Check all instances within a table

Similar Questions

• Try to remove duplicates, "show exact duplicates" check all instances of some songs

  I'm trying to remove the duplicates in my iTunes (in thousands) library. I view "replica", but for some songs, it checks all instances of the same song, so I can't delete checked without losing these songs in total. Is there a way to fix this, or what I have to go through the entire library of the song?

  Using the latest version of iTunes on a windows PC.  I read the instructions for the removal of duplicates, but my situation is not covered.

  Thank you

  If an entry in a list of audit checks another which makes me suspect that you watch a playlist in which the same elements have been added more than once, rather than the main list of music. The boxes are global in iTunes. One of the phases in my deduper script mentioned below clearly these duplicates of playlist, however, in its current form you need to run it on every playlist where you have this problem if only would you fix this type of problem. For the cleaning of the library to start with the source music in the view of songs and use exact replica. The current version requires counties to disk and the number of titles to match who I'm not sure was always necessary. If you don't see any duplicates that you would expect that maybe why.

  Official notice of Apple on the duplicates is here: find and remove duplicates in your iTunes library. This is a manual process and article fails to explain some of the potential pitfalls such as the lost coast and membership of playlist, or sometimes the same file can be represented by multiple entries in the library as well as a removal and recycling the file will break all the others.

  Use MAJ > view > show items to reproduce exactly to display the duplicates because it is normally a selection more useful. You must manually select all but one of each group to remove. Sort the list by Date added can make easier select appropriate tracks, but it works better when executed immediately after the dupes were created.  If you have several entries in iTunes connected to a same file on the disk hard then don't not send to trash.

  Use my DeDuper script (Windows only) If you are not sure, do not want to do it by hand, or want to maintain ratings, play counts and playlist membership. See this background thread , this post for detailed instructions and Please take note of the warning to back up your library before deduping.

  (If you don't see the menu bar press ALT to temporarily view or CTRL + B to keep displayed.)

  The latest version of the script can put away the dead links as long as there is at least a double live to merge his stats and membership of the playlist and must deal wisely when the same file has been added through multiple paths.

  TT2

• Raising the event "output" from a drop-down list in all instances of a table row

  I have a drop-down list in a row of table with multiple instances that performs a calculation on the exit event. This calculation takes information from 2 other drop-down lists listed above not repetitive rows of the same table.

  The behavior desired is: If the user change their choices above, all instances of the drop-down list below to execute the "Exit" event script to access the new values above.

  My script is:

  RowOptionalCoverage.DdlCoverageType.execEvent ("exit");     It works, sort of

  It updates only the first instance of RowOptionalCoverage and any subsequent instances. The user can 'Tab' through instances and trigger output for each instance event, but this isn't a reasonable solution.

  I tried using the method resolveNodes without success. I understand, using the method resolveNodes may be required when you reference multiple instances of an object:

  this.resolveNodes ("RowOptionalCoverage [*]. DdlCoverageType [*] ") .execEvent ("exit");"     does not work

  xfa.resolveNodes ("RowOptionalCoverage [*]. DdlCoverageType [*] ") .execEvent ("exit");"      does not work

  No doubt, I have to be incorrectly using the resolveNodes or rate something? Probably something simple.

  All the tips are greatly appreciated.

  Stephen

  Hello Stephen,

  You need to loop through each instance of the line and force the exit event. Without the form, it should look like:

  var oRows = xfa.resolveNodes ("RowOptionalCoverage [*]");
  oNodes var = oRows.length;
      
  for (var i = 0; i)< onodes;="">
  {
  xfa.resolveNode ("RowOptionalCoverage [" + i + "]"). DdlCoverageType.execEvent ("exit");
  }

  You could also index table to determine the number of row repeat:

  var oNodes = RowOptionalCoverage.instanceManager.count;

  You may change this to make it work.

  Good luck

  Niall

• Prevent all instances of a table to run the same code set?

