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Millisecond Second Minute Hour weekday Week dayofyear Day Month Quarter Year Table 5-2
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ms ss, s mi, n hh dw wk, ww dy, y dd, d mm, m qq, q yy, yyyy
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Notice that the first parameter is not a character parameter. You cannot fill it using an expression or variable. SQL Server will return:
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Date Month Name Year -------------------------- --------------- ----------2003-02-20 00:45:40.867 February 2003
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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() is used to add a number of datepart intervals to the 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 uses these functions to list the due dates for leases:
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) 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)
5: Functions
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) 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
You can see the result of the stored procedure in Figure 5-2.
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Figure 5-2
Execution prListTerms
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 The Len() function uses the following syntax:
Len(string_expression)
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)
The result is
----------22
5: Functions
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) Early 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
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 returns 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 data type. Because of this data type flexibility, the length and start parameters are based on the number of bytes when the expression is of the text, image, binary, or varbinary data types, rather than on the number of characters. In the case of Unicode data types, one character occupies 2 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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