Answer Posted / tulsi
SUBSTR is used to extract a set of characters from a string
by specificing the character starting position and end
position and length of characters to be fetched.
example substr('hello',2,3) will return 'ell'
INSTR is used to find the position of any particular
character in a word which returns numeric value.
instr('hello','e') - will return the position of 'e' as 2
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