Compare the value Null

Similar Questions

• by comparing the value to the variable null

  Hey guys, quick question. I just want to see if my understanding of the code below is correct:
  
  Declare
  v_variable varchar2 (100)
  Begin
  v_variable: = null;
  
  If v_variable = 'test' then
  message ('test');
  end if;
  
  If v_variable! = 'test' then
  message ('test2');
  end if;
  
  If my interpretation is correct, "test2" message should print but wont 'test' or is it possible that I could get an error if we cannot compare with null values?
  
  Thank you
  
  Thank you.
  
  
  
  
  End;

  You must compare the values null, is null. A comparison of null = or! always = the NULL value and thus you reach your outings:

  $[CHE_TEST@asterix1_impl] r
    1  begin
    2  if null = null then
    3  dbms_output.put_line('result: true');
    4  elsif null != null then
    5  dbms_output.put_line('result: false');
    6  else
    7  dbms_output.put_line('result: else');
    8  end if;
    9* end;
  result: else
  

  The two if the conditions are evaluated to NULL, then the else branch is executed.

  acutally null = null evaluates to null as you can see:

  $[CHE_TEST@asterix1_impl] r
    1  declare
    2    bres boolean;
    3  begin
    4    bres := null = null;
    5    if bRes is null then
    6      dbms_output.put_line('Result: NULL');
    7    else
    8      dbms_output.put_line('Result: NOT NULL');
    9    end if;
   10* end;
  Result: NULL
  

  See
  http://docs.Oracle.com/CD/B19306_01/AppDev.102/b14261/if_statement.htm#LNPLS01324

  see you soon

• Siri in him sending text with the value 'NULL '.

  When I say, "Siri, text my wife, 'X', ' Siri responds correctly,"here is your message to Jill: 'X'. "" "  "Ready to send it?"  I say 'Yes' and sends the message.  As soon as I get a text from my carrier saying the recipient of the message was invalid.  100% of the time, I see that Siri has sent a text with the value NULL.

  I tried to restart my phone.  I tried to remove and re-add my contacts.  Anyone else having this problem?  Someone knows how to solve?

  If it's by the carrier, you should contact them and see what they receive in return for their side. Ive had Siri send messages for me and I have never seen this one IOS.

• using the value null with a function

  Guys, newbie here

  What is the value NULL in function header? Does this mean that I can pass a value zero?

  FUNCTION tot_sales

  (company_id_in IN company.company_id%TYPE,

  status_in IN order.status_code%TYPE: = NULL)

  RETURN NUMBER

  Hello

  dorianpc wrote:

  Guys, newbie here

  What is the value NULL in function header? Does this mean that I can pass a value zero?

  FUNCTION tot_sales

  (company_id_in IN company.company_id%TYPE,

  status_in IN order.status_code%TYPE: = NULL)

  RETURN NUMBER

  You can always pass NULL for any argument.

  What does this code mean, is that the argument is optional (what, you don't have to spend), and if you do not pass it, status_in will be NULL inside the function.

  So call for your function with 1 argument, like this:

  t: = to_sales (c);

  is equivalent to calling with 2 arguments, like this

  t: = to_sales (c, NULL);

  where the 2nd argument is null.

• Calculated field with the currency formatting, and hiding the values null

  I am designing a PDF form for quote and I have a field defined to multiply the amount of an article and the unit price to the total price.  There are 5 lines on each quote, and if users are citing only 1 or 2 items I want the values null in fields unused price extended to be hidden.

  I did it with the following script

  If (event.value == 0) event.value = ";

  But when I enter the quantity and total price of price is displayed as a regular number (100) instead of currency ($100).

  I can format to currency with

  Event.Value = util.printf ("$%.2f", event.value);

  I don't know there's a way to combine to give rise to such a situation then, so if the field is 0, make null and if not then format as currency but I don't know how to do it.

  Any help would be appreciated.

  Andrew

  Newer versions of Acrobat hide zero for fields values using the number format and with a currency symbol. »

  But since you can't control the updating of user systems, you must use a small function documented for formatting numeric fields on the fly.

  With the extended price field set to 'None' format, you can add the following script to the Validation script "Custom" or add it to a custom JavaScript calculation. The "Custom Validation will work with any method of calculation. Note that the form must be cleaned or recalculated to see the result of the validation script change.

  if(Event.Value == 0) {}
  Event.Value = ""; set the field value to null to a value of zero
  AFNumber_Format (2, 0, 0, 0, "", true); number with no currency symbol format
  } else {}
  AFNumber_Format (2, 0, 0, 0, "$", true); for the format of the values non-null for number with the currency symbol
  }

  The positional parameters are the number of decimal places, the Style separator, negative value Style, Style of (unused) currency, currency symbol, the currency symbol Pre-hanging chain.

• How can I compare the value of column within the COUNT() function?

  I want to compare the value of the column within the COUNT() function as below how ever it gives me the error. I want to calculate the percentage, how can I do this task?
  Thank you.
  
