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Oracle 1z0-071 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Displaying Data from Multiple Tables	15%	- Self-joins and outer joins - Cartesian products - Equijoins and non-equijoins
Topic 2: Using Subqueries to Solve Queries		- Single-row and multi-row subqueries - Correlated subqueries for update/delete
Topic 3: Restricting and Sorting Data	15%	- ORDER BY clause and sorting rules - WHERE clause and filtering conditions - Substitution variables, DEFINE and VERIFY commands - Operator precedence
Topic 4: Working with Time Zones and Date/Time Data		- Time zone conversion functions - TIMESTAMP, INTERVAL data types
Topic 5: Retrieving Data Using SQL SELECT Statement	20%	- Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage
Topic 6: Managing Indexes, Synonyms and Sequences		- Create and maintain indexes - Create and use sequences - Create and use synonyms
Topic 7: Aggregating Data Using Group Functions	10%	- SUM, AVG, COUNT, MAX, MIN functions - GROUP BY and HAVING clauses - Handling NULLs in group functions
Topic 8: Using Single-Row Functions to Customize Output	20%	- Character, number, and date functions - Nested functions usage
Topic 9: Managing Views		- Create, modify and drop views - Updatable and read-only views
Topic 10: Controlling User Access		- Roles, granting and revoking privileges - System and object privileges
Topic 11: Conversion Functions and Conditional Expressions	10%	- NVL, NULLIF, COALESCE and CASE expressions - TO_CHAR, TO_NUMBER, TO_DATE functions - Implicit and explicit data type conversion
Topic 12: Managing Tables and Constraints		- Constraints: primary key, foreign key, unique, check, not null - Data types, creating/altering/dropping tables - Temporary and external tables
Topic 13: Using SET Operators		- UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations
Topic 14: Using Data Dictionary Views		- Retrieve metadata and object information
Topic 15: Manipulating Data and Managing Transactions		- INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts - Transaction control: COMMIT, ROLLBACK, SAVEPOINT
Topic 16: Relational Database Concepts	10%	- Theoretical and physical aspects of relational databases - Relationship between database and SQL - ERD and SQL statement mapping

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Oracle Database SQL 認定 1z0-071 試験問題 (Q218-Q223):

質問 # 218
The STORES table has a column START_ DATE of data type DATE, containing the date the row was inserted.
You only want to display details of rows where START_ DATE is within the last 25 months.
Which WHERE clause can be used?

A. WHERE ADD_ MONTHS (start_ date, 25) <= SYSDATE
B. WHERE MONTHS_ BETWEEN (SYSDATE, start_ date) <= 25
C. WHERE MONTHS_ BETWEEN (start_ date, SYSDATE) <= 25
D. WHERE TO_ NUMBER (start_ date - SYSDATE) <= 25

正解：B

質問 # 219
Which three privileges can be restricted to a subset of columns in a table? (Choose three.)

A. ALTER
B. UPDATE
C. REFERENCES
D. INDEX
E. DELETE
F. SELECT
G. INSERT

正解：B、E、F

解説：
Explanation

質問 # 220
Which two statements are true about Oracle synonyms? (Choose two.)

A. A synonym can be created on an object in a package.
B. A synonym can have a synonym.
C. A synonym has an object number.
D. All private synonym names must be unique in the database.
E. Any user can create a PUBLICsynonym.

正解：A、D

解説：
Explanation/Reference: https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_7001.htm

質問 # 221
Which two statements are true regarding the EXISTS operator used in the correlated subqueries? (Choose two.)

A. It is used to test whether the values retrieved by the inner query exist in the result of the outer query.
B. It is used to test whether the values retrieved by the outer query exist in the result set of the inner query.
C. The outer query stops evaluating the result set of the inner query when the first value is found.
D. The outer query continues evaluating the result set of the inner query until all the values in the result set are processed.

正解：B、C

解説：
http://www.techonthenet.com/oracle/exists.php

質問 # 222
Examine the description of the CUSTOMERStable:

CUSTNOis the PRIMARY KEY.
You must determine if any customers' details have been entered more than once using a different CUSTNO, by listing all duplicate names.
Which two methods can you use to get the required result? (Choose two.)

A. self join
B. subquery
C. RIGHT OUTER JOINwith self join
D. FULL OUTER JOINwith self join
E. LEFT OUTER JOINwith self join

正解：A、B

質問 # 223
......

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