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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL 認定 1z1-071 試験問題 (Q183-Q188):

質問 # 183
View the exhibit and examine the description of SALES and PROMOTIONS tables.

You want to delete rows from the SALES table, where the PROMO_NAME column in the PROMOTIONS table has either blowout sale or everyday low price as values.
Which three DELETE statements are valid? (Choose three.)

A. DELETEFROM salesWHERE promo_id = (SELECT promo_idFROM promo_name = 'blowout sale')AND promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'everyday low price')FROM promotionsWHERE promo_name = 'everyday low price');
B. DELETEFROM salesWHERE promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale')OR promo_name = 'everyday low price');
C. DELETEFROM salesWHERE promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale')OR promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'everyday low price')
D. DELETEFROM salesWHERE promo_id IN (SELECT promo_idFROM promotionsWHERE promo_name IN = 'blowout sale','everyday low price'));

正解：B、C、D

質問 # 184
View the Exhibit and examine the structure of ORDER_ITEMS and ORDERS tables.

You need to remove from the ORDER_ITEMS table those rows that have an order status of 0 or 1 in the ORDERS table.
Which two DELETE statements are valid (Choose two.)

A. DELETE FROM order_items iWHERE order_id = (SELECT order_id FROM orders oWHERE i.order_id = o.order_id AND order_status IN (0,1));
B. DELETE *FROM order_itemsWHERE order_id IN (SELECT order_id)FROM ordersWHERE order_status IN (0,1));
C. DELETEFROM order_itemsWHERE order_id IN (SELECT order_idFROM ordersWHERE orders_status in (0,1));
D. DELETEFROM (SELECT * FROM order_items I,orders oWHERE i.order_id = o.order_id AND order_status IN (0,1));

正解：C、D

質問 # 185
Which three statements are true about Data Manipulation Language (DML)?

A. insert statements can insert nulls explicitly into a column.
B. DML statements require a primary key be defined on a table.
C. update statements can have different subqueries to specify the values for each updated column.
D. insert into. . .select. . .from statements automatically commit.
E. delete statements can remove multiple rows based on multiple conditions.

正解：A、C、E

解説：
Data Manipulation Language (DML) operations in Oracle 12c are critical for handling data within tables. Here's the validity of each statement based on Oracle SQL documentation:
Option A: True. The DELETE statement can remove multiple rows from a table and supports the use of multiple conditions in the WHERE clause to specify which rows should be removed. This allows for flexibility in managing data deletion based on various criteria.
Option B: True. The INSERT statement can explicitly insert NULL values into a column, assuming there are no constraints (like NOT NULL) preventing such entries. This is useful for representing the absence of data or when data is unknown.
Option C: False. DML statements like INSERT INTO...SELECT...FROM do not automatically commit in Oracle. Transactions in Oracle require explicit COMMIT commands to finalize changes, unless in an autocommit mode set by a client tool or environment, which is generally not the default behavior for server-side operations.
Option D: False. DML statements do not require a primary key to be defined on a table. While having a primary key is a best practice for identifying each row uniquely, it's not a prerequisite for performing DML operations like INSERT, UPDATE, or DELETE.
Option E: True. The UPDATE statement can include different subqueries within the SET clause to determine the values for each column being updated. This allows for complex calculations and data retrieval to be part of an update, increasing the power and flexibility of data modification.

質問 # 186
Examine the description of the BOOKS table:

The table has 100 rows.
Examine this sequence of statements issued in a new session;
INSERT INTO BOOKS VALUES ('ADV112' , 'Adventures of Tom Sawyer', NULL, NULL); SAVEPOINT a; DELETE from books; ROLLBACK TO SAVEPOINT a; ROLLBACK; Which two statements are true?

A. The second ROLLBACK command replays the delete.
B. The second ROLLBACK command undoes the insert.
C. The second ROLLBACK command does nothing.
D. The first ROLLBACK command restores the 101 rows that were deleted and commits the inserted row.
E. The first ROLLBACK command restores the 101 rows that were deleted, leaving the inserted row still to be committed.

正解：B、E

質問 # 187
View the Exhibit and examine the structure of ORDERS and ORDER_ITEMS tables.
ORDER_ID is the primary key in the ORDERS table. It is also the foreign key in the ORDER_ITEMS table wherein it is created with the ON DELETE CASCADE option.
Which DELETE statement would execute successfully?

A. DELETE ordersWHERE order_total < 1000;
B. DELETE order_idFROM ordersWHERE order_total < 1000;
C. DELETE orders o, order_items IWHERE o.order_id = i.order_id;
D. DELETEFROM ordersWHERE (SELECT order_idFROM order_items);

正解：D

質問 # 188
......

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