ORDER BY RAND() with EclipseLink?

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• Order by date with a format mask column

  10g - 10.2.0
  
  Hello
  
  This is my request
  

  select to_char(exp_Date,'Mon-YYYY') dt, count(*) from exp_main
  where exp_type like 'Income%Photo%'
  group by to_char(exp_Date,'Mon-YYYY')
  order by exp_date
  
   

  When I run this I get: not a GROUP BY expression
  
  If I remove the order by, it works fine.
  
  Is it possible to order by since the output of the query is sorted character.
  
  I search online most suggested to use the order of column_name. But does not work for me.
  
  Thank you!
  Ryan

  Hello

  Keep the date information as a DATE, with the exception (if required) for display. That means that GROUP BY and ORDER BY DATE, not a string:

  SELECT    TO_CHAR ( TRUNC (exp_Date, 'MONTH')
                , 'Mon-YYYY'
              )          AS dt
  ,       COUNT (*)           AS cnt
  FROM        exp_main
  WHERE        exp_type     LIKE 'Income%Photo%'
  GROUP BY  TRUNC (exp_Date, 'MONTH')
  ORDER BY  TRUNC (exp_date, 'MONTH')
  ;
  

• How to order by working with rownum

  Oracle worm: 11g
  
  Hi all
  I have 2 cases here, with external control by one and another without external by command.
  I see no difference in the results for the moment.
  Case 1:

  /* Formatted on 4/30/2013 2:12:28 PM (QP5 v5.240.12305.39446) */
  SELECT *
    FROM (  SELECT ROWNUM rn, id
              FROM (SELECT 9 AS id FROM DUAL
                    UNION ALL
                    SELECT 1 FROM DUAL
                    UNION ALL
                    SELECT 14 FROM DUAL
                    UNION ALL
                    SELECT 7 FROM DUAL
                    UNION ALL
                    SELECT 5 FROM DUAL
                    UNION ALL
                    SELECT 6 FROM DUAL
                    UNION ALL
                    SELECT 13 FROM DUAL
                    UNION ALL
                    SELECT 8 FROM DUAL
                    UNION ALL
                    SELECT 2 FROM DUAL
                    UNION ALL
                    SELECT 4 FROM DUAL
                    UNION ALL
                    SELECT 19 FROM DUAL
                    UNION ALL
                    SELECT 3 FROM DUAL)
          ORDER BY id)
   WHERE rn BETWEEN 1 AND 6;
   

  Case 2:
  I added the command by external clause in this case
  But I want to make sure if I really need to have the order of outer query by here.

  /* Formatted on 4/30/2013 2:12:28 PM (QP5 v5.240.12305.39446) */
  SELECT *
    FROM (  SELECT ROWNUM rn, id
              FROM (SELECT 9 AS id FROM DUAL
                    UNION ALL
                    SELECT 1 FROM DUAL
                    UNION ALL
                    SELECT 14 FROM DUAL
                    UNION ALL
                    SELECT 7 FROM DUAL
                    UNION ALL
                    SELECT 5 FROM DUAL
                    UNION ALL
                    SELECT 6 FROM DUAL
                    UNION ALL
                    SELECT 13 FROM DUAL
                    UNION ALL
                    SELECT 8 FROM DUAL
                    UNION ALL
                    SELECT 2 FROM DUAL
                    UNION ALL
                    SELECT 4 FROM DUAL
                    UNION ALL
                    SELECT 19 FROM DUAL
                    UNION ALL
                    SELECT 3 FROM DUAL)
          ORDER BY id)
   WHERE rn BETWEEN 1 AND 6;
   ORDER BY id;

  Thank you
  Rod.

  Hey, Rod,

  SamFisher wrote:
  ... I see no difference in the results for the moment.

  You can not, but you are not sure that you will never see a difference. There may be a difference if you change versions, or if you add more data, or for no apparent reason.

  If there is an ORDER BY clause in the main query (as in query 2) then the output is guaranteed to be in that order.
  Is there no ORDER BY clause in the main query (as in the query 1), then there is no guarantee that the lines will be in a particular order. If Oracle finds it convenient to display rows in order by one of the columns (for example, rn) then she will do. You can't count on it always does the same thing, unless there is an ORDER BY clause.

  You should check the ROW_NUMBER analytic function. It is much more useful and easier to understand, as ROWNUM. (In this example, it maybe not simple, however.)

• ORDER BY clause with an expression

  As the column of names and table name is valid, what happening internally when the query is executed?
  
  SQL > SELECT STU_ID, STU_NAME FROM to STUDENT BY 2 + 3, STU_ID;
  
  What I discovered, was that the lines get sorted by ascending order of STU_ID. It is obvious that he does not know the expression 2 + 3, so my doubts are:
  
  (a) is he adding a pseudo-column to the table with 2 + 3 get discounted at 5?
  
