How to create Check Constraint that act as a foreign key?

Similar Questions

• How to create an FK that makes reference to several tables

  Consider the following database:
  

  CREATE TABLE user_type_a (id NUMBER PRIMARY KEY);
  
  CREATE TABLE user_type_b (id NUMBER PRIMARY KEY);
  
  CREATE TABLE user_information (id NUMBER, moment TIMESTAMP, comment VARCHAR2(255));
  
  ALTER TABLE user_information ADD PRIMARY KEY (id,moment);
  
  CREATE VIEW users AS
  SELECT id FROM user_type_a
  UNION
  SELECT id FROM user_type_b;

  For the integrity of the database, I need to respect the following rules:
  
  -id must be unique in the view users
  
  -user_information (id) will be held in users view
  
  Is it possible to do this using regular SQL?
  
  I tried this:
  

  ALTER TABLE user_information ADD FOREIGN KEY (id) references users(id);

  But of course, this does not work.

  Note that this creates a constraint primary key which is disabled and invalidated. It's not apply oneness, it simply documents the optimizer that the data must be unique. Oracle is happy to use a constraint uncommitted on a view to allow the optimizer to make more accurate estimates of the cardinality. He is not happy, on the other hand, to use a constraint uncommitted to apply a foreign key, because there is no index created behind the scenes to apply anything so there is no physical structure to buckle on to verify that the constraint is not violated.

  Justin

• How to create the constraint to take two or more columns at once?

  Hello
  I use Oracle 9i, and I want to create a table like this:
  
  create table t1
  (a number not null,
  b is the number not null check(b>a));
  
  
  Make it clear to you that I want the value of column b is always greater than value column. But it is giving error check constraint cannot reference other columns... and then how to bind this constraint to my columns in the table.

  Connected to Oracle Database 11g Enterprise Edition Release 11.1.0.6.0
  Connected as SYS
  
  SQL>
  SQL> create table t1
    2  (a number not null,
    3  b number not null);
  
  Table created
  
  SQL> alter table t1 add constraint b_greater_than_a check (b > a);
  
  Table altered
  
  SQL> 
  

• How to create a form that requires thousands of boxes?

  Hello forum members

  I have Adobe Acrobat 8 Professional.  I searched the internet and forums for the last few hours and I can't seem to find information on how to create a form with multiple check boxes.  I don't want to give individual names to thousands of boxes.  I am hoping there is a simple solution to my problem.  Maybe don't even need to use checkboxes.

  Here it is...

  I'm a DJ and the wedding season is coming.  For every wedding that I do, I usually give the bride and groom a list of my songs and they choose a bunch of songs they would like to have at their reception.  In the past, I've just been sent word to Web page with songs and they would send me their selections in another document or directly in the email response.  I want to make this process easy for them (and me) in a pdf document where they can simply place a check mark next to the songs they want and then send it to me.  Premium (if possible) I would like to be able to export the songs they have selected in a separate document so that I don't have to go through the full pdf (with thousands and thousands of songs) when they send it to me.

  I would be forever grateful if someone help me or direct me to a link with additional information.

  Thanks in advance,

  Mike

  Probably the best thing to do is to have Acrobat automatically adds checkboxes for you. It would take to add a box character by using a font such as Wingdings next to each song title. When you select "forms > run form field recognition", it detects each box on every page and add the checkbox fields.

  You need to activate the reader of the document (Advanced > user rights enable in Adobe Reader) so that users can save the completed form.

  Once you receive it back, you can run a script to create a list of selected songs. Exactly how do you it depends on indications of the final form that you create.

• How to create Radio button that works like a Menu of rerouting

  Hi all
  
  Thanks in advanced for any help you can offer!
  
  I need assistance with Javascript that will dynamically created radio buttons act like the Menu for rerouting.
  
  Help, please. I need it as soon as POSSIBLE.
  
