ON DELETE CASCADE and the CASCADE CONSTRAINTS - what are the difference?

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  Hey guys,.
  I have a question here, probably, it revolves around the UNION, INSERSECT and LESS and maybe something else I'm missing.
  
  I'm two sets of questions, and I have 2 paintings.
  

  select count(student_id) from adhoc_student_table1;
  select count(student_id) from adhoc_student_table2;
  
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  select student_id from adhoc_student_table2 order by student_id;

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  Any ideas? As always, any help is appreciated!

  Hello

  These tables do contain data and have been sorted by student_id. I want to find the difference in COUNT between the first set of SELECT and I want to find a difference in Student IDs in the second set of SELECT.
  

  Hope this helps

  select (select count(student_id) from adhoc_student_table1) -
     (select count(student_id) from adhoc_student_table2) from dual
  
  ---If you want the difference in first table not available in second table.
  
  select student_id from adhoc_student_table1 order by student_id
  minus
  select student_id from adhoc_student_table2 order by student_id
  
  -- or you wanted the difference from both table.
  with tab1 as
  (
     select student_id from
        adhoc_student_table1
  )
  tab2 as
  (
      select student_id from
  adhoc_student_table2
  )
  select * from (select student_id from tab1
                       union select student_id from tab2)
  minus
  select * from (select student_id from tab1
                      intersect select student_id from tab2)
  )
  

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  Concerning
  Anurag Tibrewal.

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  Such a compromise has become quite common these days and a couple of the reasons are because people 1) access their online resources of networks unprotected and open like those found in cafés Internet, Starbuck, or same McDonald and 2) they do not use SSL for the connection, it does not the service or because they do not realize that they should.  When using an online service such as, for example, Facebook, we should allow the security option in the profile security settings to use "https" all the time or access to the service with https:// instead of http://...  This encrypts communications and your traffic can be sniffed with common tools to steal credentials like Firesheep, a plug-in for the popular browser Firefox.  In an e-mail client, incoming and outgoing servers should also allow (or require) encrypted connections (SSL or TLS) and if they are not, you should never use an e-mail on a public network client.

  Brian Tillman [MVP-Outlook]
  --------------------------------
  https://MVP.support.Microsoft.com/profile/Brian.Tillman
  If a response may help, please vote it as useful. If a response to the problem, please mark it as an answer.

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  Hi guys... I have a doubt here that I was not able to specify the search on the internet.
  
  Is on prepared statements...
  
  When I do: con.prepareStatement (query);
  
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  Published by: user4789473 on 25-mar-2013 17:14

  If you lose / close the statement prepared, Yes, you lose the ID. If you prepare again the same
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