  Hi, as the title suggests, how would you prevent that from happening? Basically, I have a game where the players reproduce units that move automatically to the point of arrival, and there towers throughout the screen which fires to the unit, the unit is in the range. However, the towers that I put in a table all draw to the device when it has reached in the range of one of the towers. (To say things in a different way, I have 3 turns on screen, everyone is supposed to get their own range. However, when the device comes in range of one of the towers, all 3 rounds fire.) In addition, because of the executed code three times, towers fire 3 balls at once more, makes the health of the device decreases by 3 instead of 1. Any help would be appreciated. Thank you! Here's the part of my code. Most of the code for tables is in my Main.as.

  private function level1(e:MouseEvent):void
          {
              gotoAndStop(1, 'level1');
              //Initialise variables
              //Variables for Creep 1
              buttonCreep1 = new btnCreep1;
              stage.addChild(buttonCreep1);
              buttonCreep1.x = 0;
              buttonCreep1.y = 600;
              //Variables for Creep 2
              buttonCreep2 = new btnCreep2;
              stage.addChild(buttonCreep2);
              buttonCreep2.x = 100;
              buttonCreep2.y = 600;
              //Arrays for Creeps
              creep2Array = new Array;
              creep1Array = new Array;
              //Arrays for towers
              tower1Array = new Array;
              tower1BulletArray = new Array;
              //PLACE TOWER POSITIONS HERE
              var tower1New1:MovieClip = new mcTower1;
              tower1New1.x = 313;
              tower1New1.y = 340;
              tower1Array.push(tower1New1);
              MovieClip(root).addChild(tower1New1);
              //
              var tower1New2:MovieClip = new mcTower1;
              tower1New2.x = 590;
              tower1New2.y = 340;
              tower1Array.push(tower1New2);
              MovieClip(root).addChild(tower1New2);
              //
              var tower1New3:MovieClip = new mcTower1;
              tower1New3.x = 466;
              tower1New3.y = 180;
              tower1Array.push(tower1New3);
              MovieClip(root).addChild(tower1New3);
              //
              //Other Variables
              money = 500;
              gamePaused = false;
              currentLevelMinutes = 0;
              currentLevelSeconds = 0;
              //Event Listeners
              stage.addEventListener(Event.ENTER_FRAME, update);
              buttonCreep1.addEventListener(MouseEvent.CLICK, spawnCreep1Lv1);
              buttonCreep2.addEventListener(MouseEvent.CLICK, spawnCreep2Lv1);
              btnBack.addEventListener(MouseEvent.CLICK, exitLevel);
              btnPause.addEventListener(MouseEvent.CLICK, pauseGame);
              btnResume.addEventListener(MouseEvent.CLICK, resumeGame);
          }
  
  private function update(e:Event):void
          {
              //trace ("update function is working")
              creep1Lv1();
              creep2Lv1();
              tower1Handler();
              pauseControl();
              timeControl();
              updateTimeTxt();
              //trace (tower1BulletArray.length);
              //trace (creep1Array.length);
          }
  
  private function tower1Handler():void
          {
              for (var i:int = tower1Array.length - 1; i >= 0; i--)
              {
                  var tower1 = tower1Array[i];
                  tower1.tower1Update();
                  if (!tower1.isReady())
                      continue;
                  for each (var creep1:mcCreep1 in creep1Array)
                  {
                      if (tower1.canShoot(creep1))
                      {
                          tower1Fire(tower1, creep1);
                          tower1.gotoAndPlay(110);
                          tower1.reset();
                          break;
                      }
                  }
              }
          }
          
          private function laser1Handler(e:Event):void
          {
              //Make laser move in direction of turret.
              var newLaser1:MovieClip = e.currentTarget as MovieClip;
              newLaser1.x += Math.cos(newLaser1.rotation * Math.PI / 180) * laser1Speed / creep1Array.length;
              newLaser1.y += Math.sin(newLaser1.rotation * Math.PI / 180) * laser1Speed / creep1Array.length;
              for (var i:int = creep1Array.length - 1; i >= 0; i--)
              {
                  var thisCreep = creep1Array[i];
  
                  //Boundary checking
                  if (newLaser1.x < -50 || newLaser1.x > 800 || newLaser1.y > 600 || newLaser1.y < -50)
                  {
                      newLaser1.gotoAndPlay(2);
                      tower1BulletArray.splice (0, 1);
                  }
                  else if (newLaser1.hitTestObject(thisCreep))
                  {
                      newLaser1.gotoAndPlay(2);
                      newLaser1.removeEventListener(Event.ENTER_FRAME, laser1Handler);
                      tower1BulletArray.splice (0, 1);
                      if (thisCreep.currentLabel == "ChickenIdel" || thisCreep.currentLabel == "chickenIdle")
                      {
                      if (thisCreep.updateHealth(-1) <= 0)
                      {
                          thisCreep.gotoAndPlay(201);
                          creep1Array.splice(i, 1);
                      }
                      }
                  }
                  
