现已上线！2025 年 Telegram 研究 — 年度关键洞察 
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Next quiz Wednesday at 21:00
Q8/10: Which clause is used to filter records after applying aggregate functions?
Q7/10: Which SQL clause is used to sort the result-set?
Q6/10: Which of the following is considered an aggregate function?
Q5/10: Which function returns both the current date and time in MySQL?
Q4/10: What is the output of the function ROUND(15.72, 1)?
Q3/10: Which string function is used to convert all characters to uppercase?
Q2/10: What does the POWER(X, Y) function do in MySQL?
Q1/10: Which of the following is a DDL command in MySQL?
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🎉 Quiz Finished! 🎉
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Next quiz Sunday at 21:00
Q10/10: HOTS: What does df.apply(np.max, axis=1) compute?
Q9/10: Assertion: DataFrame.fillna(0) modifies the original DataFrame permanently. Reason: To modify the original object, inplace=True must be used.
Q8/10: HOTS: What will df.loc['A':'C'] return if the DataFrame index is ['A', 'B', 'C', 'D']?
Q7/10: Which parameter in df.to_csv() prevents the row index from being written to the output file?
Q6/10: How do you save a PyPlot figure to an image file like PNG?
Q5/10: What is the output of df.tail(-3) if df has exactly 5 rows?
Q4/10: Assertion: .iloc[] can be used to slice a DataFrame using string labels. Reason: .iloc[] is purely integer-location based indexing.
