Oracle Database SQL 認定 1z1-071 試験問題 (Q26-Q31):

                  質問 # 26
                  Examine these SQL statements which execute successfully:

                  Which two statements are true after execution?

                  正解：B、C


                  質問 # 27
                  Which three statements are true? (Choose three.)

                  正解：A、D、F

                  解説：
                  Explanation/Reference:
                  References:
                  https://docs.oracle.com/cd/B10501_01/server.920/a96524/c05dicti.htm


                  質問 # 28
                  Examine the command:

                  What does ON DELETE CASCADE imply?

                  正解：D


                  質問 # 29
                  Which two statements are true? (Choose two.)

                  正解：C、E

                  解説：
                  A . The USER SYNONYMS view can provide information about private synonyms: This view contains information about private synonyms that have been created by the user. It lists all synonyms that are accessible to the user in their schema.
                  E . DICTIONARY is a view that contains the names of all the data dictionary views that the user can access: This view lists the names of all data dictionary views available to the user, providing a directory of useful database metadata.
                  Incorrect options:
                  B: The SYSTEM user does not own all base tables of the data dictionary; some are owned by SYS.
                  C: Not all users have access to dynamic performance views prefixed with V$; access is restricted based on privileges.
                  D: The USER_OBJECTS view lists all objects owned by the user, not just tables and views but also other types of schema objects like procedures and functions.


                  質問 # 30
                  The INVOICE table has a QTY_SOLD column of data type NUMBER and an INVOICE_DATE column of data type DATE NLS_DATE_FORMAT is set to DD-MON-RR.
                  Which two are true about data type conversions involving these columns in query expressions?

                  正解：B、D

                  解説：
                  The statements regarding data type conversions and the treatment of literals in SQL expressions involve understanding implicit and explicit data conversions in Oracle SQL.
                  Statement A is true as invoice_date > '01-02-2019' involves an implicit conversion of the string literal to a date type, based on the NLS_DATE_FORMAT setting, assuming the format matches.
                  Statement E is true because, similarly to A, invoice_date = '15-march-2019' involves an implicit conversion where the string is automatically converted to a date type according to the Oracle NLS_DATE_FORMAT or an assumed default date format.
                  Statements B, C, and D involve incorrect or misleading information:
                  B (qty_sold = '05549821') is misleading and potentially incorrect as leading zeros in a numeric context do not typically require explicit conversion but the presence of spaces might suggest a need for trimming rather than numeric conversion.
                  C (CONCAT(qty_sold, invoice_date)) would indeed require explicit conversion because CONCAT expects string types, and thus numerical and date values must be explicitly converted to strings before concatenation.
                  D (qty_sold BETWEEN '101' AND '110') uses implicit conversion where the string literals '101' and '110' are implicitly converted to numbers if qty_sold is a numeric type.


                  質問 # 31
                  ......

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