If length is zero, insertion occurs at start location and no characters are deleted. 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. Is an integer that specifies the number of characters to delete. If start is longer than the first character_expression, a null string is returned. If start is negative or zero, a null string is returned. Is an integer value that specifies the location to start deletion and insertion. character_expression can be a constant, variable, or column of either character or binary data. To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation.
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