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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' -- 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
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The Like operator with wild card characters is a much better choice if the string that you are looking for is at the beginning of the field:
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select * from Equipment where Model like 'Portege%'
5: Functions
The PatIndex() function is similar to the CharIndex() function:
PatIndex('%pattern%', expression)
The major difference is that it allows the use of wild card characters in the search pattern:
Set @intPosition = PATINDEX('%,%', @chvFullName)
Again, if you use this function to search against a table column, SQL Server ignores the index and performs a table scan.
In earlier versions of SQL Server, PatIndex() was the only reasonable (although not very fast) way to query the contents of text columns and variables. Since version 7.0, SQL Server has had a new feature Full-Text Search that allows linguistic searches against all character data and works with words and phrases instead of with character patterns. Basically, Microsoft has included Index Server in the Standard and Enterprise editions of SQL Server 7.0 and 2000.
String Conversion from a string: The following two functions remove leading and trailing blanks
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 necessary to fit the output into the specified length, SQL Server will round the value before converting it. If you do not specify a length, the default length is ten characters, and the default decimal length is 0.
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SQL Server provides a number of functions for representing the conversion from character types to ASCII codes and vice versa:
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:
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 Char(9) or carriage returns Char(13). In the past, this was a very important way to format output.
Figure 5-3
Using Unicode characters
5: Functions
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)
For example:
select Space(4) + Replicate('*', 8)
This statement returns a useless result, but these functions were used at one time primarily to format output:
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Figure 5-4
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