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"Persons", the rows are also listed. SQL Union and UNION ALL operator SQL UNION operatorThe UNION operator is used to combine the result set of two or more SELECT statements.Note that the SELECT statement inside the UNION must have the same number of columns. The column must also have a similar data type. Also, the order of the columns in each SELECT statement must be the same.SQL UNION Syntax Select column_name (s) from table_name1 UNION SELECT column_name (s) from table_name2Note: By default,

In this section we demonstrate how to use VS2010 to create a Web site built with the release MVC3. Using VS2010 to create a MVC3.0 website, you need to download the MVC3.0 installation package, which you can download on the Internet. 1. Project creation open VS2010, select File-New Project---ASP. NET MVC3 Web application, and then select Razor view, for example, click OK so that a MVC3 project is created 2 Site Publishing right-click on the project you just created, pop up a drop-down menu, choo

"Persons" table above. We can use the following SELECT statement: TOP 2* FROM PersonsResults: Id LastName FirstName Address City 1 Adams John Oxford Street London 2 Bush George Fifth Avenue New York SQL TOP PERCENT InstancesNow, we want to select 50% of the records from the "Persons" table above. We can use the following SELECT statement: TOP 50 PERCENT* FROM Persons Results:

database through the ODBC driver {Microsoft access Driver (*.mdb)} in Access, and the DBP parameter is used to specify the database file that you want to open. Because it must be the full path name, we used the Server.MapPath function on the previous statement.Name = Left (name, 40)Tel = Left (tel,10)email = left (email, 80)Subject = Left (Subject, 127)Truncate the length of the data entered into each field to avoid errors caused by the extra length of data entered into a field, but if we set t