  I currently use several shortcuts menu (in Dreamweaver) to refresh the screen and additional Jump Menu on the screen. So that a user selects in the menu dropdown will refresh the page and update the content by following Menu go. I use Coldfusion for popular information. I use the URL to see the VARIABLES each refresh of the screen.
  
  Example URL: http://www.haysfluidcontrols.com/haysfluidcontrols/onlinecat/HoseKits.cfm
  
  ALSO, if any buddy knows how to create a Coldfusion page like this which are NOT REFRESHED when each choice, I'd LOVE to hear about it. I know of AJAX, but have not found anything made since then and have not been able to understand how incorperate it into my code.
  
  Thanks again,
  Matt
  

  Thanks for the comments everyone. I came up with a great solution. Thanks to Phil Hegedusich Direction. I am including my solution in this post. I also noticed that this code works with checkboxes.

  Thanks again for the help. I hope this helps others.

• How to create a folder that is NOT a SMART FOLDER?

  (1) how can I create a folder that is NOT a smart folder?

  (2) how can I get a folder to display the NUMBER of items it contains?

  https://support.Apple.com/kb/PH22185?viewlocale=en_US & local = en_US click the blue details.   It's Apple records guide.

• How to create a task that runs once a day, immediately after the opening of session?

  Hello, I'm wondering how to create a task using the Task Scheduler that runs once a day, immediately after I have logon.

  The reason is I want to use Bing Desktop to change my wallpaper every day. However, I just want to run the first time I start my computer every day, so it will change the wallpaper. By default, it starts whenever I have to logon. It's annoying, because I just want it to start once a day to change the wallpaper. However, using the Task Scheduler, I put only a trigger to start "at the opening of session' or"once a day." If I choose once per day, it runs about 5-10 min after I login, instead of logon immediately after. If I choose the two triggers, then it starts after each session.

  Basically, I just want the Task Scheduler to launch the program after the connection the first time I connect to the computer on any given day. How can I do this?

  Hello Jeffrey,.

  You can refer to the links below and see if that helps.

  Create a task

  http://TechNet.Microsoft.com/en-us/library/cc720110 (v = WS.10) .aspx

  Modify a scheduled task

  http://TechNet.Microsoft.com/en-us/library/cc778308 (v = WS.10) .aspx

  Change an existing task

  http://TechNet.Microsoft.com/en-us/library/cc766442.aspx

  Please write back to us for assistance and we will be happy to help you come.

  Thank you

• Windows Live Mail 2011 - how to create a Signature that contains a hyperlink to the address of my website?

  In Windows Live Mail 2011, I am trying to create a Signature that contains a hyperlink to my website address.

  I click on Options - Mail - Signatures - new.

  If I choose 'text' - there is no way to add a hyperlink.

  If I choose "files, browse" do I look for? I'm supposed to be creating an HTML document to the address of the site? and if yes, how do I do that?

  You'll get better help at Windows Live Mail Solution Center - Forum

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• How to create a project that connects in a static library?

  I am trying to create an OpenGL project that depends on a static library which I create in the same workspace in the NDK.  I created two projects (static library and OpenGL app) connects them in the NDK and tried, but I must be missing something because my OpenGL project is not able to see the functions in my static library, even if it is able to find my static library?

  Is there documentation describing step by step how to create two projects and how to relate?

  I found a similar post on the forums and I have solved my problem.

  I used project > add library > library of the project in the workspace but something is broken with this command, because it did not work.

  If you use project > add library > external library, then everything works fine.

• How to create a job that e-mail with csv attached.

  Hello

  Could all help with that.

  I have a trigger that inserts (after changing the DLL) on the diagram at track_t, (table).

  Now, I put a job to convert track_t (table) to CSV data, daily...

  Then, I need to define a job to send the mail on a daily basis with the attached csv.

  set - trigger, procedue to send mail. But how to create a job to send a mail with csv generated

  8ff4363d-844d-49fd-87D1-2125143d11a8 wrote:

  Hello

  Could all help with that.