  
  SELECT department_id
  , COUNTY (salary < 250000) / COUNT (*)
  OF plch_employees
  GROUP BY department_id
  ORDER BY department_id;

  SELECT  department_id.
          COUNT(CASE WHEN salary < 250000 THEN 1 END) / COUNT(*)
    FROM  plch_employees
    GROUP BY department_id
    ORDER BY department_id
  /
  

  SY.

• By comparing the value 'sets '.

  Hello
  
  I have a table TAB1 resembling:

  COL   DESCRIPTION
  ----  -----------
  1001  10,11,12
  1002  10,11
  1003  10
  1004

  I would compare the values separated by commas of DESCRIPTION field with values separated by commas of a user input string. It would be something like:

  SELECT COL
  FROM TAB1
  WHERE <user_input> IN DESCRIPTION

  If the user enters anything, the result of the query would be 1001, 1002, 1003, 1004
  If the user enters "10" the result of the query would be 1001, 1002, 1003
  If the user enters the "11" the result of the query would be 1001, 1002
  If the user enters 10 ', 12' the result of the query would be 1001
  
  How can I apply this in Oracle 10 g?
  
  PS: The comma separate values in the DESCRIPTION field and user input are always sorted/ordered!
  
  Thanks in advance,
  Peter
  
  Published by: user3764335 on June 7, 2011 02:53

  You can try something like

  Where ','||description||',' like '%,'||replace(user_input,',',',%,')||',%' 
  

  NOT TESTED

  Max

• How to compare the value of two combo

  I have two Combo Box (cbFirst & cbSecond). I want to compare the value that has been selected by the user and according to the result, the output is displayed. In the two combo box, I have provided the value.

  Here is my code:

  var a: number;
  var b:Number;

  function First(evt:Event):void {}
  a = evt.target.value;
  trace (a);
  }
  cbFirst.addEventListener (Event.CHANGE, first);

  function Second(evt:Event):void {}
  b = evt.target.value;
  trace (b);
  }
  cbSecond.addEventListener (Event.CHANGE, second);

  If (a > b) {}

  trace ("more")

  on the other

  trace (b is higher);

  Trace the statement inside the functions work very well and the value correct a & b is printed. But the comparison in the if statement does not seem to work. Could you please help me.

  There is a typing error.  Fix it or delete it:

  var a: number;
  var b:Number;

  function First(evt:Event):void {}
  a = evt.target.value;

  trace (a);
  compareF();
  }
  cbFirst.addEventListener (Event.CHANGE, first);

  function Second(evt:Event):void {}
  b = evt.target.value;
  trace (b);

  compareF()
  }
  cbSecond.addEventListener (Event.CHANGE, second);

  function compareF() {}

  If (a > b) {}

  trace ("more")

  on the other

  trace (b is higher);

  }

• trigger with: new and: old to compare the values

  Jin
  I want to use the trigger with: new: old to compare the old values with new ones.
  I have an employee of the table
  
  Name Null? Type
  ENO NOT NULL NUMBER 4
  ENAME VARCHAR2 (20)
  SALARY NUMBER (10.2)
  
  now I want to set up a trigger so that it checks everything by inserting the values as part of if
  the insertion of salary value is greater than the last salary (line) table. If it fails, then it will be
  raises an application error.
  I can't write this code as is return errors.
  Thank you
  
  Published by: user13371438 on Sep 6, 2010 03:00

  Please share the code you have written to achieve so far.

• compare the value of previous line with the current value

  I need to compare the previous value with the current value. All Oracle functions could there be to do?
  Something similar as a result.
  If previous (Amt {}) > Current (({Amt}) then 0 Else Null.)

  Something like that?

  SQL> WITH test_data AS
    2  (
    3          SELECT 107019 AS ID, 1583 AS AMT FROM DUAL UNION ALL
    4          SELECT 107019 AS ID, 1572 AS AMT FROM DUAL UNION ALL
    5          SELECT 107019 AS ID, 1572 AS AMT FROM DUAL
    6  )
    7  -- END SAMPLE DATA
    8  SELECT  ID
    9  ,       (CASE
   10                  WHEN LAG(AMT,1) OVER (PARTITION BY ID ORDER BY ID) = AMT THEN NULL
   11                  ELSE AMT
   12          END) AS AMT
   13  FROM test_data;
  
          ID        AMT
  ---------- ----------
      107019       1583
      107019       1572
      107019
  

• compare the value of all the 10 seconds

  Hello

  I collect data continuously send orders. I now compare a value of them every 10 seconds. I have attached example vi here with. I have to read the data and every 10 seconds, I have to check the weather it ok or not.i I could do?

  Yes you can do check the attached example

• Block Oracle's PL/SQL by comparing the values to 4 decimal places

  Hello

  I use Oracle Database 11 g 2. I wrote a simple PL/SQL block that validates as false. Basically trying to ensure that the calculation of FX's 4 correct decimals.