              }
          }
  
  

  It's my mcLaser1.as file.

  public class mcLaser1 extends MovieClip 
      {
          
          public function mcLaser1() 
          {
              stop();
              var angle:Number;
              addEventListener(Event.ADDED_TO_STAGE, onAdd);
          }
          
          private function onAdd(e:Event):void 
          {
              removeEventListener(Event.ADDED_TO_STAGE, onAdd);
              addEventListener(Event.ENTER_FRAME, bullet1Loop);
          }
          
          private function bullet1Loop(e:Event):void 
          {
              if (currentLabel == "destroyedComplete")
              {
                  destroyBullet1();
              }
          }
          
          public function destroyBullet1()
          {
              this.parent.removeChild(this);
              removeEventListener(Event.ENTER_FRAME, bullet1Loop);
          }
          
      }
  

  In addition, when a bullet kills a creep, and there is no another goose bumps left on the stage, all the other balls is simply disappear.

  Any help would be appreciated. Thank you!

  for each (var tower1:mcTower1 in tower1Array)
            {

  won't.  There should be no loop for in this function.  use:

  private function tower1Fire(tower1:mcTower1, creep:mcCreep1):void
          {
  
                  var angle:Number = Math.atan2(creep.y - tower1.y, creep.x - tower1.x) / Math.PI * 180;
                  var newLaser1:mcLaser1 = new mcLaser1();
                  newLaser1.rotation = angle;
                  newLaser1.x = tower1.x + Math.cos(Math.atan2(creep.y - tower1.y, creep.x - tower1.x) / Math.PI * 180 * Math.PI / 180) * 60;
                  newLaser1.y = tower1.y + Math.sin(Math.atan2(creep.y - tower1.y, creep.x - tower1.x) / Math.PI * 180 * Math.PI / 180) * 60;
                  newLaser1.addEventListener(Event.ENTER_FRAME, laser1Handler);
                  tower1BulletArray.push(newLaser1);
                  addChild(newLaser1);
  
          }
  
  
  

  and I don't see where you are by checking if a creep is at the tower.

• How do I search a Movieclip given stage and then add all instances of it in a table? AS3

  I would like to add multiple instances of a Movieclip, (name of the library = bats | instance name = none), inside an another Movieclip (name of the instance = back.visuals) / / (by HAND) NOT addChild (mc_name); Easy

  If someone could help me with the code to perform the following steps:

  Search the Movieclip, (name of the instance = back.visuals), which contains the Movieclips, (= bats library name: instance name = none), added manually to the scene at hand.

  Then, for all instances of this movieclip (= bats library name: instance name = none) add them to a table.

  Thank you

  Dyami

  Assuming that you are talking about DURATION, if you export a symbol of action script, give it a class name you can always read if the child of an object is an instance of that symbol.

  Say, if the name of the symbol is bats you can identify it in the loop as follows:

  var enemyList:Array = [];
  for (var i:int = 0; i < back.visuals.numChildren; i++)
  {
            var child:DisplayObject = back.visuals.getChildAt(i);
            if (child is Bats)
            {
                      enemyList.push(child);
            }
  }
  

• I have the sound on all programs within my computer, except YouTube and PPS

  original title: can not play youtube, PPS...

  I have the sound on all programs within my computer, except YouTube and PPS

  Hi NickCserny,

  ·         Did you do changes on the computer before the show?

  ·         You use Internet Explorer? If so, what version of IE are you using?

  Follow these methods.

  Method 1: The possible cause is that the Flash content that is cached get corrupted or damaged, preventing audio streaming work correctly. Follow the steps in the article.

  http://support.Google.com/YouTube/bin/answer.py?hl=en&answer=58132

  Method 2: Disabled the option of "play sounds on the Web page." Follow these steps:

  (a) open Internet Explorer.

  (b) in the Tools menu, select Internet Options

  (c) select Advanced

  (d) to scroll through Multimedia

  (e) check the option "play sounds on the Web page."

  (f) click on apply and ok.

