Certified 1z0-071 Questions, Exam 1z0-071 Flashcards

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Oracle 1z0-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q371-Q376):

NEW QUESTION # 371
Which two are true about the precedence of opertors and condtions

A. || has a higher order of precedence than +(addition)
B. NOT has a higher order of precedence than AND and OR in a condition.
C. + (addition) has a higher order of precedence than * (mliplpition)
D. Operators are evaluated before conditions.
E. AND and OR have the same order of precedence in a condition

Answer: A,B

Explanation:
Regarding the precedence of operators and conditions in Oracle Database 12c:
* Option B: NOT has a higher order of precedence than AND and OR in a condition.
* In logical operations, NOT is evaluated first, followed by AND and then OR.
* Option E: || has a higher order of precedence than +(addition).
* The string concatenation operator || has a higher precedence than the arithmetic + operator.
Options A, C, and D are incorrect because:
* Option A: Multiplication (*) has a higher precedence than addition (+).
* Option C: AND has a higher precedence than OR.
* Option D: Conditions (which may contain operators) are evaluated according to the rules of operator precedence.

NEW QUESTION # 372
Examine the description of the EMPLOYEES table:

You write this falling statement:
SELECT dept-no AS department_id MAX (salary) AS max-sal
FROM employees
WHERE salary > 10000
GROUP BY department_id
ORDER BY max-sal:
Which clause causes the error?

A. ORDER BY
B. SELECT
C. GROUP BY
D. WHERE

Answer: C

NEW QUESTION # 373
You want to write a query that prompts for two column names and the WHEREcondition each time it is executed in a session but only prompts for the table name the first time it is executed.
The variables used in your query are never undefined in your session.
Which query can be used?

Answer: B

NEW QUESTION # 374
Which three statements are true?

A. The statement will fail because subquery may not be I contained in a values clause.
B. A customer can exist in many countries.
C. The SALES table has five foreign keys.
D. A product can have a different unit price at different times.
E. The statement will fail if a row already exists in the SALES table for product 23.
F. The statement will execute successfully and a new row will be inserted into the SALES table.

Answer: A,B,D

Explanation:
* A. A customer can exist in many countries. This is true as customers can have multiple addresses or operations in different countries, and a database design can reflect this by allowing multiple country entries for a single customer1.
* C. The statement will fail because subquery may not be I contained in a values clause. In Oracle Database 12c, a subquery cannot be used within the VALUES clause of an INSERT statement. The correct approach would be to use the subquery in conjunction with the INSERT INTO ... SELECT syntax if multiple rows are derived from a subquery2.
* F. A product can have a different unit price at different times. It is common for products to have different unit prices at different times due to various factors such as promotions, discounts, or changes in cost price. This can be represented in a database by having a price history table or a similar mechanism to track the changes in price over time1.
Note: The other options are incorrect because:
* B. The statement about the SALES table failing if a row already exists for product 23 is not necessarily true. Oracle allows for multiple rows with the same product ID if the table is designed to handle such cases, like having a composite primary key or no constraints preventing duplicates.
* D. Without specific information about the SALES table's design, we cannot verify the number of foreign keys it has.
* E. The statement about the successful execution and insertion of a new row into the SALES table is too vague without the context of the actual SQL statement being referred to.

NEW QUESTION # 375
The SALES table has columns PROD_ID and QUANTITY_SOLD of data type NUMBER.
Which two queries execute successfully? (Choose two.)

A. SELECT prod_id FROM sales WHERE quantity_sold > 55000 GROUP BY prod_id HAVING COUNT(*) >10;
B. SELECT COUNT (prod_id) FROM sales WHERE quantity_sold > 55000 GROUP BY prod_id;
C. SELECT COUNT(prod_id) FROM sales GROUP BY prod_id WHERE quantity_sold > 55000;
D. SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT(*) > 10 GROUP BY prod_id HAVING COUNT(*) >10;
E. SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT(*) > 10 GROUP BY COUNT(*) >10;

Answer: A,B

NEW QUESTION # 376
......

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