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Oracle Database SQL 1z0-071 Prüfungsfragen mit Lösungen (Q104-Q109):

104. Frage
Which two are true about granting privilege on objects?

A. An object privilege can be granted to other users only by the owner of that object
B. An object privilege can be granted to a role only by the owner of that object
C. The WITH GRANT OPTION clause can be used only by DBA users
D. A table owner must grant the REFERENCES privilege to allow other users to create FOREIGN KEY constraints using that table
E. The owner of an object acquires all object privilege on that object by default

Antwort: D,E

Begründung:
C: True, the owner of an object automatically has all object privileges for that object by default. This is an inherent property of the object owner in Oracle.D. True, to allow the creation of foreign key constraints that reference a particular table, the owner of the table must grant the REFERENCES privilege on the key columns to other users or roles.
A; B, and E are not correct because: A. Object privileges can be granted to a role by any user with the appropriate permissions, not only by the owner. B. Object privileges can also be granted by users who have been given the privileges with the WITH GRANT OPTION, not just by the owner. E. The WITH GRANT OPTION is not limited to DBA users; it can be used by any user who has the privilege to grant a specific object privilege.
References:
* Oracle documentation on object privileges: Oracle Database SQL Language Reference
* Oracle documentation on the REFERENCES privilege: Oracle Database Security Guide

105. Frage
Which two true about a sql statement using SET operations such as UNION?

A. The data type of each column returned by the second query must be implicitly convertible to the data type of the corresponding column returned by the first query
B. The number, but not names, of columns must be identical for all SELECT statements in the query
C. The names and number of columns must be identical for all SELECT statements in the query.
D. The data type of each column retuned by the second query must exactly match the data type of the corresponding column returned by the first query
E. The data type group of each column returned by the second query must match the data type group of the corresponding column returned by the first query

Antwort: A,B

Begründung:
In the context of SQL statements using SET operations like UNION in Oracle Database 12c:
A . The data type of each column returned by the second query must be implicitly convertible to the data type of the corresponding column returned by the first query. This is correct. Oracle allows the union of columns as long as their data types are implicitly convertible, not necessarily identical.
C . The number, but not names, of columns must be identical for all SELECT statements in the query. This is correct. For a UNION operation to be valid, all SELECT statements involved must have the same number of columns, although their names and exact data types need not match.
Options B, D, and E are incorrect:
B is incorrect because exact data type matches are not required, only that they be implicitly convertible.
D is also incorrect for the same reason as B; it's enough that the types are compatible, not identical.
E is incorrect as the names

106. Frage
Which statement will return a comma-separated list of employee names in alphabetical order for each department in the EMP table?

A. SELECT deptno,LISTAGG(ename, ' , ') WITHIN GROUP AS employee_list FROM emp GROUP BY deptno;
B. SELECT deptno,LISTAGG(ename, ', ') WITHIN GROUP (ORDER BY ename) AS employee_list FROM emp GROUP BY deptno;
C. SELECT deptno,LISTAGG(ename, ', ') WITHIN GROUP (GROUP BY deptno) AS employee_list FROM emp ORDER BY ename;
D. SELECT deptno,LISTAGG(ename, ', ') WITHIN GROUP AS employee_list FROM emp GROUP BY deptno ORDER BY ename;

Antwort: B

Begründung:
The LISTAGG function is used in Oracle to aggregate strings from data in a group specified by the GROUP BY clause, producing a single row of concatenated values. The correct syntax also specifies an ORDER BY clause within the WITHIN GROUP parenthesis to sort the values in the concatenated list.
The correct query is:
SELECT deptno, LISTAGG(ename, ', ') WITHIN GROUP (ORDER BY ename) AS employee_list FROM emp GROUP BY deptno; This statement will return a comma-separated list of employee names (ename) in alphabetical order for each department (deptno) in the EMP table.

107. Frage
Evaluate the following two queries:

Which statement is true regarding the above two queries?

A. Performance would improve in query 2.
B. Performance would degrade in query 2.
C. There would be no change in performance.
D. Performance would improve in query 2 only if there are null values in the CUST_CREDIT_LIMIT column.

Antwort: C

108. Frage
Which three statements are true about the Oracle join and ANSI Join syntax?

A. The Oracle join syntax supports natural joins.
B. The SQL:1999 compliant ANSI join syntax supports creation of a Cartesian product of two tables.
C. The Oracle join syntax only supports right outer joins,
D. The Oracle join syntax performs less well than the SQL:1999 compliant ANSI Join Answer.
E. The SQL:1999 compliant ANSI join syntax supports natural joins.
F. The Oracle join syntax performs better than the SQL:1999 compliant ANSI join syntax.
G. The Oracle join syntax supports creation of a Cartesian product of two tables.

Antwort: B,E,G

Begründung:
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.

109. Frage
......

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Oracle 1z0-071 Dumps & 1z0-071 Übungsmaterialien

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Oracle Database SQL 1z0-071 Prüfungsfragen mit Lösungen (Q104-Q109):

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