Data Management Foundations (C175 )
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Free Data Management Foundations (C175 ) Questions
What does the SQL command 'UPDATE Horse SET WHERE' do
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Inserts new data into the Horse table
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Updates data in the Horse table based on conditions
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Creates a new table named Horse
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Deletes data from the Horse table
Explanation
Correct Answer B. Updates data in the Horse table based on conditions
Explanation
The UPDATE command modifies existing data in a table. The SET clause specifies which columns to update and with what values, while the WHERE clause applies the update to rows that meet specific conditions. Without a WHERE clause, the update would apply to all rows in the table.
Why other options are wrong
A. Inserts new data into the Horse table
The UPDATE command does not insert new data. Inserting new data is done with the INSERT INTO command.
C. Creates a new table named Horse
The UPDATE command does not create a table. Creating a table is done with the CREATE TABLE command.
D. Deletes data from the Horse table
Deletes data from the Horse tableThe UPDATE command does not delete data. Deleting data is done using the DELETE command.
What type of entity does not have sufficient attributes to form a primary key according to the text
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Weak
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Strong
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Business
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Child
Explanation
Correct Answer A. Weak
Explanation
A weak entity is an entity that cannot form a primary key on its own because it lacks sufficient attributes. It relies on a strong (parent) entity for its identification, often through a foreign key relationship and a partial key.
Why other options are wrong
B. Strong: A strong entity can exist independently and has sufficient attributes to form a primary key.
C. Business: This is not a type of entity in database terminology, so it is irrelevant in this context.
D. Child: While a child entity may depend on a parent entity in a relationship, the term does not specifically define its ability to form a primary key.
Why have software vendors adopted the Chen representation according to the text
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Detailed representation
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Implementation orientation
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Business focus
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Compact representation
Explanation
Correct Answer A. Detailed representation
Explanation
Software vendors have adopted the Chen representation because it provides a detailed and clear way of modeling relationships, attributes, and entities. This representation makes it easy to visualize the structure and design of a database system.
Why other options are wrong
B. Implementation orientation: Chen representation is more about conceptual clarity than focusing on implementation details.
C. Business focus: While Chen notation can be applied in business contexts, its primary strength lies in its visual detail rather than specific business alignment.
D. Compact representation: Chen representation is not compact; it is more detailed and visually comprehensive compared to other methods like UML.
What is the difference between data and information in Business Intelligence
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Data is raw value elements, while information is organized data with context.
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Data is processed facts, while information is unprocessed.
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Data is inferred, while information is calculated.
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Data is collected, while information is stored.
Explanation
Correct Answer A. Data is raw value elements, while information is organized data with context.
Explanation
Data refers to unprocessed, raw elements that serve as inputs for analysis, while information is processed, organized, and structured data that provides meaning or context. In Business Intelligence, the distinction helps define how raw inputs transform into actionable insights.
Why other options are wrong
B. Data is not processed facts; that description applies to information. Information is derived after processing data.
C. Data is not inferred; inference involves analyzing data to draw conclusions, which is a step beyond raw data.
D. Data is not simply collected while information is stored. Both data and information can be stored, but their difference lies in processing and organization.
What does the SQL command 'CREATE TABLE Movie' do
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Deletes the Movie table
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Updates the data in the Movie table
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Creates a table named Movie with specified columns and data types
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Adds a new column to the Movie table
Explanation
Correct Answer C. Creates a table named Movie with specified columns and data types
Explanation
The CREATE TABLE command in SQL is used to create a new table in the database. The table is named as specified (e.g., Movie), and the command typically includes definitions for columns and their data types.
Why other options are wrong
A. Deletes the Movie table
The CREATE TABLE command does not delete a table. Deleting a table is done using the DROP TABLE command.
B. Updates the data in the Movie table
The CREATE TABLE command does not update data in a table. Updating data is done using the UPDATE command.