  I have a trigger that inserts (after changing the DLL) on the diagram at track_t, (table).

  Now, I put a job to convert track_t (table) to CSV data, daily...

  Then, I need to define a job to send the mail on a daily basis with the attached csv.

  set - trigger, procedue to send mail. But how to create a job to send a mail with csv generated

  DBMS_SCHEDULER

  http://docs.Oracle.com/CD/E11882_01/AppDev.112/e25788/d_sched.htm#ARPLS72235

• How to create a button that is persistent on the top of the Gallery HTML page

  Hello

  My InDesign folio, I have an article with photo gallery full HTML page. The photo grid occupies the full screen. I want to create a button that is persistent on top of this gallery, which the user can type to go to the main Menu page. This button is always visible in one place, even as the user scrolls up and down the gallery. I tried to create it on the top layer and the upper layer of the page master, but the button disapperas loading the HTML gallery.
  If the user does not see any button to navigate through the Gallery to another article.

  Any ideas how to create persistent button?

  Thanks in advance.

  -MP

  Why not do things just like an HTML article? You do it in the Muse.

• EBS 11i - how to create a responsibility that can only reset the passwords

  Hello
  
  I need to create a responsibility of helpdesk team reset user passwords, but do not do. I created a menu and I tried "UMX_FORGOT_PWD", "UMX_OBJ_PASSWD_MGMT", "UMX_RESET_PWD" works but without hope. What should I do or how can I add more effort to make it work?

  user13014069 wrote:
  Yes, I meant this one. But it has everything, it can create, edit, close a user so I don't want to use this menu. I want to create a responsibility that questionable users and reset their passwords, that is, not can change anything else.

  For this you must use the customization to restrict who has access to this responsibility / to make all actions other than resetting the passwords.

  How to customize the forms [ID 468657.1]
  Information about the ability to customize the form of Oracle Applications 11i [ID 279034.1]
  Sample unit test for the use of form customization in Oracle Applications [ID 744069.1]
  Limits of customization of forms [ID 420518.1]

  Document personalization of forms
  Document personalization of forms

  Thank you
  Hussein

• How to create a button that scrolls down with page automatically?

  Hello

  I wanted to create a button that brings u to the top of the page when you press on, but I was wondering how to do scroll down with the page on the right side automatically when the some1 scrolls to the bottom of the page.

  An example I saw was on tumblr.com

  PS I'm a newbie, so please explain clearly. d.

  Thank you.

  This solution uses jQuery. When you scroll to halfway to the bottom of the page, an arrow appears on the right.  View source to see the code.

  http://ALT-Web.com/demos/jQueryBack-to-top.html

  Nancy O.

• How to create a form that fills a page of review before being submitted?

  Anyone used Eloqua to create a form that fills a review page that the bidder has to address in order for the form to fill out?

  The sequence would be:

  1. landing page/form
  2. landing page with the data in the form of review
     • The second page with the form data will have to be approved before the presentation or the person could go back and change the data

  Thank you

  Jennifer Rash

  Hi Jennifer,.

  The way to do is to create a form with a field, mapping on a contact field you can set a value from us Let's say 1. and then on the second form, if the user access, he or she cannot present until whoever the approver is changes the value 0 (zero). Once the approval is made (assuming that anyone who needs to do this) the flag should be set to zero.

  Your form 2 form processing step can guide them in appropriate redirection, or javascript on the form page 2 can promot the user to wait for approval.

  Hope this helps... I would like to know if that's what you're looking for.

  Thank you

  Amit

• How to create a button that opens the attachment (file power point attached to the pdf document)

  Hello world!

  The question is in the title.

  How to create a button in Acrobat Pro to open a file attached to PDF?

  I have moved your question to one of the forums of Acrobat, first.

  If the target file is not a PDF file you need to use a script to do it. The structure of the script would be something like this:

  this.exportDataObject ({cName: "Name of the attachment.ppt file", nLaunch: 2});