Information about Oracle 1z0-071 Exam

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Oracle 1z0-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q177-Q182):

NEW QUESTION # 177
Which task can be performed by using a single Data Manipulation Language (DML) statement?

A. removing all data only from a single column on which a primary key constraint is defined
B. removing all data only from a single column on which a unique constraint is defined
C. adding a column constraint while inserting a row into a table
D. adding a column with a default value while inserting a row into a table

Answer: B

NEW QUESTION # 178
View the exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTSand TIMEStables.

The PROD_IDcolumn is the foreign key in the SALEStable referencing the PRODUCTStable.
The CUST_IDand TIME_IDcolumns are also foreign keys in the SALEStable referencing the CUSTOMERS and TIMEStables, respectively.
Examine this command:
CREATE TABLE new_sales (prod_id, cust_id, order_date DEFAULT SYSDATE)
AS
SELECT prod_id, cust_id, time_id
FROM sales;
Which statement is true?

A. The NEW_SALEStable would not get created because the column names in the CREATETABLE command and the SELECTclause do not match.
B. The NEW_SALEStable would not get created because the DEFAULTvalue cannot be specified in the column definition.
C. The NEW_SALEStable would get created and all the FOREIGNKEYconstraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.
D. The NEW_SALEStable would get created and all the NOTNULLconstraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.

Answer: D

NEW QUESTION # 179
Which two are true about using constraints?

A. NOT NULL can be specified at the column and at the table level.
B. A table can have multiple PRIMARY KEY and multiple FOREIGN KEY constraints.
C. A table can have only one PRIMARY KEY but may have multiple FOREIGN KEY constraints.
D. A FOREIGN KEY column in a child table and the referenced PRIMARY KEY column in the parenttable must have the same names.
E. PRIMARY KEY and FOREIGNY constraints can be specified at the column and at the table level
F. A table can have only one PRIMARY KEY and one FOREIGN KEY constraint.

Answer: C,E

Explanation:
In Oracle Database 12c, it is important to understand the behavior and properties of constraints.
A . This statement is false. A FOREIGN KEY column in a child table does not need to have the same name as the referenced PRIMARY KEY column in the parent table. What is required is that the data type is the same and that the values in the FOREIGN KEY column correspond to values in the PRIMARY KEY column of the parent table.
B . This statement is false. A table cannot have multiple PRIMARY KEY constraints. By definition, a PRIMARY KEY is a unique identifier for a row in a table, and there can only be one such identifier.
C . This statement is false for the same reasons as B; a table can have only one PRIMARY KEY. However, it can have multiple FOREIGN KEY constraints that reference PRIMARY KEYS in other tables.
D . This is true. PRIMARY KEY and FOREIGN KEY constraints can indeed be specified at the column level with the column definition or at the table level with the ALTER TABLE statement.
E . This is true. A table can have only one PRIMARY KEY constraint because it defines a unique row identifier. However, it can have multiple FOREIGN KEY constraints referencing keys in other tables, allowing for complex relational structures.
F . This statement is false. NOT NULL constraints are always defined at the column level, as they apply to individual columns. They cannot be specified at the table level.
Reference:
Oracle Documentation on Constraints: https://docs.oracle.com/database/121/SQLRF/clauses002.htm#SQLRF52271 Oracle Documentation on NOT NULL Constraints: https://docs.oracle.com/database/121/SQLRF/clauses002.htm#SQLRF52162

NEW QUESTION # 180
View the exhibit and examine the description for the SALES and CHANNELS tables.

You issued this SQL statement:

Which statement is true regarding the result?

A. The statement will fail because the VALUES clause is not required with a subquery.
B. The statement will fail because the subquery in the VALUES clause is not enclosed within single quotation marks.
C. The statement will fail because a subquery cannot be used in a VALUES clause.
D. The statement will execute and a new row will be inserted in the SALES table.

Answer: D

NEW QUESTION # 181
View the Exhibit and examine the structure of ORDERS and CUSTOMERS tables.

There is only one customer with the cust_last_name column having value Roberts. Which INSERT statement should be used to add a row into the ORDERS table for the customer whose CUST_LAST_NAME is Roberts and CREDIT_LIMIT is 600?

A. INSERT INTO orders (order_id, order_data, order_mode,(SELECT customer_idFROM customersWHERE cust_last_name='Roberts' ANDcredit_limit=600), order_total)VALUES(1, '10-mar-2007', 'direct', &&customer_id, 1000);
B. INSERT INTO orders (order_id, order_data, order_mode,(SELECT customer_idFROM customersWHERE cust_last_name='Roberts' ANDcredit_limit=600), order_total)VALUES (1, '10-mar-2007', 'direct', &customer_id, 1000).
C. INSERT INTO(SELECT o.order_id, o.order_date, o.order_mode, c.customer_id, o.order_totalFROM orders o, customers cWHERE o.customer_id = c.customer_idAND c.cust_last_name='Roberts' AND c.credit_limit=600 )VALUES (1, '10-mar-2007', 'direct', (SELECT customer_idFROM customersWHERE cust_last_name='Roberts' ANDcredit_limit=600), 1000);
D. INSERT INTO ordersVALUES(1, '10-mar-2007', 'direct',(SELECT customer_idFROM customersWHERE cust_last_name='Roberts' ANDcredit_limit=600), 1000);

Answer: D

NEW QUESTION # 182
......

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