  Select (b) if there is a 5th column among students of the table and specify us it in the select statement of the list (5 column names) then why not consider as 5 and sort the data according to that?
  
  (c) it is true that, any expression that we write is getting evaluated to null? Then - what is ORDER BY NULL refers to any order and if the Analyzer search name column or next position (if specified)?
  
  (d) If neither of the two, so what is the reason of ignorance?

  Hello

  Welcome to the forum!

  987236 wrote:
  As the column of names and table name is valid, what happening internally when the query is executed?

  SQL > SELECT STU_ID, STU_NAME FROM TO STUDENT BY 2 + 3, STU_ID;

  What I discovered, was that the lines get sorted by ascending order of STU_ID. It is obvious that he does not know the expression 2 + 3, so my doubts are:

  b is a pseudo-column adding to the table with 2 + 3 get discounted at 5

  There is no column pseduo involved. (Pseudo-colonnes are something that Oracle provides to you, without requiring you to specify what you want. Include ROWID and LEVEL pseudo-colonnes. In this example, 2 + 3 is an Expression . Like the pseudo-colonnes, expressions can usually appear in the ORDER BY clause, even if they are not actually stored in the table.)
  It is the first sort by the NUMBER 5 (= 2 + 3), not the 5th column. Since the NUMBER 5 has the same value on every row, every row relates to the forefront. The result of sorting by any constant is the same; the results are the same that besides as exrpression in the ORDER BY clause. This is the clause ORDER BY, that you have published is equivalent to

  ORDER BY  2 + 3
  ,         'foo'
  ,         SYSDATE
  ,         NULL
  ,         stu_id
  

  and this is also equivalent to

  ORDER BY  stu_id
  

  None of the expressions except stu_id vary from one line to the other, then none of them affect sorting.

  Select (b) if there is a 5th column among students of the table and specify us it in the select statement of the list (5 column names) then why not consider as 5 and sort the data according to that?

  As Solomon replied only literal numbers are taken to refer to a column. 5 is a literal number, then

  ORDER BY  5
  

  means "Sort by the 5th column", but 2 + 3 is not a literal (that is an expression that happens to include a couple of literals), so

  ORDER BY  2 + 3
  

  does not refer to the 5th colunmn.

  (c) it is true that, any expression that we write is getting evaluated to null? Then - what is ORDER BY NULL refers to any order and if the Analyzer search name column or next position (if specified)?

  No, when you way "ORDER BY x", the rows with values of x which come first, followed by the lines with higher values of x. lines having the same value of x will be together, in no particular order with respect to the other (unless there is an expression of failure later in the clause ORDER BY.
  This is exactly what happens when you say "ORDER BY NULL". NULL has the same value (in fact, the same lack of any value) on all lines, so all rows have the same value of x, and they will appear in no particular order.

  (d) If neither of the two, so what is the reason of ignorance?

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  I'm finally ready to order my T61p of the Canada.

  But as I entered the site and customize my new laptop, I realized that I can't not find the bluetooth option in the menu, although I remmember before light.

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• Order of operations with parentheses

  I have a query which returns unexpected results. I feel that when parentheses are included that they override the precedence of the operators. If this is the case, the NOT_EQUAL_CHECK must be the negation of the EQUAL_CHECK, right? 10.2.0.4 on a machine using in AIX.
  

  WITH src AS
      (SELECT 'T' AS var1, 'T' AS var2 FROM dual
      UNION ALL
      SELECT 'T' AS var1, 'F' AS var2 FROM dual
      UNION ALL
      SELECT 'T' AS var1, NULL AS var2 FROM dual
      UNION ALL
      SELECT NULL AS var1, 'F' AS var2 FROM dual
      UNION ALL
      SELECT NULL AS var1, NULL AS var2 FROM dual
      )
    --
    --
    SELECT   nvl(var1, 'NULL') AS var1,
        nvl(var2, 'NULL') as var2     ,
        CASE
          WHEN((var1 = var2) OR (var1 IS NULL AND var2 IS NULL))
          THEN 'T'
          ELSE 'F'
        END AS equal_check,
        CASE
          WHEN NOT((var1 = var2) OR (var1 IS NULL AND var2 IS NULL))
          THEN 'T'
          ELSE 'F'
        END AS not_equal_check
      FROM src
      ORDER BY var1,
        var2;
  
  VAR1   VAR2   EQUAL_CHECK   NOT_EQUAL_CHECK
  -------------------------------------------
  NULL   F      F             F
  NULL   NULL   T             F
  T      F      F             T
  T      NULL   F             F
  T      T      T             F

  The reason is

  NOT ((var1 = var2) OR (IS NULL var1 AND var2 IS NULL))

  If var1 and var2 is null then var1 = var2 is unknown

  Now unknown or FALSE = unknown---> NOT (unknown) = false

  He documented I did not find tom even explain it