The company charges a subscription fee for accessing its tools. The productivity suite is available to commercial partners on license and personal users. The software has the goal of improving personal and corporate productivity and communications. Microsoft offers a productivity software suite to businesses and private users (Microsoft Office). The company's largest revenue source is its cloud computing business, and it's the fastest-growing segment of its business model. Microsoft makes money by selling digital devices, operating systems, productivity tools, cloud services, and gaming platforms to the consumer and corporate markets. Microsoft introduced its range of 'Surface' tablets in 2012. Microsoft retains its market-leading position in the consumer and business segments of PC operating systems, online gaming, and productivity software. Ray Ozzie left the company in 2010, and Ballmer retired in 2014, leaving current CEO Satya Nadella to run the company. Gates remains chairman of the board, but he has not had a direct role in company operations since 2006. He nominated Ray Ozzie as the chief software architect in 2006. Gates handed over the reins to Steve Ballmer, who he met during his tenure at Harvard University in the 1970s. How does Microsoft work?īill Gates stepped down from his role as the company's CEO in 2000. Microsoft operates R&D labs at other global locations in Cambridge, England Beijing, China Bengaluru, India Cambridge, Massachusetts New York, New York and Montreal, Canada. The company has sales offices around the globe, and it operates an R&D center at its corporate headquarters, based in Redmond, Washington. The company offers email services, and it owns the 'Xbox' gaming platform. The company publishes multimedia titles and manufactures a range of hybrid tablet devices, laptops, and smartphones. Included in the result set per the holding_value_stamps2.The Microsoft Corporation is a leading developer of PC software operating systems and apps. Holding_value_stamps2.id would be NULL (which in turn causes them to be Would not join to any actual data from holding_value_stamps2, and No record with a created_at that is greater than their own. ON clause for the OUTER JOIN for either of the two records, i.e. This is because there are no other records to satisfy the This solution has the same issue when multiple records have the sameĬreated_at that we discussed earlier, both of those records would find their When a row in holding_value_stamps2 (the same table) exists with a more recent Here we ensure that we are not selecting any rows from holding_value_stamps1 * FROM ( SELECT holding_id, holding_type, MAX ( created_at ) as created_at FROM holding_value_stamps GROUP BY holding_id, holding_type ) AS most_recent_stamps INNER JOIN holding_value_stamps ON holding_value_stamps. This point only StockHoldings and BondHoldings) that belongs to the user. To do this we need the most recent HoldingValueStamps for each holding (at We also need to be able to tell the user the current value of their portfolio. SQL sub-select multiple columns with INNER JOIN Our users a trend-line of their portfolio’s value overtime. Having these stamps would also allow us to show These stamps are created to keep an historical record of the HoldingValueStamp will be how we track their value.Įvery minute, we’ll create a HoldingValueStamp with the current value of yourġ0 shares of AAPL. The value of those AAPL shares wouldįluctuate over time. You bought 10 shares of AAPL, we would create a StockHolding for you withĬompany_id: 'AAPL', quantity: 10. Here StockHolding and BondHolding represent ownership of stock and bonds. HoldingValueStamps: [ user_id, holding_id, holding_type, value,.BondHoldings: [ id, user_id, company_id, purchase_price, par_value,.This strategy can be expanded for any number of similar situations, even those

This situation you’d really just want to pick one of the two and adding aĭISTINCT clause on user_id in the above example would do just that. A larger one if you are doing something user-facing. A small one if you areĭisplaying the latest orders to the admins of your application (they see two The upshot is that this query would includeĢ entries for that user. In the case of users making orders, it’s pretty unlikely short of a double-submitīug, but depending on your use-case for the table in question and the scale of What if two orders have the same datetime (specifically the most recent)? One caveat: there’s a slight issue with using a datetime as an identifier here. Return only the subset of user_ids paired with their most recent order this The orders that match the user_id and the created_at timestamp of the created_atĪlright, this is slightly less intuitive. * FROM ( SELECT user_id, MAX ( created_at ) AS created_at FROM orders GROUP BY user_id ) AS latest_orders INNER JOIN orders ON orders.

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