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Python Institute Certified Associate Data Analyst with Python (PCAD-31-02) Sample Questions:

1. Which technique is considered a primary defense against SQL injection when executing database queries from Python?

A) Closing the database cursor after each query
B) Encrypting the database connection
C) Using parameterized queries
D) Escaping quotes manually in SQL strings

2. What is the most appropriate way to ensure that a column used as a foreign key contains only valid references to a parent DataFrame in Pandas?

A) Use df.merge() with how='outer'
B) Use .isin() to compare the foreign key column against the parent key column
C) Use df.dropna() on the foreign key column
D) Use df.sort_values() to sort both columns before merging

3. What is the best approach when comparing SQL NULL values with Python data during conditional checks?

A) Use Python's None and SQL's IS NULL clause
B) Replace NULL with zero before importing
C) Use == None directly in SQL queries
D) Convert all NULL to string before comparison

4. What does the standard deviation of a dataset represent in the context of statistical analysis?

A) The number of outliers in the dataset
B) The most frequently occurring value
C) The average squared distance from the mean
D) The sum of all values in the dataset

5. Which actions are considered best practices when managing datasets in Python using pandas?
(Choose two)

A) Always convert all columns to strings
B) Use .describe() for summary statistics
C) Use .info() to understand dataset structure
D) Replace missing values with hardcoded zeros without analysis

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