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NEW QUESTION # 31
Which of the following statements contains an error?
Answer: C
Explanation:
The statement that contains an error is option B. This statement is missing the FROM clause, which specifies the table or tables from which to retrieve data. The FROM clause is a mandatory clause in a SELECT statement, unless the statement uses a subquery or a set operator. The correct syntax for option B would be:
SELECT EmpId FROM employee WHERE EmpId=90030 AND DeptId=34
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The other options are either correct or valid SQL statements. For example, option A selects the employee ID from the employee table where the employee ID is equal to 90030; option C selects all columns from the employee table where the employee ID is equal to 90030; option D selects the employee ID from the employee table without any filter condition. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario, execute database tasks using scripting and programming languages.
NEW QUESTION # 32
(A database administrator wants to create a database that does not have a predefined schema. Which of the following tools should the administrator use to create this type of database? Select two.)
Answer: D,E
Explanation:
The correct answers are E. MongoDB and F. Cosmos. CompTIA DataSys+ clearly differentiates between relational databases, which require predefined schemas, and non-relational (NoSQL) databases, which support flexible or schema-less data models. A schema-less database allows data to be stored without enforcing a fixed table structure, making it ideal for rapidly changing data requirements, unstructured data, or applications with evolving schemas.
MongoDB is a document-oriented NoSQL database that stores data in flexible, JSON-like documents. Each document in a MongoDB collection can have a different structure, allowing developers to add or remove fields without modifying a predefined schema. DataSys+ highlights document stores like MongoDB as well- suited for modern applications that require agility, scalability, and the ability to handle semi-structured or unstructured data.
Cosmos (commonly referring to Azure Cosmos DB) is a globally distributed NoSQL database service that supports multiple data models, including core (SQL) API, MongoDB API, and other non-relational models. It is designed for high availability, horizontal scalability, and schema flexibility. DataSys+ includes cloud-based NoSQL platforms such as Cosmos as examples of databases that do not enforce rigid schemas.
Options A, B, C, and D-PostgreSQL, MariaDB, MySQL, and SQL Server-are all relational database management systems (RDBMS). These systems require predefined schemas with fixed table definitions, column data types, and constraints before data can be stored. While some relational systems support limited JSON storage, they are still fundamentally schema-based and do not meet the requirement described in the question.
CompTIA DataSys+ emphasizes selecting database technologies based on data structure and application needs. When schema flexibility is required, NoSQL solutions are preferred. Therefore, the tools best suited for creating a database without a predefined schema are MongoDB and Cosmos, making options E and F the correct and fully verified answers.
NEW QUESTION # 33
Which of the following indicates why a data administrator would conduct a baseline configuration in a database?
Answer: D
Explanation:
A baseline configuration documents the database's state at a specific time, serving as a reference for future changes and ensuring consistency.
NEW QUESTION # 34
Which of the following is used to hide data in a database so the data can only be read by a user who has a key?
Answer: D
Explanation:
The option that is used to hide data in a database so the data can only be read by a user who has a key is data encryption. Data encryption is a process that transforms data into an unreadable or scrambled form using an algorithm and a key. Data encryption helps protect data from unauthorized access or modification by third parties, such as hackers, eavesdroppers, or interceptors. Data encryption also helps verify the identity and authenticity of the source and destination of the data using digital signatures or certificates. Data encryption can be applied to data at rest (stored in a database) or data in transit (transmitted over a network). To read encrypted data, a user needs to have the corresponding key to decrypt or restore the data to its original form. The other options are either different concepts or not related to hiding data at all.
For example, data security is a broad term that encompasses various methods and techniques to protect data from threats or risks; data masking is a technique that replaces sensitive data with fictitious but realistic data to protect its confidentiality or compliance; data protection is a term that refers to the legal or ethical obligations to safeguard personal or sensitive data from misuse or harm.
NEW QUESTION # 35
A business analyst is using a client table and an invoice table to create a database view that shows clients who have not made purchases yet. Which of the following joins is most appropriate for the analyst to use to create this database view?
Answer: D
Explanation:
The join that is most appropriate for the analyst to use to create this database view is option D.
This join uses the LEFT JOIN clause to combine the client table and the invoice table based on the matching values in the Key column. The WHERE clause filters out the rows where the Invoice.Key column is not null, meaning that the client has made a purchase. The result is a view that shows only the clients who have not made any purchases yet. The other options either do not produce the desired result or have syntax errors. For example, option A would show only the clients who have made purchases, option B would show only the invoices that do not have a matching client, and option C would show all the clients regardless of their purchase status.
NEW QUESTION # 36
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