Left: This function use when we want to select a left part of the character string with the specified number of characters.
LEFT ( character_expression , integer_expression )
character_expression: Character expression is the expression of character or binary data, except text or ntext, character_expression can be of any data type.
integer_expression: integer_expression is a positive integer that specifies how many characters of the character_expression will be returned.
DECLARE @str VARCHAR(60)
SET @str='dilip Kumar Singh'
select Left(@str,5) AS LeftFiveChar