D. Adds a new column to the Movie table
Adds a new column to the Movie tableAdding a new column to an existing table is done using the ALTER TABLE command, not CREATE TABLE.
What is the foundation of information, which is the bedrock of knowledge
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Metadata
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Knowledge
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DBMS
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Data
Explanation
Correct Answer D. Data
Explanation
Data is the foundation of information. It consists of raw, unprocessed facts and figures, which, when organized and given context, become information. Information, in turn, serves as the building block of knowledge when analyzed and interpreted.
Why other options are wrong
A. Metadata is data about data, such as information describing the structure or attributes of other data. While important, it is not the foundation of information itself.
B. Knowledge is derived from information and data, not the foundation of information.
C. DBMS (Database Management System) is a tool used to manage and store data but is not the foundation of information.
What is the character data type also known as
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Numeric
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String
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Integer
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Decimal
Explanation
Correct Answer B. String
Explanation
The character data type is commonly known as a string. It is used to store text or sequences of characters in a database. Strings can include letters, numbers, and special characters, but they are treated as text rather than numeric values.
Why other options are wrong
A. Numeric: Numeric data types are used for numbers, not characters or text. Characters cannot be processed mathematically like numeric values.
C. Integer: An integer represents whole numbers, which are numeric and do not include text. The character data type is distinctly different from integers.
D. Decimal: Decimal is a numeric data type used for storing fractional or precise values, and it is unrelated to character or string data.
Which command would you use when making corrections to the PRODUCT table
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CHANGE PRODUCT SET P_INDATE WHERE P_CODE
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ROLLBACK PRODUCT SET P_INDATE WHERE P_CODE
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EDIT PRODUCT SET P_INDATE WHERE P_CODE
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UPDATE PRODUCT SET P_INDATE WHERE P_CODE
Explanation
Correct Answer D. UPDATE PRODUCT SET P_INDATE WHERE P_CODE
Explanation
The UPDATE command is used to modify existing records in a table. The syntax UPDATE PRODUCT SET P_INDATE WHERE P_CODE specifies updating the P_INDATE column for records in the PRODUCT table where the condition P_CODE is met.
Why other options are wrong
A. CHANGE is not a valid SQL command and will result in an error if executed. The correct syntax for modifying data in a table is UPDATE, not CHANGE.
B. ROLLBACK is used to undo changes made in a transaction, not to update or modify data. Using this command here would not achieve the intended result of updating a record.
C. EDIT is not recognized as a valid SQL command for data modification. Updates to table data require the use of the UPDATE command with the appropriate conditions.
How is the one to many (1:M) relationship implemented in the relational model
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Not Sure
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True
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Maybe
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False
Explanation
Correct Answer B. True
Explanation
In the relational model, a one-to-many (1:M) relationship is implemented by linking a primary key in the "one" table to a foreign key in the "many" table. This setup ensures that each record in the "one" table can be associated with multiple records in the "many" table, maintaining relational integrity.
Why other options are wrong
A. Not Sure: This does not provide a definitive or meaningful answer to the question.
C. Maybe: The implementation of a 1:M relationship is a well-established practice, so "maybe" is not a valid response.
D. False: It is incorrect to claim that the 1:M relationship cannot be implemented in the relational model, as it is a fundamental concept in relational databases.
What is a relationship defined as according to the text
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Association between Entities only
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Association between Objects only
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Association between Objects, Entities, Databases, Fields
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Association between Databases only
Explanation
Correct Answer A. Association between Entities only
Explanation
A relationship in database terminology refers to the association between two or more entities. This association helps define how entities interact with one another in a database model.
Why other options are wrong
B. Association between Objects only: Relationships in databases are not limited to objects but primarily focus on entities.
C. Association between Objects, Entities, Databases, Fields: This is an overly broad definition that includes concepts unrelated to the core database definition of a relationship.
D. Association between Databases only: Relationships are about the connections between entities, not databases themselves.
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