  For reference:

  The video problems with Internet Explorer

  http://support.Microsoft.com/kb/2532294

• How do mediacentre show all instances of a series recorded as an icon in the form of registered programs

  Media Center used to show only 1 screenshot icon through a series of recorded programs. by clicking on this screenshot, all other records showed in the series. Now, all instances are presented individually.

  I prefer the view 'nested' How do I get it back please?

  Hi RC57APR,

  I suggest you to re-run the installation of Windows Media Center and check if it helps you to change the display of the series recorded as you display earlier.

  To rerun setup the Media Center window, follow the steps below:

  a. open Windows Media Center.

  b. Select the task and click settings.

  c. click general, click Windows Media Center Setup.

  d. click on run the installer again.

  This will reset the preferences. Check to see if it helps you find the view or the earlier registrations.

  I hope this helps. Let us know the results.

  Thank you and best regards,

  Srinivas R

  Microsoft technical support.

  Visit our Microsoft answers feedback Forum and let us know what you think.

• all rows in the table are not eligible for the specified partition

  SQL > Alter Table ABC
  Exchange 2 Partition P1 with Table XYZ;
  
  Modified table.
  
  SQL > Alter Table ABC
  Exchange 2 Partition P2 with Table XYZ;
  
  
  P2 Partition Exchange with XYZ Table
  *
  ERROR on line 2:
  ORA-14099: all rows in the table are not eligible for the specified partition
  
  The exchange partition works fine for the first time. However, if we try to swap the 2nd partition it gives the error.
  How to solve this error?
  How can I find the lines which are not qualified for a specific part. is there a query to find out the same thing?

  >
  Well, exchange of syntax and logic is not clearly as it should (IMHO). There is no element of syntax that tells Oracle we want to Exchange partition data in a table that is not partitioned or not partitioned into partition table data.
  >
  What? Not sure where you got that but maybe it was before you had first cup of coffee? ;)

  An "Exchange", it's just that; an Exchange. Partition data end up in the non-partitioned table and vice versa. It is meaningless and totally obsolete if "we want Exchange partition data in a table that is not partitioned or not partitioned into partition table data".
  >
  It was decided by Oracle not partitioned table control. If the non-partitioned table is empty, it means you want to Exchange data partition in a non-partitioned table. And if not partitioned table is not empty, it means you want to Exchange data in the table that is not partitioned into partition.
  >
  There is no decision to make. The segments are swapped. Oracle doesn't check, know or even care if one or the other or both segments are empty. 'Control' which is carried out (by default except if NO CONTROL is used) only consists of ensuring all the data in the segment intended for the partition belongs to this partition.

  It is what gives the example of John. This can NEVER work if table1 is empty unless p1 is empty at the beginning:
  1 Exchange p1 with table1
  2 Exchange p2 with table1

  As John explains, assuming that no other operations are trying to put the data from p1 P2 which is not possible if p1 actually contains data.

  You can save it for next April 1!

• Returns all instances of a word in a document

  I have a PDF 1400 pages document that contains an ID in the format of WARxxxxxx, a total of nine characters, all two pages or more. I'm looking for a way to query for all instances of the ID of. For example:
  
  WAR123123
  WAR010101
  WAR987654
  
  The document is stored in the table to use standard text indexes. I tried to use the ctx_doc.highlight and store the results in another table, but I just PDF gibberish instead of readable English. This type of query and the result is possible thanks to the functions of ctx?
  
  Thank you, Tony

  If you try to use the lengths and offsets from ctx_doc.highlight in dbms_lob.substr on the unfiltered column, then you download pdf gibberish. In the example below, I used ctx_ddl.create_policy to create a policy that uses ctxsys.auto_filter, then used this policy in ctx_doc.policy_filter to convert the blob that contains a pdf file in a filtered clob. I then used the lengths and offsets in dbms_lob.substr on the clob fitlered ctx_doc.highlight. In my example, I searched all the words beginning with "stor".

  -test environment:

  SCOTT@orcl_11gR2> -- create table:
  SCOTT@orcl_11gR2> create table test_tab
    2    (id       number,
    3       test_col  blob)
    4  /
  
  Table created.
  
  SCOTT@orcl_11gR2> -- load data:
  SCOTT@orcl_11gR2> create or replace directory my_dir as 'c:\my_oracle_files'
    2  /
  
  Directory created.
  
