STUFF and REPLACE.

STUFF (character expression, start, length, character expression)

Eg: SELECT STUFF('ABCDEF', 2, 3, 'JKLMN')

ResultSet
AJKLMNEF

What this STUFF Function will do is
1)Checks First two characters in the Character Expression(‘ABCDEF’)
2)Those two characters are BC in the Character Expression.
3)This starts count from B to D (Total Count 3)
4)So it removes BCD and Place JKLMN in that place.
5)So result set appears as AJKLMNEF


REPLACE:
REPLACE will also do the same with the Different way.

REPLACE (string_expression1, string_expression2, string_expression3)
Eg: SELECT REPLACE('ABCDEF','BCD','JKLMN')
ResultSet:
AJKLMNEF

The way REPLACE Works is:
1)First it checks for the BCD in ABCDEF
2)And Remove BCD and Place JKLMN in the place of BCD
3)So output look like as AJKLMNEF

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