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Dateparts and Abbreviations Recognized by SQL Server
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SQL Server 2000 Stored Procedure Programming
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DATEPART will then return the index value of the datepart, and DATENAME will return the string that contains the appropriate name. Naturally, DATENAME is not meaningful in some cases (for example, year, second) and SQL Server will return the same number as it does for DATEPART.
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SELECT GETDATE(), DATENAME(month, GetDate()) AS 'Month Name', DATEPART(yyyy, GetDate()) AS 'Year'
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Notice that the first parameter is not a character parameter. You cannot fill it using an expression or variable. Date and Time Calculations Transact-SQL contains two functions for performing calculations on date and time expressions:
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DATEADD(datepart, number, date) DATEDIFF(datepart, startdate, enddate)
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DATEADD can be used to add a number of datepart intervals to a specified date value. DATEDIFF returns the number of datepart intervals between a startdate and an enddate. Both of these functions use a value from Table 5-2, shown in the previous section, to specify datepart. The following stored procedure lists due dates for the lease:
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Alter Procedure prListTerms -- return list of due days for the leasing @dtsStartDate smalldatetime, @dtsEndDate smalldatetime, @chvLeaseFrequency varchar(20) As set nocount on declare @insDueDates smallint -- number of intervals -- calculate number of DueDates select @insDueDates = CASE @chvLeaseFrequency When 'monthly' then DATEDIFF(month, @dtsStartDate, @dtsEndDate)
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Functions
When 'semi-monthly' then 2 * DATEDIFF(month, @dtsStartDate, @dtsEndDate) When 'bi-weekly' then DATEDIFF(week, @dtsStartDate, @dtsEndDate)/2 When 'weekly' then DATEDIFF(week, @dtsStartDate, @dtsEndDate) When 'quarterly' then DATEDIFF(qq, @dtsStartDate, @dtsEndDate) When 'yearly' then DATEDIFF(y, @dtsStartDate, @dtsEndDate) END -- generate list of due dates using temporary table Create table #DueDates (ID int) while @insDueDates >= 0 begin insert #DueDates (ID) values (@insDueDates) select @insDueDates = @insDueDates - 1 end -- display list of Due dates select ID+1, Convert(varchar, CASE When @chvLeaseFrequency = 'monthly' then DATEADD(month,ID, @dtsStartDate) When @chvLeaseFrequency = 'semi-monthly' and ID/2 = CAST(ID as float)/2 then DATEADD(month, ID/2, @dtsStartDate) When @chvLeaseFrequency = 'semi-monthly' and ID/2 <> CAST(ID as float)/2 then DATEADD(dd, 15, DATEADD(month, ID/2, @dtsStartDate)) When @chvLeaseFrequency = 'bi-weekly' then DATEADD(week, ID*2, @dtsStartDate)
SQL Server 2000 Stored Procedure Programming
When @chvLeaseFrequency = 'weekly' then DATEADD(week, ID, @dtsStartDate) When @chvLeaseFrequency = 'quarterly' then DATEADD(qq, ID, @dtsStartDate) When @chvLeaseFrequency = 'yearly' then DATEADD(y, ID, @dtsStartDate) END , 105) [Due date] from #DueDates order by ID -- wash the dishes drop table #DueDates return 0
TIP: Execute and investigate carefully this stored procedure (see Figure 5-2). Or even better, try to create it yourself. You will learn a lot from the problems that you encounter.
String Functions
Microsoft SQL Server supports an elaborate set of string functions. (Who would expect such a thing from a tool developed in C ;)) Basic String Manipulation
LEN(string_expression)
The LEN function uses the following syntax:
This function returns the length of a string in characters. The input parameter can be any kind of string expression. DATALENGTH, a similar system function, returns the number of bytes occupied by the value.
declare @chvEquipment varchar(30) set @chvEquipment = 'Toshiba Portege 7020CT' select Len(@chvEquipment)
5:
Functions
Figure 5-2.
Executing prListTerms
The result is
-----------
The following two functions return the number of characters from the left or right side of the string: LEFT(character_expression, integer_expression) RIGHT(character_expression, integer_expression) Earlier versions of Microsoft SQL Server contained only the RIGHT function.
declare @chvEquipment varchar(30) set @chvEquipment = 'Toshiba Portege 7020CT' select Left(@chvEquipment, 7) Make, Right(@chvEquipment, 14) Model
SQL Server 2000 Stored Procedure Programming
The result of this batch is
Make Model ------- -------------Toshiba Portege 7020CT
Before the introduction of the LEFT function, developers had to implement its functionality using the SUBSTRING function:
SUBSTRING(expression, start, length)
The SUBSTRING function takes a set (length) of characters from the string (expression) starting from a specified (start) character. The expression can be any character, text, image, or binary datatype. Because of this datatype flexibility, the length and start parameters are based on the number of bytes when the expression is of the text, image, binary, or varbinary datatypes, rather than on the number of characters. In the case of Unicode datatypes, one character occupies two bytes. If you specify an odd number, you may get unexpected results in the form of split characters. The following batch extracts part of a string:
declare @chvEquipment varchar(30) set @chvEquipment = 'Toshiba Portege 7020CT' select SUBSTRING(@chvEquipment, 9, 7)
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