SQL - What is difference between SUBSTR and INSTR?

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What is difference between SUBSTR and INSTR?

SUBSTR returns a specified portion of a string eg SUBSTR('BCDEF',4) output BCDE

INSTR provides character position in which a pattern is found in a string. eg INSTR('ABC-DC-F','-',2) output 7 (2nd occurence of '-')

Total Answers and Comments: 7

Last Update: June 10, 2008

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Submitted by: ss

substr('BCDEF',4)=EF

Above answer was rated as good by the following members:
satyam_Ora, Rama Devi

July 07, 2005 11:34:04

RE: What is difference between SUBSTR and INSTR?

substr('BCDEF' 4) EF

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Overall Rating: +1

February 06, 2006 08:01:33

srinivas22338

Member Since: February 2006 Contribution: 2

RE: What is difference between SUBSTR and INSTR?...

substr gives the substring of the position we gives where as

instr gives the the character present in the particular position

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November 02, 2006 11:22:40

thumatinagaraju

RE: What is difference between SUBSTR and INSTR?...

hisubstr i s used to select pirticular word frm stringsuppose select substr('nagaraju' 1 3) from dual ;returns nag means 1 is start position of word and 3 is end ok instr returns only position of first occureence of a specified characterselect instr('nagaraju' 'a') from dual ;returns 2 only ;;ok i hope usatisfied with my answers

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January 29, 2007 03:49:21

Rohan Deshpande

RE: What is difference between SUBSTR and INSTR?...

SUBSTR: it extracts the string of determined length.whereras (i.e. it returns character for specified position)INSTR:it returns the number of named string.(i.e. it returns number )

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April 05, 2007 00:39:41

i.v.praveen

RE: What is difference between SUBSTR and INSTR?...

SUBSTR returns a character where as INSTR returns number

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August 18, 2007 07:08:00

syam sundar

RE: What is difference between SUBSTR and INSTR?...

substr:
sub(string n m): It returns the characters from nth position m
characters long
Ex:-substr(abcdefgh 3 3) it returns cde

instr:

instr(string n m):It returns the position of the nth character of the mth
occurrence.
Ex:-instr(abcadea 1 3) it returns 7

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June 10, 2008 03:22:02

ashish88

Member Since: June 2008 Contribution: 8

RE: What is difference between SUBSTR and INSTR?

hi Buddy

Substr only give the sub part of the string
Substr(String 'start postion' 'length')
Substr('ABCDEFAG' 3 7); /*out put is cdefag */

Instr to give only possion of letter in use in a string
Instr(String 'letter' possition of letter in use)
Instr('ABCDEFAB' 'a' 1 2)/* out put is 1

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