In trading systems, SQL enables efficient data retrieval and manipulation. Users can write SQL queries to analyze market trends and execute trading strategies. The United Nations Commodity Trade Statistics Database (UN Comtrade) contains detailed imports and exports statistics reported by statistical authorities of close to 200 countries or areas. It concerns annual trade data from 1962 to the most recent year. Some traders follow something called the "10 a.m. rule." The stock market opens for trading at 9:30 a.m., and there's often a lot of trading between 9:30 a.m. and 10 a.m. Traders that follow the 10 a.m. rule think a stock's price trajectory is relatively set for the day by the end of that half-hour.
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