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CHAPTER 5 CREATING QUERIES FROM A SINGLE DATABASE OBJECT
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The DATEADD function adds an interval to a base datetime value. This function applies to dates and times within datetime values. The interval can be one of 11 durations from a number of milliseconds to a number of years. Each interval type has one or two abbreviations for use with the DATEADD function, such as yyyy for year, m for month, and ms for millisecond. The DATEADD function takes three parameters. 1. The first parameter is most often an abbreviation for the type of interval. You can optionally use the full name for a part of a date, such as Month instead of m. 2. The second parameter is an integer value denoting the number of interval units to apply to the base datetime value to compute a new datetime value. You can use smalldatetime values as well as datetime values. A positive parameter value rolls time forward, and a negative parameter value rolls time backward. A noninteger value results in the fractional part of the value being discarded. 3. The third parameter is the base datetime value. You can specify the datetime value with either a datetime or smalldatetime data type. The DATEDIFF function computes the difference between two datetime or smalldatetime values. You can request the computation of the difference in any of 10 different time intervals, such as year, day, or millisecond. This function can be particularly useful for documenting the performance differences for two or more different ways of performing the same task. The DATEDIFF function takes three parameters. 1. The initial parameter designates the date or time unit in which to compute a difference. 2. The second parameter is the starting date and time. 3. The third parameter is the ending date and time. DECLARE @thisdate datetime, @nextmonth datetime SET @thisdate = GETDATE() SET @nextmonth = DATEADD(m, 1, GETDATE()) SELECT CONVERT(varchar, @thisdate, 101) 'Today', CONVERT(varchar, @nextmonth, 101) 'One month from today', DATEDIFF(d, @thisdate, @nextmonth) 'Days between' Today One month from today Days between ------------------------------ -------------------- -----------04/17/2005 05/17/2005 30
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Using the Current Database Context or a Different Database
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When specifying a FROM clause for a single data source, SQL Server Express looks for the data source in the current database context, unless you explicitly indicate otherwise by, for example, using a three-part name to designate a table in another database on the same server as the database context. You can use a four-part name to reference a table in another database on a different server from the one to which the database context refers. Data sources are typically either tables or views. This section highlights techniques for running queries from a single database either from the current database context or from another database on the same SQL Server instance. The samples for this section appear in CurrentDatabaseOrDifferentDatabase.sql.
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CHAPTER 5 CREATING QUERIES FROM A SINGLE DATABASE OBJECT
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SQL Server Express always internally tracks data sources by a unique four-part name. Depending on database context for a query statement and the data source that you want a query statement to reference, you can often specify less than four name parts. The full name for a database object serving as a data source is server_name.database_name.schema_name.object_name. You can omit the server_name qualifier for an object when referencing it on the same server as the database context. Using name parts can be tricky in the abstract, but designating the appropriate name parts is straightforward in actual practice just be sure to include enough name parts to uniquely identify an object. Therefore, this book refers to name parts as needed when dealing with contexts that highlight their roles.
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Running Queries from the Current Database Context or a Different Database
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The following script contrasts the syntax for referencing a data source from the current database context versus from another database. A USE statement sets the database context to AdventureWorks on the server for the connection to a SQL Server Express instance. The first SELECT statement looks for the SalesOrderHeader table in the Sales schema within the AdventureWorks database. The FROM clause uses a two-part name, for which the top part designates a schema in the current database context, and the nested second part references a table. On the other hand, the reference to the Northwind database uses a three-part name. The top part references the database name. Nested immediately below the database name is the schema name dbo. The bottom part is the table name (Orders). USE AdventureWorks GO SELECT TOP 5 SalesOrderID 'Order ID', CONVERT(varchar,OrderDate,101) 'Order date' FROM Sales.SalesOrderHeader SELECT TOP 5 OrderID 'Order ID', CONVERT(varchar,OrderDate,101) 'Order date' FROM Northwind.dbo.Orders The following listing shows the output from the preceding script. The top five rows are from the SalesOrderHeader table in the AdventureWorks database. The second five rows are from the Orders table in the Northwind database. Order ID ----------43659 43660 43661 43662 43663 Order date ---------07/01/2001 07/01/2001 07/01/2001 07/01/2001 07/01/2001
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(5 row(s) affected)
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Order ID ----------10248 10249
Order date ---------07/04/1996 07/05/1996
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