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The CHARINDEX function returns the index of the first occurrence of a string (expression1) within a second string (expression2):

CHARINDEX(expression1, expression2 [, start_location])

There is an optional parameter that allows you to specify the start location for the search:

Create Procedure prSplitFullName -- split full name received in format 'Sunderic, Dejan'

5:

-- 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

It s not that programs need a valid comment from the developer. The appinfo annotations simply do not have any meaning for the schema validator, while they might be very important instructions for target programs.

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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:

The transaction manager delineates the boundaries of statements that must be grouped together to form an operation. It handles transactions that cross databases within the same SQL Server, and it allows nested transaction sequences. (However, nested transactions simply execute in the context of the first-level transaction; no special action occurs when they are committed. And a rollback specified in a lower level of a nested transaction undoes the entire transaction.) For a distributed transaction to another SQL Server (or to any other resource manager), the transaction manager coordinates with the Microsoft Distributed Transaction Coordinator (MS DTC) service using operating system remote procedure calls. The transaction manager marks savepoints, which let you designate points within a transaction at which work can be partially rolled back or undone. The transaction manager also coordinates with the lock manager regarding when locks can be released, based on the isolation level in effect. The isolation level in which your transaction runs determines how sensitive your application is to changes made by others and consequently how long your transaction must hold locks to protect against such changes. Four isolation-level semantics are available in SQL Server 2000: Uncommitted Read (also called dirty read ), Committed Read, Repeatable Read, and Serializable. Your transactions behavior depends on the isolation level. We will look at these levels now, but a complete understanding of isolation levels also requires an understanding of locking, because the topics are so closely related. The next section gives an overview of locking.

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:

<xsd:annotation> <xsd:documentation xml:lang="en-US"> This element should be linked with Location.LocId. </xsd:documentation> <xsd:appinfo> <TbSql proc="Location.LocId">Link</TbSql> </xsd:appinfo> <xsd:/annotation>

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:

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