What does "<>" mean in Oracle

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What does <> mean in SQL language: Sample code is as follows

SELECT ordid,
       prodid,
       qty
FROM   item
WHERE  prodid IN (SELECT prodid
                  FROM   item
                  WHERE  ordid = 605)
       AND qty IN (SELECT qty
                   FROM   item
                   WHERE  ordid = 605)
       AND ordid <> 605;  

It means 'not equal to'. So you're filtering out records where ordid is 605. Overall you're looking for any records which have the same prodid and qty values as those assigned to ordid 605, but which are for a different order.

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Does not equal. The opposite of =, equivalent to !=.

Also, for everyone's info, this can return a non-zero number of rows. I see the OP has reformatted his question so it's a bit clearer, but as far as I can tell, this finds records where product ID is among those found in order #605, as is quantity, but it's not actually order #605. If order #605 contains 1 apple, 2 bananas and 3 crayons, #604 should match if it contains 2 apples (but not 3 dogs). It just won't match order #605. (And if ordid is unique, then it would find exact duplicates.)

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It just means "different of", some languages uses !=, others (like SQL) <>

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not equals. See here for a list of conditions

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I'm surprised nobody mentioned the null special case. I think the meaning of <> is more something like

has a value which is not equal to

In this case it filters out items which have ordid 605 and items which have a null ordid.

It may be obvious in this context that ordid is never null, but it is never hurts to remember that null is not <> from 605 (or from anything).

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Comments
  • Welcome! If you've an answer to your problem, click the outline tick next to the correct solution. There's no need to edit your post.
  • Sure =) Sorry about that. I am new
  • @Jay - I deleted my answer as I had misread the query originally. The conditions aren't contradictory at all. Somewhat clearer with the reformatted query!
  • No worries Martin, sorry about that. The answer we are given is "Display the order number, product number, and quantity of any item in which the product number and quantity match any product number and any quantity of an item in order 605." Although I am still little confused
  • @MartinSmith Also I was wondering if you have any resources that have all the conditions and operators that can help me revise?
  • This question is for Oracle.
  • Also is general SQL, nothing to do with php