How to Efficiently Find the Last Character Index in SQL Server Without Using LastIndexOf?

Alternative way to find last character index in SQL Server

Many developers find it challenging to use the LastIndexOf function in SQL Server to extract specific characters from a string, especially when dealing with strings containing special characters. To solve this problem, let us explore some alternatives using SQL Server built-in functions.

Retrieve characters from the end of the string

In order to retrieve characters from the end of a string after a specified delimiter (e.g. "_"), you can use the following solution:

<code class="language-sql">select right(db_name(), charindex('_', reverse(db_name()) + '_') - 1)</code>

This query uses the RIGHT function to retrieve the specified number of characters from the right end of the string and CHARINDEX to determine the index of the delimiter.

Retrieve characters from the beginning of the string

Alternatively, if you need to retrieve the characters before a specific delimiter, you can use the LEFT function:

<code class="language-sql">select left(db_name(), len(db_name()) - charindex('_', reverse(db_name()) + '_'))</code>

LEFT will return the specified number of characters from the beginning of the string, while CHARINDEX again looks for the index of the delimiter.

These methods provide a more direct and readable solution for extracting characters from strings in SQL Server without the need for complex string reversal operations.

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