Unlike 2 operations

Hi all


I'm trying to lead both to an explanation as to why the sqls give the same result?


1. SELECT TO_NUMBER (TO_CHAR (SYSDATE, "YYYY")) + 1

FROM DUAL;


This adds a 1 to the number and results in 2016


2. SELECT TO_NUMBER (TO_CHAR (SYSDATE, 'YYYY') + 1).

FROM DUAL;


Also, this gives the same result although it seems to add 1 to the character.

Why oracle does not allow to add the number of a data format character?


Thanks in advance



+ 1 in the second case does not add a 1. The operator of string concatenation in Oracle is |, not +.

Thus, Oracle performs an implicit data conversion and converts to_char (sysdate, 'YYYY') into a number implicitly added and then since to_number takes a character argument, implicitly converts this number back into a string and calls to_number on it.

In other words, the second option is terrible.

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    "POSTING_COST_CENTER",
    "ORIG_COST_ELEMENT",
    "ORIG_COST_CENTER",
    "ORIG_PROFIT_CENTER",
    "TRADING_PARTNER",
    "WORK_ORDER_NUMBER",
    "DR_CR_ID",
    "LEDGER_SIGN",
    "QUANTITY",
    "AMOUNT",
    "MONTH_NUMBER",
    "MONTH_PERIOD",
    "GL_JOURNAL_CATEGORY",
    "AMOUNT_TYPE",
    "ALLOCATION_ID",
    "TARGET_CREDIT",
    "CROSS_CHARGE_COMPANY"
  )
SELECT crdetail.nextval,
  "COMPANY",
  "GL_ACCOUNT",
  "COST_CENTER",
  '5253000',
  "PROFIT_CENTER" ,
  "MASTER_ORDER",
  "ORDER_NUMBER",
  "FUNDING_PROJECT",
  ' ',
  "POSTING_COST_CENTER",
  "ORIG_COST_ELEMENT",
  "ORIG_COST_CENTER",
  "ORIG_PROFIT_CENTER",
  " TRADING_PARTNER",
  "WORK_ORDER_NUMBER",
  CASE
    WHEN amount > 0
    THEN 1
    ELSE -1
  END,
  1,0,
  ROUND(amount * 0.0574000000, 2),
  month_number,
  0,
  '593',
  1 ,
  7,
  'TARGET',
  ' '
FROM
  (SELECT "COMPANY",
    "GL_ACCOUNT",
    "COST_CENTER",
    "PROFIT_CENTER",
    "MASTER_ORDER",
    "FUNDING_PROJECT",
    "POSTING_COST_CENTER",
    "ORDER_NUMBER",
    "ORIG_COST_ELEMENT",
    "ORIG_COST_CENTER",
    "ORIG_PROFIT_CENTER",
    "TRADING_PARTNER",
    "WORK_ORDER_NUMBER",
    month_n umber,
    0,
    SUM(amount) amount,
    SUM(quantity) quantity
  FROM CR_COST_REPOSITORY
  WHERE (amount_type    = 1 )
  AND (month_number     = 201404)
  AND ( "MASTER_ORDER" IN MASTER_ORDER
  AND EXISTS
    (SELECT 1
    FROM
      (SELECT SUBSTR(ELEMENT_VALUE, 1, DECODE(INSTR(ELEMENT_VALUE, ':'), 0, L ENGTH(ELEMENT_VALUE) + 1, INSTR(ELEMENT_VALUE, ':')) - 1) AS ELEMENT
      FROM CR_STRUCTURE_VALUES2
      WHERE STRUCTURE_ID       = 2
      AND DETAIL_BUDGET        = 1
      AND STATUS               = 1
      AND UPPER(PARENT_VALUE) IN ('ELECTRIC ALL OTHER','ELECTRIC COR')
      MINUS
      SELECT SUBSTR(ELEMENT_VALUE, 1, DECODE(INSTR(ELEMENT_VALUE, ':'), 0, LENGTH(ELEMENT_VALUE) + 1, INSTR(ELEMENT_VALUE, ':')) - 1) AS ELEME NT
      FROM CR_STRUCTURE_VALUES2
      WHERE STRUCTURE_ID      = 9
      AND DETAIL_BUDGET       = 1
      AND STATUS              = 1
      AND UPPER(PARENT_VALUE) = 'A&G OH ORDER EXCLUSION'
      ) Z
    WHERE Z.ELEMENT = MASTER_ORDER
    )
  AND "GL_ACCOUNT"   <> '91081001'
  AND "COST_ELEMENT" IN COST_ELEMENT
  AND EXISTS
    (SELECT 1
    FROM CR_ST RUCTURE_VALUES2 A
    WHERE A.STRUCTURE_ID = 5
    AND A.DETAIL_BUDGET  =1
    AND A.STATUS         = 1
    AND COST_ELEMENT     = A.ELEMENT_VALUE
    )
  AND "GL_ACCOUNT" NOT IN ('5100000','5325000','5327000')
  AND "SOURCE_ID"      <> '7' )
  GROUP BY "COMPANY",
    "GL_ACCOUNT",
    "COST_CENTER",
    "PROFIT_CENTER",
    "MASTER_ORDER",
    "FUNDING_PROJECT",
    "POSTING_COST_CENTER",
    "ORDER_NUMBER",
    "ORIG_COST_ELEMENT",
    "ORIG_COST_CENTER",
    "ORIG_PROFIT_CENTER",
    "TRADING_PARTNER",
    "WORK_ORDER_NUMBER",
    month_number
  )

    Enjoy your first answer on this.

    Thank you and best regards,

    Murali

    Option 1:

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    Option 2:

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    It would be useful to see the results of a call to explain the plan / dbms_xplan.display in both cases so that we can see the variation in estimates of Oracle.

    Concerning

    Jonathan Lewis

  • That I improve my operating system on my Mac.  Is it possible to upgrade my version of Dreamweaver (to 2005) so that I can always use it on my Mac?

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