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Oracle 1z1-071 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Restricting and Sorting Data	6%	- Limit the rows that are retrieved by a query - Use DEFINE and UNDEFINE commands - Use ampersand substitution to restrict and sort output at runtime - Sort the rows that are retrieved by a query
Topic 2: Retrieving Data Using the SQL SELECT Statement	5%	- Execute a basic SELECT statement - List the capabilities of SQL SELECT statements - Differentiate between SQL statements and SQL*Plus commands
Topic 3: Creating Other Schema Objects	10%	- Create, modify, and retrieve data from a view - Create and maintain indexes - Create, maintain, and use sequences - Create synonyms for database objects
Topic 4: Using DDL Statements to Create and Manage Tables	14%	- Create a simple table - Categorize the main database objects - Drop, rename, and truncate tables - Describe the data types that are available for columns - Review the table structure - Alter table definitions
Topic 5: Manipulating Data	14%	- Update rows in a table - Control transactions - Delete rows from a table - Insert rows into a table - Describe each data manipulation language (DML) statement
Topic 6: 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 7: Controlling User Access	5%	- Grant privileges on tables and on a view - Distinguish between granting privileges and roles - Differentiate system privileges from object privileges
Topic 8: Reporting Aggregated Data Using Group Functions	15%	- Identify the available group functions - Describe the use of group functions - Include or exclude grouped rows by using the HAVING clause - Group data by using the GROUP BY clause
Topic 9: Displaying Data from Multiple Tables Using Joins	15%	- 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 - Write SELECT statements to access data from more than one table using equijoins and non-equijoins
Topic 10: Using Conversion Functions and Conditional Expressions	10%	- Describe implicit and explicit data type conversion - 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
Topic 11: Using Subqueries to Solve Queries	15%	- List the types of subqueries - Define subqueries - Write single-row and multi-row subqueries - Describe the types of problems that subqueries can solve
Topic 12: Using Single-Row Functions to Customize Output	10%	- Manipulate numbers with the ROUND, TRUNC, and MOD functions - Describe the differences between single-row and multiple-row functions - Perform arithmetic with date data - Manipulate dates with the date functions - Manipulate strings with character function in the SELECT and WHERE clauses
Topic 13: Working with Oracle Database SQL	8%	- Start up and shut down a database - Describe the Oracle Database architecture - Explain the installation of Oracle Database software - Create a container database

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Oracle Database SQL 認定 1z1-071 試験問題 (Q344-Q349):

質問 # 344
Examine the description of the EMPLOYEES table:

Which query is valid?

A. SELECT dept_id, AVG(NAX(salary)) FROM employees GROUP BY dept_id;
B. SELECT dept_id, MAX (AVG(salary)) FROM employees GROUP BY dept_id;
C. SELECT dept_id, join date, SUM(salary) FROM employees GROUP BY dept_id,join_date;
D. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id;

正解：C

質問 # 345
Which two statements are true about the results of using the INTERSECT operator in compound queries? (Choose two.)

A. INTERSECT returns rows common to both sides of the compound query.
B. Reversing the order of the intersected tables can sometimes affect the output.
C. Column names in each SELECT in the compound query can be different.
D. The number of columns in each SELECT in the compound query can be different.
E. INTERSECT ignores NULLs.

正解：C、E

質問 # 346
Examine this SQL statement:

Which two are true?

A. The subquery is not a correlated subquery.
B. The subquery is executed before the UPDATE statement is executed.
C. All existing rows in the ORDERS table are updated.
D. The subquery is executed for every updated row in the ORDERS table.
E. The UPDATE statement executes successfully even if the subquery selects multiple rows.

正解：B、D

解説：
The provided SQL statement is an update statement that involves a subquery which is correlated to the main query.
* A. The subquery is executed before the UPDATE statement is executed. (Incorrect) This statement is not accurate in the context of correlated subqueries. A correlated subquery is one where the subquery depends on values from the outer query. In this case, the subquery is executed once for each row that is potentially updated by the outer UPDATE statement because it references a column from the outer query (o.customer_id).
* B. All existing rows in the ORDERS table are updated. (Incorrect)
Without a WHERE clause in the outer UPDATE statement, this would typically be true. However, the correctness of this statement depends on the actual data and presence of matching customer_id values in both tables. If there are rows in the ORDERS table with customer_id values that do not exist in the CUSTOMERS table, those rows will not be updated.
* C. The subquery is executed for every updated row in the ORDERS table. (Correct) Because the subquery is correlated (references o.customer_id from the outer query), it must be executed for each row to be updated in the ORDERS table to get the corresponding cust_last_name from the CUSTOMERS table.

質問 # 347
View the Exhibit and examine the structure in the DEPARTMENTS tables. (Choose two.)

Examine this SQL statement:
SELECT department_id "DEPT_ID", department_name, 'b' FROM
departments
WHERE departments_id=90
UNION
SELECT department_id, department_name DEPT_NAME, 'a' FROM
departments
WHERE department_id=10
Which two ORDER BY clauses can be used to sort output?

A. ORDER BY DEPT_NAME;
B. ORDER BY DEPT_ID;
C. ORDER BY 3;
D. ORDER BY 'b';

正解：B、C

質問 # 348
Evaluate the following SQL query;

What would be the outcome?

A. 0
B. 1
C. 2
D. 3
E. 4

正解：E

解説：
Function Purpose ROUND(column|expression, n) Rounds the column, expression, or value to n decimal places or, if n is omitted, no decimal places (If n is negative, numbers to the left of decimal point are rounded.) TRUNC(column|expression, n) Truncates the column, expression, or value to n decimal places or, if n is omitted, n defaults to zero

質問 # 349
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