Question
Which data validation step is crucial to ensure that all
entries in a customer email column are correctly formatted?Solution
A regular expression (regex) pattern is commonly used to validate email formats by checking for typical email components (e.g., "[email protected]"). Validating data entries with regex ensures that each email address follows a standard pattern, preventing incorrectly formatted entries from passing through. This step is essential for data quality and accuracy, particularly in fields requiring specific structures, like email addresses in customer data. Option A is incorrect as it checks for completeness, not format accuracy. Option C is incorrect as removing duplicates is a data cleaning step, not a validation step for format. Option D is incorrect as converting to lowercase standardizes data but doesn’t ensure correct email format. Option E is incorrect as checking for numerical entries doesn’t confirm valid email structures.
The average number of comparisons in sequential search is
How many possible boolean functions can be defined on n variables?
 Which network topology connects all nodes in a linear fashion?
Which of the following is a key benefit of using virtual memory?
Which command is used to change the permissions of a file in a Unix/Linux system?
What is the difference between float and double in C?
What is a primary key in the context of the ER model?
What is the purpose of a diode in a circuit?
State true or false
In Hub there is one collision domain and one broadcast domain.
In Switch there is multiple collision domain and o...
Which is correct with respect to the size of the data types in C?