1z0-071参考書内容 & 1z0-071試験解説

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Oracle 1z0-071 Exam Syllabus Topics:

Section	Objectives
Topic 1: Data Manipulation and Schema Objects	- DML operations 1. INSERT, UPDATE, DELETE, MERGE - DDL operations 1. CREATE, ALTER, DROP tables and constraints
Topic 2: Subqueries and Advanced SQL	- Correlated subqueries and nested queries - Single-row and multi-row subqueries
Topic 3: SQL Functions	- Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions - Single-row functions 1. Character, numeric, date functions
Topic 4: Relational Database Concepts	- Data types and database objects overview - Tables, rows, columns, and relational model basics
Topic 5: SQL Retrieval	- Joins and set operations 1. INNER, OUTER, CROSS joins 2. UNION, INTERSECT, MINUS - SELECT statements and filtering data 1. WHERE clause and conditions 2. ORDER BY and row limiting

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1z0-071試験の準備方法｜素敵な1z0-071参考書内容試験｜認定するOracle Database SQL試験解説

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Oracle Database SQL 認定 1z0-071 試験問題 (Q254-Q259):

質問 # 254
Examine the description of the EMPLOYEES table:

Which query is valid?

A. SELECT dept_id, join_date, SUM(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, AVG(NAX(salary)) FROM employees GROUP BY dept_id;

正解：C

解説：
When using the GROUP BY clause, every column in the SELECT clause that is not an aggregate function must be included in the GROUP BY clause:
* A. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id, join_date:
This is a valid query because all non-aggregate columns in the SELECT list (dept_id and join_date) are included in the GROUP BY clause.
Queries B and C are invalid because they attempt to nest aggregate functions, which is not allowed. Query D is invalid because join_date is not included in the GROUP BY clause.
References:
* Oracle Database SQL Language Reference 12c, specifically the section on GROUP BY clause constraints.

質問 # 255
Which three statements are true reading subquenes?

A. Multiple columns or expressions can be compared between the subquery and main query.
B. The subquery and main query must retrieve date from the same table.
C. A Main query can have many subqueries.
D. The subquery and main query can retrieve data from different tables.
E. A subquery can have more than one main query.
F. Only one column or expression can be compared between the subquery and main query.

正解：A、C、D

質問 # 256
Which three statements are true about multiple row subqueries?

A. They can return multiple columns.
B. Two or more values are always returned from the subquery.
C. They can contain GROUP BY clauses.
D. They cannot contain a subquery.
E. They can contain HAVINGclauses.

正解：A、B、C

解説：
Explanation/Reference: https://www.w3resource.com/sql/subqueries/multiplee-row-column-subqueries.php

質問 # 257
Examine the structure of the BOOKS_ TRANSACTIONS table:

Examine the SQL statement:

Which statement is true about the outcome?

A. It displays details only for members who have borrowed before today with RM as TRANSACTION_TYPE.
B. It displays details for only members A101and A102 who have borrowed before today with RM as TRANSACTION_TYPE.
C. It displays details for members who have borrowed before today's date with either RM as TRANSACTION_TYPE or MEMBER_ID as A101 and A102.
D. It displays details for members who have borrowed before today with RM as TRANSACTION_TYPE and the details for members A101 or A102.

正解：A

質問 # 258
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 HAVING clause can be used with aggregate functions in subqueries.
C. The WHERE and HAVING clauses can be used in the same statement only if they are applied to different columns in the table.
D. The WHERE clause can be used to exclude rows after dividing them into groups.
E. The WHERE clause can be used to exclude rows before dividing them into groups.

正解：B、D

質問 # 259
......

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