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------Portege
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The CHARINDEX function returns the index of the first occurrence of a string (expression1) within a second string (expression2):
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CHARINDEX(expression1, expression2 [, start_location])
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There is an optional parameter that allows you to specify the start location for the search:
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Create Procedure prSplitFullName -- split full name received in format 'Sunderic, Dejan'
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-- into last and first name -- default delimiter is comma and space ', ', -- but caller can specify other @chvFullName varchar(50), @chvDelimiter varchar(3) = ', ', @chvFirstName varchar(50) OUTPUT, @chvLastName varchar(50) OUTPUT As set nocount on declare @intPosition int Set @intPosition = CHARINDEX(@chvDelimiter, @chvFullName) If @intPosition > 0 begin Set @chvLastName = LEFT(@chvFullName, @intPosition - 1) Set @chvFirstName = RIGHT(@chvFullName, LEN(@chvFullName) - @intPosition - LEN(@chvDelimiter) ) end else return 1 return 0
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All of these string functions might look to you like a perfect tool for searching table columns, but there is just one problem with this application. If you apply a conversion function inside the Where clause of a Select statement, SQL Server does not use the index to query the table. Instead, it performs a table scan even if the index exists. For example, you should not use the CHARINDEX function to identify records with a particular string pattern:
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select * from Equipment where CHARINDEX('Portege', Model) > 0
SQL Server 2000 Stored Procedure Programming
The Like operator with wildcard characters is a much better choice if the string that you are looking for is at the beginning of the field:
select * from Equipment where Model like 'Portege%'
String Conversion The following two functions remove leading and trailing blanks from a string:
LTRIM(character_expression) RTRIM(character_expression)
In the following query, we use both of them at the same time:
select LTRIM(RTRIM(' Dejan Sunderic '))
The following functions convert a string to its uppercase or lowercase equivalent:
UPPER(character_expression) LOWER(character_expression)
Use the STR function to convert numeric values to strings:
STR(float_expression[, length[, decimal]])
The length parameter is an integer that specifies the number of characters needed for the result. This parameter includes everything: sign, digit, and decimal point. If needed, the function rounds the value and then converts it. If you do not specify a length, the default length is 10 characters, and the default decimal length is 0 (that is, the number will be converted to an integer). SQL Server provides a number of functions for converting character types:
CHAR(integer_expression) ASCII(character_expression) NCHAR(integer_expression) UNICODE(character_expression)
The CHAR and NCHAR functions return characters with the specified integer code according to the ASCII and Unicode standards:
5:
Functions
select NCHAR(352) + 'underi' + NCHAR(263)
Depending on fonts, operating systems, language settings, and other criteria, you may get proper or improper results from this expression (see Figure 5-3). There is another interesting use of the CHAR function. You can use it to insert control characters into output. For example, you can add tabulators (9) or carriage returns (13). In the past, this was a very important way to format output. The ASCII and UNICODE functions perform the opposite operation. They return the integer that corresponds to the first character of an expression (see Figure 5-4). The following two functions generate a string of a specified length (integer_expression) and fill it with spaces or a specified character:
SPACE(integer_expression) REPLICATE(character_expression, integer_expression)
Figure 5-3.
Using Unicode characters
SQL Server 2000 Stored Procedure Programming
Figure 5-4.
Identifying Unicode characters
For example
select SPACE(4) + REPLICATE('*', 8)
This statement returns a useless result, but then, these functions were used at one time primarily to format output:
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Use the STUFF function to stuff a string:
STUFF(character_expression1, start, length, character_expression2)
No, this is not meant for stuffing a turkey SQL Server removes a length of character_expression1, beginning at a specified start point, and
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Functions
replaces it with character_expression2. The specified length does not have to match that of character_expression2:
select STUFF('Sunderic, Dejan', 9, 2, Char(9))
This query replaces the comma and space in the target string with a tabulator:
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