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Oracle 1z0-071 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Using Set Operators	5%	- Use a set operator to combine multiple queries into a single query - Describe set operators - Describe the order of precedence when the set operators are used
Topic 2: Restricting and Sorting Data	6%	- Limit the rows that are retrieved by a query - Sort the rows that are retrieved by a query - Use ampersand substitution to restrict and sort output at runtime - Use DEFINE and UNDEFINE commands
Topic 3: Displaying Data from Multiple Tables Using Joins	15%	- Write SELECT statements to access data from more than one table using equijoins and non-equijoins - Cross join tables - View data that does not meet a join condition by using outer joins - Join a table to itself by using a self-join
Topic 4: Using Conversion Functions and Conditional Expressions	10%	- Use conditional IF THEN ELSE logic in a SELECT statement - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions - Apply the NVL, NULLIF, and COALESCE functions to data - Describe implicit and explicit data type conversion
Topic 5: Using Subqueries to Solve Queries	15%	- List the types of subqueries - Write single-row and multi-row subqueries - Define subqueries - Describe the types of problems that subqueries can solve
Topic 6: Reporting Aggregated Data Using Group Functions	15%	- Describe the use of group functions - Identify the available group functions - Group data by using the GROUP BY clause - Include or exclude grouped rows by using the HAVING clause
Topic 7: Working with Oracle Database SQL	8%	- Explain the installation of Oracle Database software - Start up and shut down a database - Describe the Oracle Database architecture - Create a container database
Topic 8: Retrieving Data Using the SQL SELECT Statement	5%	- Differentiate between SQL statements and SQL*Plus commands - List the capabilities of SQL SELECT statements - Execute a basic SELECT statement
Topic 9: Using DDL Statements to Create and Manage Tables	14%	- Drop, rename, and truncate tables - Review the table structure - Categorize the main database objects - Alter table definitions - Describe the data types that are available for columns - Create a simple table
Topic 10: Manipulating Data	14%	- Control transactions - Delete rows from a table - Insert rows into a table - Describe each data manipulation language (DML) statement - Update rows in a table
Topic 11: Creating Other Schema Objects	10%	- Create synonyms for database objects - Create, maintain, and use sequences - Create, modify, and retrieve data from a view - Create and maintain indexes
Topic 12: Controlling User Access	5%	- Distinguish between granting privileges and roles - Differentiate system privileges from object privileges - Grant privileges on tables and on a view
Topic 13: Using Single-Row Functions to Customize Output	10%	- Describe the differences between single-row and multiple-row functions - Manipulate numbers with the ROUND, TRUNC, and MOD functions - Perform arithmetic with date data - Manipulate dates with the date functions - Manipulate strings with character function in the SELECT and WHERE clauses

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Oracle Database SQL 認定 1z0-071 試験問題 (Q372-Q377):

質問 # 372
View the Exhibit for the structure of the STUDENT and FACULTY tables.

You need to display the faculty name followed by the number of students handled by the faculty at the base location. Examine the following two SQL statements:

Which statement is true regarding the outcome?

A. Both statements 1 and 2 execute successfully and give different results.
B. Both statements 1 and 2 execute successfully and give the same required result.
C. Only statement 2 executes successfully and gives the required result.
D. Only statement 1 executes successfully and gives the required result.

正解：B

質問 # 373
Examine the description of the EMPLOYEES table:

The session time zone is the same as the database server
Which two statements will list only the employees who have been working with the company for more than five years?

A. SELECT employee_ name FROM employees WHERE (SYSNAYW - hire_ data / 12> 3
B. SELECT employee_ name FROM employees WHERE (CUNACV_ DATE - hire_ data / 12> 3
C. There are typos in this option (CUNACV_DATE should be CURRENT_DATE and hire_data should be hire_date). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.
D. SELECT employee_ name FROM employees WHERE (SYSNAYW - hire_ data / 12> 3
E. SELECT employee_ name FROM employees WHERE (SYSTIMESTAMP - hire_ data) / 365>
F. SELECT employee_ name FROM employees WHERE (SYSDATE - hire_ data) / 365>5
G. SELECT employee_ name FROM employees WHERE (CUARENT_ DATE - hire_ data / 365>5

正解：F

解説：
To calculate the length of employment, you would compare the current date to the HIRE_DATE and calculate the difference in years.
A : This is the correct answer. The expression calculates the number of days between the current date (SYSDATE) and the HIRE_DATE, then divides by 365 to convert it to years, and checks if it is greater than 5.
B : SYSTIMESTAMP includes a time component including fractional seconds and time zone information, making this comparison incorrect.
C : There are typos in this option (CUARENT_DATE should be CURRENT_DATE and hire_data should be hire_date). Even with the correct function and column names, CURRENT_DATE returns the current date in the session time zone, not in years.
D : There are typos in this option (SYSNAYW should be SYSDATE). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.
E : This is a repetition of option D with the same issues.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Date Functions"

質問 # 374
Which two statements are true regarding the WHERE and HAVING clauses in a SELECT statement?
(Choose two.)

A. The aggregate functions and columns used in the HAVING clause must be specified in the SELECT list of the query.
B. The WHERE and HAVING clauses can be used in the same statement only if they are applied to different columns in the table.
C. The WHERE clause can be used to exclude rows after dividing them into groups.
D. The HAVING clause can be used with aggregate functions in subqueries.
E. The WHERE clause can be used to exclude rows before dividing them into groups.

正解：C、D

質問 # 375
Which two statements are true about the SET VERIFY ON command?

A. It displays values for variables used only in the WHERE clause of a query.
B. It displays values for variables prefixed with &&.
C. It can be used in SQL Developer and SQL*Plus.
D. It displays values for variables created by the DEFINE command.
E. It can be used only in SQL*plus.

正解：C、D

解説：
The SET VERIFY ON command is related to how SQL*Plus and SQL Developer display information about substitution variables:
* A. It displays values for variables created by the DEFINE command: When VERIFY is set to ON, SQL*Plus and SQL Developer will display the old and new values of a substitution variable when it is redefined using the DEFINE command or when a new value is provided for it during the session.
* B. It can be used in SQL Developer and SQL*Plus: While traditionally associated with SQL*Plus, the SET VERIFY command is also supported in SQL Developer, allowing you to control the display of substitution variable values in both environments.
References:
* Oracle SQL*Plus User's Guide and Reference, especially the section on the SET command and
* substitution variables.

質問 # 376
Which two statements are true regarding non equijoins?

A. The SQL:1999 compliant ANSI join syntax must be used.
B. Table aliases must be used.
C. The ON clause can be used.
D. The Oracle join syntax can be used.
E. The USING clause can be used.

正解：C、D

解説：
Non-equi joins are joins where the join condition is based on something other than equality. In Oracle SQL, you can perform non-equi joins using various clauses:
A . The ON clause can be used: True, the ON clause can specify any condition for the join, including non-equijoins. It is not limited to equijoins.
E . The Oracle join syntax can be used: The traditional Oracle join syntax, which uses the WHERE clause to specify the join condition, can be used for all types of joins, including non-equijoins.
Reference:
Oracle Database SQL Language Reference 12c, especially the sections on join clauses including the ON clause and Oracle's proprietary join syntax.

質問 # 377
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