WE SHOULD NOT USE SUBSTR FUNCTION...

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• Help on using substr and instr functions

  Hello
  
  I'm trying to go back to the first three letters of the first word and all the last word in a description field. For example, if the description is 'grilled steak' the query should return "steak gri. That's what I have so far:
  
  SELECT SUPPLIER_ID, PRODUCT_CODE, SUBSTR (DESCRIPTION, 1, 3). ' ' || SUBSTR (DESCRIPTION, INSTR (DESCRIPTION, ' ', 3)) AS A DESCRIPTION
  OF L_FOODS;
  
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  Hi and welcome to the forum!

  It is always helpful if you identify your version of Oracle. The solution below depends on 10.1 and upward.

  What you could do is include a conditional around your instr/substr functions that checks the number of spaces between words. If it is greater or equal two one then there are at least two words. For example:

  WITH test_data AS
  (
       SELECT 'grilled steak' AS DESCRIPTION FROM DUAL UNION ALL
       SELECT 'large pepperoni pizza' AS DESCRIPTION FROM DUAL UNION ALL
       SELECT 'soda' AS DESCRIPTION FROM DUAL
  )
  SELECT     (CASE
            WHEN LENGTH(REGEXP_REPLACE(TRIM(DESCRIPTION),'[^[:space:]]','')) > 0
            THEN SUBSTR(DESCRIPTION,1,3) || SUBSTR(DESCRIPTION,INSTR(DESCRIPTION,' ',-1))
            ELSE SUBSTR(DESCRIPTION,1,3)
       END) AS DESCRIPTION
  FROM     test_data
  

  Results

  SQL> /
  
  DESCRIPTION
  -----------------------
  gri steak
  lar pizza
  sod
  

  : EDITION:

  I also wanted to add this:

  SUBSTR(DESCRIPTION, INSTR(DESCRIPTION, ' ', 3))
  

  May not return the expected results. If your description field contains more than two words he will return all remaining words not only the LAST Word. See my solution above for what I believe is the correct version.

  HTH!

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  Best regards, Dave.