  Example if,

  1,000 vs 1.0000 should have the value false

  1,0000 vs 1.0000 must be set to true

  To this end, I'm doing string comparison. I don't know why the following code evaluates to "false", or what is the right way to make this comparison in PL/SQL?

  declare
  l_fx_rate varchar2(100) := to_char(1, '9999.9999');
  l_aud_usd varchar2(100) := to_char((23/23),'999999.9999');
  
  
  BEGIN
  htp.p(l_fx_rate);
  htp.p(l_aud_usd);
    IF l_fx_rate = l_aud_usd
    THEN
  htp.p('true');
    else
  htp.p('false');
    END IF;
  END;
  

  Thank you.

  • l_fx_rate varchar2 (100): = to_char (1, '9999.9999');
  • l_aud_usd varchar2 (100): = to_char ((23/23), '999999.9999');

  The first STRING has 4 digits left of the decimal separator and the second CHANNEL has 6 digits to the left of the decimal separator.

  4 is NOT equal 6.

  You can EASILY see if you actually view the values that uses Oracle.

  with q as (select to_char (1, '9999.9999'), v1, v2 to_char ((23/23), '999999.9999') of double)
  Select the v1, v2, dump (v1), (v2) dump, case when v1 = v2 then "true" end if 'false' q v3

  V1 (V1), V2, DUMP DUMP (V2), V3

  1.0000, Typ = 1 Len = 10: 32,32,32,32,49,46,48,48,48,48, 1.0000, Typ = 1 Len = 12: 32,32,32,32,32,32,49,46,48,48,48,48, false

  See the 4 space characters (32,32,32,32) in the first value chain? See the 6 in the second value?

  Oracle compares "1.0000' to ' 1.0000' and the strings are NOT the same."

• Disqualification: Compare the value list in another Table

  I'm relatively new to the Disqualification.

  I use the 11.1.1.7 version.

  I have 2 tables Oracle.  Table1.FieldA does not have a foreign key constraint (but should be) at Table2.FieldB.

  I created a snapshot for Table1 that includes FieldA.

  I created another cliché to Table2 which includes FieldB.

  I am trying to compare the Table1.FieldA with Table2.FieldB value to make sure that there is.

  I can think of a few processors that I could, but they seem to compare a value with another value in the same snapshot (table).

  Any advice would be helpful.

  
  Thank you.

  Ray

  Hello

  Use the search check if you want to just check between the tables. According to the reference database, you need create a list of choices on the table (can be either staged as you, or just a list of external choice provided the lookup columns are indexed). Use Lookup and return if you want to import data in the other table in your process. You can control if you want a 1:1 or from a 1:M relationship, and if you go back several records, you can use split chronogram: table with all the paintings of entry to create an intermediate join process.

  Mike

• Getting the value null inserted in the back end when the field is turned off

  Hi gurus,

  I have a TOTAL field that is the sum of the other two fields in a form. I have disabled because do not have the user enter the value. The TOTAL field is the poster of the sum of the values in the front end, but in the back-end, the value is null. Please help me solve this problem. Thanks in advance.

  Have you tried to make the point read-only? Set the read-only item and try. You can do the unalterable element by two methods,

  (1) amend section-> go to read only tab-> read-only Condition Type: always

  (2) create a dynamic Action-> event: loading the Page-> Action: run the JavaScript Code-> Code:

  $('#P1_TEST').attr ('readOnly', true);

  $('#P1_TEST').css ('background-color', '#CDCDCD');

  Tom wrote:

  set the item read-only instead (not editable by the user but will present)

  Set the element value using the da no need to activate the item before submitting because the element is not disabled. Make the point read-only so that it will submit the value to the session and point cannot be changed always.

  Thank you

  Lacombe

• What is the empty string, the value null in the column, or...?

  I use Oracle 11.2, a table tb_class as follows:
  
  TB_CLASS (number (3) id, varchar2 (32) nm, seqNum number (3));
  
  1, 212
  2, "under", 12
  3, 'qq', 12
  
  Select * from TB_CLASS where id = 1 and n = null;... .no selected line
  Select nvl (nm) in the TB_CLASS where id = 1; ... 1 selected line
  
  Any know what's in the column of row id = 1 nm? I thought that it is an empty string, but why it returns no rows in the first query?
  
  Thank you!

  (1) in Oracle there is no difference between NULL and an empty string.

  (2) NULL is never equal to what whatsoever (including another NULL). NULL is never spotty what whatsoever (including another NULL). You must use the IS NULL and IS NOT NULL operators to search for NULL values

  SELECT *
    FROM tb_class
   WHERE nm IS NULL
  

  or

  SELECT *
    FROM tb_class
   WHERE nm IS NOT NULL
  

  Of course, it is also possible that you declare that the NM column contains one or more spaces or it contains one or more non-printable characters and not a NULL value. That's why we asked you what dump (nm) returns

  Justin