70 461 querying microsoft sql server 2012

Microsoft SQL Server Each version will have a corresponding sample project, from the 2000 FoodMart to 2005 after the Adventure Works, inside the design methods and specifications have a lot of things we deserve to learn. Not only do ordinary development, if you do BI development then you will find that this is a good guide, and

to the SSAS server, and then look at the accuracy of the algorithm for the current mining model, the exact rate of the mining model we built in this example is only 16.67% very low, and one important reason is that we are using too little data for data training. This number can be significantly improved after the amount of data trained is increased.Finally, we can call DMX statements on the built mining model to do the data prediction, we use the gra

Server in a previous version of SQL Server, the view is not indexed, so the view is generally useless, in addition to occasionally use it to do some authority management to Outside Querying a view and using a connection statement is no different in execution efficiency. However, in the new century,

, 1753 to December 31, 9999, the accuracy is 3.33 milliseconds. 8 bytes DateTime2 From January 1, 1753 to December 31, 9999, the accuracy is 100 nanoseconds. 6-8 bytes smalldatetime From January 1, 1900 to June 6, 2079, the accuracy is 1 minutes. 4 bytes Date Only dates are stored. From January 1, 01 to December 31, 9999. 3 bytes Time Storage time only. The accuracy is 100 nanoseconds. 3-5 by