SELECT * FROM DUAL-> Can this statement to make the quick health check?

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  (1) I have a SELECT with a function. Ex:
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  Why «SELECT DISTINCT (SELECT function (...)» Table (FROM DUAL) "is faster than «SELECT DISTINCT function (...)» TABLE.
  
  
  Thank you
  
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  Dang, forum software is buggy course today

  I'm sorry, I'm more confused!

  Oops, now we don't want that to happen!

  OK, back to the original question: "why call a function of a scalar subquery faster?
  Answer: because the function can come from the cache and reused instead of the function running again.

  I found this explanation step by step, which should make it clear (and it has substantially the same as what I had in mind to put in place as a test of the case later tonight), take a few minutes to read this one as well:

  http://www.oratechinfo.co.UK/scalar_subqueries.html

  When you compare the unit tests for your own testcase, it is clear that:
  -using the fractions of a second to test the scalar subquery caching will give you many different results.
  -all your table column values are distinct
  Oracle knows that it is not possible to reuse a result of cache here function, given that all the results will vary and so it will re - run your function in your query for each record in your table, no caching of scalar subquery cannot be expelled.

  Hopefully this will clear your doubts for good now ;)

  About step 7 and 8: No 11.2 for me available (yet), so I can't say anything about this, sorry about that.

  Edit

  In addition, one of your previous answers was:

  When I use a function within the SELECTION, I have a SCALAR subquery caching.

  Now, this is not 100% true.
  Depends (as always), you can have it, you will not, depends on the data allowing Oracle to reuse the results of the function of cache.

  Published by: hoek on October 7, 2010 17:51

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