Primary Key and Chronological Key for Time Dimension

Could someone please shed light whether it's better to use normal PK or Calendar Date (which is a chronological key on the most detailed level). I tried both and haven't noticed any difference. But my understanding is that I still need to have the PK key on the most detailed level in time hierarchy.
Thanks

Matt,
the PK of the Time Dimension is a regular sequence numeric key. I have it defined as a logical PK for the dimension. However, I guess I was talking about hierarchy key. I tested it either way and the query time is the same. So I guess it doesn't really matter.
--------Year
Year (chronological key and primary key)
------------------Quarter
Quarter (key)
Quarter+Year (primary key, chronological key)
---------------------------------Day Detail
PK (key)
Date (primary key , chronological key)
I hope it makes sense.

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Time dimension and chronological key

HI ALL
I WORK ON OBIEE 11G REPORTS
WHAT IS THE EXACT USE OF TIME CHECK BOX AND CHRONOLOGICAL KEY??
AND HOW CAN I USE IT
ANY HELP ??

Hi,
What is the chronological key use?
A. Typically time dimension differs from all other dimensions in one way and that is,
all other dimensions dont care about the order of the values in it.
e.g. in region_dim the values are north, south, west and east. Here nobody wants to see whether north comes first or south comes first. i.e. no order is required here.
in the case of time dimension there needs to be a particular order for all the values present in it.
e.g. 2010 is earliest and 2004 is older. Dec-10 is earliest and jan-10 is older. i.e. the values in the time dimensiion needs to follow a particular sorting order. So the chronological key is the key which tells the obiee that the data is incrementing based on the chronological column.
Here you may get another doubt. i.e. you are having columns like year, half_year, quarter, month, week and day. Here which one should become the chronolgocial key?
Analyse it yourself. If you kept year as chro key then obiee will be confused whether jan-10 is earliest or feb-10 is earliest. Because it knows only that 2010 is earliest and 2009 is older.
So always it should be the lowest level oif the dimension which needs to be the chronological key. In the abouve case it should be date.
You can select either date or date_id(this could be a sequence generator values).
2. what is the use time dimension?
A.If all you want is to achieve drills from Month, Quarter and Year then treat it as a normal dimension and create the levels. But if you want to do calculations like YTD, QTD and MTD then you need to create a time dimension.
http://oraclebizint.wordpress.com/2007/11/05/oracle-bi-ee-101332-understanding-todate-and-ago-achieving-ytd-qtd-and-mtd/
Refer the above link for time dimension.
Award points it is useful.
Thanks
satya
Edited by: Satya Ranki Reddy on May 2, 2012 12:29 AM

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Hi,
With respect to functionality both are same.
But in ABAP we only have Primary key for the Database tables declared in the Data Dictionary.
Unique is generally is the term used with declaring key's for internal tables.
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Regards,
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Message was edited by:
Nilesh Hole

Answer for the master!!!
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:8743855576462
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Hello experts,
I am simulating payroll, after entering an absence,
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Hello Revathi,
thanks for replying me ...
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Primary Key and Foreign Key Constraints

Hi All,
I would like to know PRIMARY KEY and FOREIGN KEY constraints on existing oracle tables. Could any one suggest me how to find out.
Thanks,
RED

You can query DBA_CONSTRAINTS to get a list of all the constraints on table A and/or table B. The documentation I linked to gives a full list of the data you can see in DBA_CONSTRAINTS, but it includes things like the referenced table name and referenced constraint name for a foreign key constraint. If A is a parent of B or B is a parent of A, you could match up the parent's primary key constraint to the child's foreign key constraint.
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How to transfer database table contain null values, primary key, and foreign key to the another database in same server. using INSERT method.

how to transfer database table contain null values, primary key, and foreign key to the another database in same server. using INSERT method. thanks

INSERT targetdb.dbo.tbl (col1, col2, col3, ...)
SELECT col1, col2, col3, ...
FROM sourcedb.dbo.tbl
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Erland Sommarskog, SQL Server MVP, [email protected]

Want to switch the position for the Fn key and Ctrl key~~ very annoying

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For most keyboards, the Ctrl Key is at most bottom-left, which
is convenient for the little finger.
Ctrl key is so often used (especially for programmer) such that
it should be easily pressed using litter finger.
Fn key is seldom used (unless for projector, adjust brightness
as such).
I am thinking to change the position of the two keys, does Lenovo
provide this service?

http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/Why-is-the-FN-key-on-the-outside-left-inste...
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Arrow keys and enter key not functioning in Firefox 3.6 when viewing PDF

I'm using Adobe Reader 9.3.0.
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Again, the events work correctly up until I load the PDF onto the page.
I've verified that this error does not occur in Firefox 3.5 and 3.0.
Here is a testcase to reproduce this:
<html>
<head>
    <title>JavaScript - Detecting keystrokes</title>
    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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                x[i].onclick = setEvents;
                if (x[i].checked)
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            if (this.id == 'default') {
                document.defaultAction = !this.checked;
                return;
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</head>
<body>
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<input type="checkbox" id="keydown" /> <label for="keydown">keydown</label><br />
<input type="checkbox" id="keypress" /> <label for="keypress">keypress</label><br />
<input type="checkbox" id="keyup" /> <label for="keyup">keyup</label><br />
<input type="checkbox" id="default" /> <label for="default">Suppress default action</label><br />
<input type="text" id="textfield" /><br />
<button id="emptyWriteroot">Remove messages</button>
</form>
<a href="#" onclick="document.getElementById('docviewer-page').src=pdfURL;return false">Now load IFrame</a>
<p id="writeroot"></p>
<div id="container2" style="border:1px solid black;width:400px;height:200px">
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            name='docviewer-page'
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            scrolling='auto'
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</div>
</body>
</html>
Paste the above into an HTML document. Open the HTML document in Firefox 3.6. Check the four checkboxes. Move into the text field and press arrow keys and enter key to observe the results when it is working correctly. Then click on the "Now Load PDF" link. Press the arrow keys and enter key again and observe that the behavior has changed.
Anybody have any idea why this is happening or how to work around it?

I found a workaround!
By using an object tag instead of an iframe, all the keys seems to work fine and the PDF still renders in the page the same way.
Here's a page that works:
<html>
<head>
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<form id="testForm">
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<input type="checkbox" id="keypress" /> <label for="keypress">keypress</label><br />
<input type="checkbox" id="keyup" /> <label for="keyup">keyup</label><br />
<input type="checkbox" id="default" /> <label for="default">Suppress default action</label><br />
<input type="text" id="textfield" /><br />
<button id="emptyWriteroot">Remove messages</button>
</form>
<a href="#" onclick="document.getElementById('docviewer-page').data=pdfURL;return false">Now load IFrame</a>
<p id="writeroot"></p>
<div id="container2" style="border:1px solid black;width:400px;height:200px">
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            data='http://www.google.com'
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            height='100%'
            ></object>
</div>
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Any fix on home key and search key not working?

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o z
oz
in god we trust
god bless the world

Nope, mines good! IF you have time on warranty maybe a replacement?
Just a thought.
Click Accept as Solution for posts that have solved your issue(s)!
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Because the operating system does not affect the keyboard in that way . .. If the operating system has issues it would switch keys or assign wrong characters.
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Disabled
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iOS: Forgot passcode or device disabled
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Dry another cable
Next try on another computer.
Last
Make an appointment at the Genius Bar of an Apple store.
Apple Retail Store - Genius Bar

Primary Key and Chronological Key for Time Dimension

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