  SCOTT@orcl_11gR2> declare
    2    v_bfile     bfile := bfilename ('MYDIR', 'banana.pdf');
    3    v_blob     blob;
    4  begin
    5    insert into test_tab (id, test_col) values (1, empty_blob())
    6    returning test_col into v_blob;
    7    dbms_lob.fileopen (v_bfile, dbms_lob.lob_readonly);
    8    dbms_lob.loadfromfile (v_blob, v_bfile, dbms_lob.getlength (v_bfile));
    9    dbms_lob.fileclose (v_bfile);
   10  end;
   11  /
  
  PL/SQL procedure successfully completed.
  
  SCOTT@orcl_11gR2> -- create index:
  SCOTT@orcl_11gR2> create index test_idx
    2  on test_tab (test_col)
    3  indextype is ctxsys.context
    4  /
  
  Index created.
  

  -policy and request function:

  SCOTT@orcl_11gR2> -- create policy that uses ctxsys.auto_filter:
  SCOTT@orcl_11gR2> begin
    2    ctx_ddl.create_policy ('test_pol', 'ctxsys.auto_filter');
    3  end;
    4  /
  
  PL/SQL procedure successfully completed.
  
  SCOTT@orcl_11gR2> -- create function that uses policy:
  SCOTT@orcl_11gR2> create or replace function get_words
    2    (p_idx     in varchar2,
    3       p_rid     in rowid,
    4       p_query in varchar2,
    5       p_blob     in blob)
    6    return        sys.odcivarchar2list
    7    authid        definer
    8    pipelined
    9  as
   10    v_clob       clob;
   11    v_hightab  ctx_doc.highlight_tab;
   12  begin
   13    dbms_lob.createtemporary (v_clob, true);
   14    ctx_doc.policy_filter ('test_pol', p_blob, v_clob);
   15    ctx_doc.set_key_type ('rowid');
   16    ctx_doc.highlight (p_idx, p_rid, p_query, v_hightab);
   17    for i in 1 .. v_hightab.count loop
   18        pipe row
   19          (dbms_lob.substr
   20             (v_clob,
   21              v_hightab(i).length,
   22              v_hightab(i).offset));
   23    end loop;
   24    dbms_lob.freetemporary (v_clob);
   25    return;
   26  end get_words;
   27  /
  
  Function created.
  
  SCOTT@orcl_11gR2> show errors
  No errors.
  SCOTT@orcl_11gR2> -- query that uses function:
  SCOTT@orcl_11gR2> column words format a30
  SCOTT@orcl_11gR2> select distinct t.id, x.column_value as words
    2  from   test_tab t,
    3           table (get_words ('test_idx', t.rowid, 'stor%', t.test_col)) x
    4  where  contains (t.test_col, 'stor%') > 0
    5  /
  
          ID WORDS
  ---------- ------------------------------
           1 store
           1 stores
           1 Storage
  
  3 rows selected.
  

• Convert all Instances of a graph to a MovieClip

  Well, so I created an animation, many parts which are of simple graphics, and everything works fine.

  However I realized now that I need to the graphics or movieclips so that I can activate some scripted behaviour. Now, I know how by selecting the frame, by selecting the chart and by changing its type to MovieClip, but this works only for a single keyframe at a time which is simply not an option, because I have a lot of keyframes for a single image, and I have several that need to convert.

  So what I want to know is; is it possible that I can convert all instances of a chart in a calendar in a movieclip?

  If Flash doesn't have this capability as standard, then are the scripts/commands I can install it? I have a very useful to easily name a bunch of instances of movieclip, but it won't convert the graphics, unfortunately.

  If there is no command is, then can still tell me some good examples of how to create a custom command? In particular I need to know how to find the current selection (frames) and work through them looking for graphics to be converted.

  Hi Haravikk,

  You can check this link - http://gingold.com.au/content/view/89/68/

  Let me know if you have questions.

  Thank you and best regards,

  Roger Simon

  Adobe Flash Professional Team

• Script to stop all instances of weblogic running on a box

  Hello
  
  There the script to stop all instances of weblogic running on a Unix machine at a time?
  
  My understanding is grep for weblogic and then issue kill-9 process.
  
  Correct me if im wrong and also provides good script to stop all instances of weblogic.
  
  Thank you!!

  Hello

  You can use simple JMX code to achieve the same (all servers within a domain at a time stopping):

  Topic: Force Shutingdown WLS using JMX
  http://middlewaremagic.com/WebLogic/?p=55

  NOTE: The code above JMX is supposed to close just down the AdminServer, you can remove the if {} block of line no-60 the following code JMX stop all servers rather than to stop only the server administrator.

