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Functions can be used inside Check and Default constraints:
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CREATE TABLE [dbo].[Order] ( [OrderId] [int] IDENTITY (1, 1) NOT NULL , [OrderDate] [smalldatetime] NOT NULL , [RequestedById] [int] NOT NULL , [TargetDate] [smalldatetime] NOT NULL , [CompletionDate] [smalldatetime] NULL , [DestinationLocationId] [int] NULL ) ON [PRIMARY]
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ALTER TABLE [dbo].[Order] WITH NOCHECK ADD CONSTRAINT [DF_Order_OrderDate] DEFAULT (GETDATE()) FOR [OrderDate], CONSTRAINT [PK_Order] PRIMARY KEY ( [OrderId] ) GO ON [PRIMARY] CLUSTERED
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In this case, the Order table automatically sets the OrderDate field to the current date if the user omits to supply its value.
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Since SQL Server 2000 has a new table datatype, it is also possible for a function to return a recordset. Microsoft documentation refers to such functions as table-valued functions. These functions can be used
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in situations in TSQL where tables are expected. In the following example, the result of the function is used to join with another table (EqType) to produce a new resultset:
Select * from dbo.NewEquipment(DATEADD(month, -1, GetDate()) NewEq inner join EqType on NewEq.EqTypeId = EqType.EqTypeId
To reference a table-valued function, you must specify the object owner along with the function name (owner.function). The only exception to this rule is in the use of built-in table-valued functions. In this case, you must place two colons (::) in front of the function name. For example, the fn_EXTENDEDPROPERTY function lists properties of the database object (see Figure 5-1). For more details about extended properties, refer to 10.
Figure 5-1.
Using table-valued user-defined functions
SQL Server 2000 Stored Procedure Programming
TYPES OF FUNCTIONS
Depending on the way that functions are created, functions in SQL Server 2000 can be divided into two groups:
Built-in User-defined
Built-in functions are delivered as a part of the Transact-SQL language. They are implemented as part of SQL Server. User-defined functions allow users to define their own Transact-SQL functions. Users can design them by combining other Transact-SQL statements. Unfortunately, SQL Server 7.0 does not support user-defined functions. We will examine the details of the design of user-defined functions in 9. We can identify three major groups of functions according to the result that is returned:
w s v
Scalar Rowset Aggregate
Scalar Functions
Most of the time when we refer to functions, we are thinking of the scalar type. The name of this type refers to the fact that these functions return only one value. Considering their functionality but not necessarily their return values, we can divide scalar functions into the following groups:
w s s s s s
System Date and time String Mathematical Metadata Security
5:
Functions
s s s v
Text and image Cursor Configuration System statistical
We will not be able to cover in detail all functions defined in Microsoft SQL Server. We will simply discuss the most important of them. You can find complete documentation of all functions in SQL Server Books Online.
System Functions
System functions return information related to the Microsoft SQL Server environment. They are used to return object names and identifiers, current user, current database, session, application, and login; to investigate the datatype of an expression; and to perform conversions between datatypes. Let s examine some of the most important system functions and look at some examples. Conditional Expression CASE In other programming languages, CASE is usually a flow-control programming construct. In earlier versions of SQL Server documentation, CASE is usually classified as an expression. Since SQL Server 7.0, it is classified as a function, which is mathematically more correct. However, all of these classifications are more or less true. The CASE function/expression enables the user to evaluate an expression and to return the value associated with the result of the expression. For example, the CASE function/expression in the following stored procedure returns the approximate number of days associated with a leasing schedule:
Create Procedure prLeasePeriodDuration -- return approximate number of days associated with lease frequency @inyScheduleFrequencyId tinyint, @insDays smallint OUTPUT As Declare @chvScheduleFrequency varchar(50)
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