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Built-in Function Samples
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A large number of functions are available. Microsoft has organized these functions into groups based on their definitions or functionality.
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Date and Time Functions
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A variety of functions is available when you are working with dates. New to SQL Server 2008, the SYSDATETIME, SYSDATETIMEOFFSET, and SYSUTCDATETIME functions all retrieve the current
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60 CHAPTER 1 Data Retrieval
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system time from the server, accurate to within 100 nanoseconds. Sample results are shown in Figure 1-13.
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FiGURe 1-13 Sample results for system date functions
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If you do not need the precision of these functions, the following functions return the datetime data type rather than the datetime2(7) and datetimeoffset(7) data types returned with these functions. Although the GETDATE and GETUTCDATE date functions use the same format of including parentheses after the function name, the CURRENT_TIMESTAMP function does not. The CURRENT_TIMESTAMP and GETDATE functions produce the same results. Using these less precise date and time functions can improve performance because they return a smaller data set. Figure 1-14 shows the results using these less precise functions.
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FiGURe 1-14 Results of additional, less precise date and time functions
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In addition to the functions that return the current date and time, there are functions that return date and time parts, such as DATEPART and DATENAME. The DATENAME function returns the name of the part specified, such as January for the month. In contrast, the DATEPART function returns the numeric value of the part specified. For example, 1 is returned for January. There are also functions to perform mathematical operations on dates, such as DATEADD and DATEDIFF.
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Lesson 5: Applying Built-in Scalar Functions
The DATEADD and DATEDIFF functions require a date part to be defined. A variety of keywords and symbols can be used to specify the date part. For example, a year can be specified as YEAR, YY, or YYYY. Day can be represented as DAY or DD, and so on. Figure 1-15 shows the result of several queries using date functions.
FiGURe 1-15 Queries that return date and time parts
The DATEDIFF syntax follows:
DATEDIFF (datepart, startdate, enddate)
The startdate is subtracted from the enddate. For example, if the following code was run on January 19, 2009, the result for the first query would be -8, representing that 8 year boundaries had been crossed between the start and end dates provided. The result for the second query would be -18 representing that 18 day boundaries had been crossed between the start and end dates. By reversing the start and end dates in each query, positive values are returned in the result set:
SELECT DATEDIFF(YEAR, GETDATE(), '1/1/2001') SELECT DATEDIFF(DD, GETDATE(), '1/1/2009')
More info
Date anD tiMe FUnctiOnS
For a complete list of data types and functions that are used to work with date fields, see Date and Time Data Types and Functions (Transact-SQL), in SQL Server Books Online.
Data Retrieval
System Functions
In addition to the date and time functions, system functions that manipulate the data format are commonly used. The CAST and CONVERT functions are used to convert an expression from one data type to another. The CONVERT statement can also be used to format a date. Figure 1-16 shows a number of date conversions. It is important, especially in an international organization, to understand how users interpret dates. For example, in the United States, most users would interpret the date 01/05/07 as January 5, 2007, while in France, users would interpret it as May 1, 2007, and in Japan, users would interpret it as May 7, 2001. If you do not specify a specific date format, the format is determined by whether a localized version of SQL Server is installed. When a localized version is installed, the formatting is determined by the default language configured on the computer running SQL Server.
FiGURe 1-16 Different date styles retrieved by using the CONVERT function
More info
inteRnatiOnaL cOnSiDeRatiOnS
For more information about managing international considerations, see 3.
Additional system functions are beneficial when programming and troubleshooting. The @@ERROR function returns the most recent error number in the current session, while @@TRANCOUNT returns the number of current active transactions in the current session. These functions were known as global variables in early versions of SQL Server. Unlike many of the previous samples, the syntax for these commands does not include parentheses. The @@ERROR statement must be executed immediately following the command that raised the error.
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