Oracle 1z0-071 Based on Real Exam Environment

A. False - The CREATE TABLE command cannot include a CREATE INDEX statement within it. Indexes to enforce constraints like primary keys are generally created automatically when the constraint is defined, or they must be created separately using the CREATE INDEX command.

B. True - The owner of the table needs to have enough space quota on the tablespace where the table is going to be created, unless they have the UNLIMITED TABLESPACE privilege. This ensures that the database can allocate the necessary space for the table. Reference: Oracle Database SQL Language Reference, 12c Release 1 (12.1).

C. True - The CREATE TABLE command implicitly commits the current transaction before it executes. This behavior ensures that table creation does not interfere with transactional consistency. Reference: Oracle Database SQL Language Reference, 12c Release 1 (12.1).

D. False - It does not implicitly roll back any pending transactions; rather, it commits them.

E. True - A user must have the CREATE ANY TABLE privilege to create tables in any schema other than their own. To create tables in their own schema, they need the CREATE TABLE privilege. Reference: Oracle Database Security Guide, 12c Release 1 (12.1).

F. False - While the UNLIMITED TABLESPACE privilege allows storing data without quota restrictions on any tablespace, it is not a mandatory requirement for a table owner. Owners can create tables as long as they have sufficient quotas on the specific tablespaces.

Regarding Oracle join and ANSI join syntax:

• B. The Oracle join syntax supports the creation of a Cartesian product of two tables. This is true. In Oracle, if you list tables in the FROM clause without a join condition, it creates a Cartesian product.
• C. The SQL:1999 compliant ANSI join syntax supports natural joins. This is true. ANSI syntax supports natural joins, which join tables based on columns with the same names in the joined tables.
• F. The SQL:1999 compliant ANSI join syntax supports the creation of a Cartesian product of two tables. This is true. The ANSI standard allows for Cartesian products when tables are listed in the FROM clause without a join condition.

Options A, D, E, and G are incorrect:

• A is incorrect because the Oracle join syntax supports all types of joins, including right outer joins.
• D is incorrect because Oracle's proprietary join syntax does not use the term "natural join."
• E is incorrect because there is no inherent performance difference between Oracle join syntax and ANSI join syntax; performance depends on how the query is written and how the database optimizer handles it.
• G is incorrect for the same reason as E.

Examining the execution of SELECT statements in Oracle SQL requires understanding correct syntax, especially regarding aliases and string literals:

• Option A: Incorrect. Although the syntax might seem plausible, using DATE as an alias without quotes can lead to ambiguity because DATE is a reserved keyword in Oracle SQL. This might cause an error or unexpected behavior unless it is enclosed in double quotes.
• Option B: Incorrect. Single quotes are used for string literals in SQL, not for aliasing column names. Using single quotes for aliasing, as in 'CUSTOMER-ID', 'DUES', is syntactically incorrect and will result in an error.
• Option C: Correct. This statement uses valid syntax with no reserved keywords as aliases and no misuse of string literal notation. Aliases are provided without quotes, which is acceptable as long as they are not reserved words or contain special characters.
• Option D: Correct. It correctly uses double quotes for aliasing, which is necessary when using reserved words like "DATE" or special characters. This is a proper use of SQL syntax for aliasing in Oracle.
• Option E: Incorrect. This statement attempts to use aliases with hyphens without enclosing them in double quotes, which leads to syntax errors. Also, customer id seems to be missing an underscore or another connector to properly reference a column name, indicating a typo or error.

For these queries, ensuring correct alias syntax and avoiding reserved keywords without appropriate quoting are key elements for successful execution.

A: True. The DESCRIBE command can indeed be used from SQL Developer as well as other Oracle database tools such as SQL*Plus. This command is used to display the structure of a table, view, or other object, showing information such as column names, data types, and whether a column is nullable.

B: True. The DESCRIBE command can be used to display the structure of an existing view, showing similar information as it would for a table. This includes the columns, their data types, and other pertinent details.

D: True. When DESCRIBE is used, it does display the NOT NULL constraints for columns that have this constraint. This is part of the basic information about the structure of a table or view that can help developers understand the requirements of the data stored therein.