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This script is designed to compare the prices of stocks between two consecutive days. It specifically identifies stocks whose prices are expected to increase the next day. The script uses two tables: 'price_today' and 'price_tomorrow', which represent the stock prices for the current day and the next day respectively.
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The script works by performing an INNER JOIN operation on the 'price_today' and 'price_tomorrow' tables based on the 'stock_code'. This operation combines rows from both tables that have the same 'stock_code'. The WHERE clause then filters out the rows where the price for the next day ('price_tomorrow') is greater than the price for the current day ('price_today'). The result is a list of stocks that are expected to increase in price the next day. The list is then ordered in ascending order by 'stock_code'.
SELECT a.stock_code FROM price_today as a INNER JOIN price_tomorrow as b ON a.stock_code = b.stock_code WHERE b.price > a.price ORDER BY stock_code asc;
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