we need to extract features from the raw data before training the model. The signal-to-noise ratio of financial data is low. If we directly use raw data for training, the resulting model will be noisy. In addition to market data (such as stock price and trading ...
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SUM(profit) AS profit FROM sales GROUP BY YEAR, country UNION ALL SELECT YEAR, NULL, NULL, SUM(profit) AS profit FROM sales GROUP BY YEAR UNION ALL SELECT NULL, NULL, NULL, SUM(profit) AS profit FROM sales) AS sum_table ORDER BY YEAR, country, product; +---+---+---+---+ |...