Microsoft SQL Server Tutorial => Replace

Example

Returns a string (varchar or nvarchar) where all occurrences of a specified sub string is replaced with another sub string.

Parameters:

string expression. This is the string that would be searched. It can be a character or binary data type.
pattern. This is the sub string that would be replaced. It can be a character or binary data type. The pattern argument cannot be an empty string.
replacement. This is the sub string that would replace the pattern sub string. It can be a character or binary data.

SELECT REPLACE('This is my string', 'is', 'XX') -- Returns 'ThXX XX my string'.

Notes:

If string expression is not of type varchar(max) or nvarchar(max), the replace function truncates the return value at 8,000 chars.
Return data type depends on input data types - returns nvarchar if one of the input values is nvarchar, or varchar otherwise.
Return NULL if any of the input parameters is NULL

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