  Thank you
  Véronique Mody

• deselect all rows in af: table in the adf.

  Dear all,
  
  I have af:table with activated single selection. When the page is initially loaded I want all rows of the table deselection... so, how can I achieve this?
  
  
  Thank you.
  Kind regards.
  
  jdev version 11.1.1.4.0

  Remove the attribute according to the definition of af: table when a display object is instance fell into the page in a table:

  selectedRowKeys = ' #{bindings. " Employees.collectionModel.selectedRow}.

  The example of table definition should look like:

  
  lines = ' #{bindings. " Employees.rangeSize}.
  emptyText = "#{bindings." Employees.Viewable? "{'No data to display.': 'Access Denied.'}".
  fetchSize = "#{bindings." Employees.rangeSize}.
  rowBandingInterval = '0 '.
  selectionListener = "#{EmpTableBean.onTableNodeSelection} '"
  rowSelection = "single" id = "t1" >

  The following code can be used to get the selected node - after the user selects a node:

  {} public void onTableNodeSelection (SelectionEvent selectionEvent)
  resolveMethodExpression ("links. Employees.collectionModel.makeCurrent} «»
  NULL, new class [] {SelectionEvent.class},
  (New Object() {selectionEvent});
  Object richeTableau = (RichTable) selectionEvent.getSource ();
  Line line = null;
  {for (object facesRowKey: {object.getSelectedRowKeys ())}
  object.setRowKey (facesRowKey);
  Object o = object.getRowData ();
  JUCtrlHierNodeBinding rowData = o (JUCtrlHierNodeBinding);
  line = rowData.getRow ();
  }
  System.out.println (Row.GetAttribute("FirstName"). ToString());
  }

  public Object resolveMethodExpression (String expression, class returnType,
  Class [] argTypes,
  Object [] argValues) {}
  FacesContext facesContext = FacesContext.getCurrentInstance ();
  Application app = facesContext.getApplication ();
  ExpressionFactory elFactory = app.getExpressionFactory ();
  ELContext elContext = facesContext.getELContext ();
  MethodExpression methodExpression =
  elFactory.createMethodExpression (elContext, expression, returnType,
  argTypes);
  Return methodExpression.invoke (elContext, argValues);
  }

  Thank you
  Nini

• Is there a way to match all columns in a table?

  Oracle 11.1.0.7:
  
  Is it possible to say match all columns in A table with table B? For example:
  
  Table A
  --
  ID
  name
  
  Table B
  --
  ID
  name
  
  Is there a way to say matches all columns with a similar column in others in a select statement instead of making "where A.id = B.id and B.SID = b.name? I'm trying to write a script of comparison to check that replication is in effect doing the right thing.

  user628400 wrote:
  Is there a way to say use 'Less', but exclude the column 'y' and 'z' comparison?

  Not without explicitly listing the columns that you want to compare in the different SELECT lists, no.

  If it was something you wanted to do on a regular basis (looks like it's just a unique validation), you could potentially generate the statement LESS through dynamic SQL where you could easily exclude some columns. But it's more work that simply listing the column names in a static SQL statement, unless you plan to do on a regular basis.

  Justin

• I have 50 GB of iCloud and my computer is full because of photo storage problems. How can I get these pictures in my icloud? I checked all my settings. Everything is as it should be. I feel as if I had downloaded originals or something.

  I have 50 GB of iCloud and my computer is full because of photo storage problems. How can I get these pictures in my icloud? I checked all my settings. Everything is as it should be. I feel as if I had downloaded originals or something. I don't know how to understand it. I Googled, I tried to get on my computer. Emptied my Recycle Bin and my download folder. I know I must be missing something.

  We need to switch to "Optimize the storage of Mac", see it - http://www.imore.com/how-save-space-optimized-storage-and-icloud-photo-library

• The sound of Apple received email saying and tells me to check the password within 48 hours.  Scam?

  rreceived 'Apple' email, telling me to check the password within 48 hours.    Is it a scam?

  Yes, it's almost certainly a scam.

  The only time where Apple will send you a letter about your password is if you click on the "Forgot password" link on one of their sites, and even in this case the email will tell you how change or reset, has not check.