Deletes a specified length of characters and inserts another set of characters at a specified starting point.
STUFF (character_expression, start, length, character_expression )
Arguments
character_expression
An expression that can be implicitly converted to nvarcharor ntext.start
An integer value or an expression that can be implicitly converted to int, which specifies the location to begin deletion and insertion. If start is negative, a null string is returned. If start is longer than the first character_expression, a null string is returned.length
An integer or an expression that can be implicitly converted to int, which specifies the number of characters to delete. If length is longer than the first character_expression, deletion occurs up to the last character in the last character_expression. If length is negative, a null string is returned.
nvarchar or ntext
Example
The following example deletes the second digit of the product ID in the Productstable and replaces it with the characters '000'.
SELECT STUFF([Product ID], 2,1, '000')
FROM Products