Sql query Group By

I have a table 'OrderBook'

it has field Oid, symbol, price, qty, buysell

开发者_如何学运维i want to sum of buy/sell price and Qty group by symbol

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  SELECT SUM(buy),
         SUM(sell),
         SUM(price),
         SUM(qty)
    FROM OrderBook
GROUP BY symbol

As you can see - SQL looks like natural language and is almost similar what you asked in the question ;-)

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I think this is a 'stock trading order book'; the table probably contains individual orders made. The 'buy/sell' column indicates whether the trade was a purchase or a sale; and it is likely that the required statistics are the sum of 'price * quantity' (the value of the sales or purchases) and maybe sum of quantity too (total volume of shares), grouped by symbol and buy/sell status. I wonder if the OID somehow identifies the date and time of the order?

If this is correct, then the aggregation should probably be:

SELECT Symbol, BuySell,
       SUM(Price * Quantity) AS Value,
       SUM(Quantity) AS Volume
  FROM OrderBook
 GROUP BY Symbol, BuySell
 ORDER BY Symbol, BuySell;

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SELECT symbol,SUM(buy),SUM(sell),SUM(qty) FROM OrderBook GROUP BY symbol

use it this way, may the query could help u upto some extend........... inside the SUM(table_field) write the field's name for which u want to get the sum.