What is "composition" of key multilingual on iPad?

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• Oracle cannot validate the composite foreign key when NULLs comes into play

  Hi all

  When a composite foreign key is used in a schema. Oracle does not check the necessary rules correctly, as indicated below.

  create the table parent_tab
  (
  x int,
  int y,
  z int,
  primary key for constraint p_key (x, y)
  );

  create the table child_tab
  (
  x int,
  int y,
  z int,
  Constraint f_key foreign key (x, y) refers to parent_tab (x, y)
  );

  insert into child_tab (x, y, z) values (1, NULL, 4);
  commit;

  Select count(x|| y) from parent_tab;

  0

  
  Select count(x|| y) from child_tab;

  1

  Tom Kyte says the following for an explanation.

  The database is unable to validate a foreign key when it is partially null. To assert the rule MATCH FULL for composite foreign keys, you add a constraint to your table:

  The constraint will ensure that either

  • All columns have NULL value in the foreign key, or
  • None of the columns are set to NULL in the foreign key

  As long as this constraint is in place, your foreign key will work as you probably think that it should.

  However, it does not explain WHY? I mean why Oracle is unable to validate the foreign key when it is partially NULL?

  Concerning

  John Spencer wrote:

  He thinks logically.  You have a composite PK of two columns, so 1, 1 is a valid key, as these are the 1, 2 and 1, 3 and 1.42.  In the child table, you have a line 1, the null value.

  What parent should have the child?

  I wish that it would be logical about this. Unfortunately, Oracle applies different rules in different cases. For example, parent of the value 1, NULL value and 1 child, NULL is not the same as NULL is equal or not equal to null. At the same time, one constraint unique index / unique Treaty, 1, NULL, equal to another 1, NULL NULL treatment as being equal to NULL and don't let several lines with 1, the NULL value.

  SY.

• change a composite primary key

  
  Hello

  I have a table that has a composite primary key with 3 columns (col1, col2, col3)

  Now I need to change the primary key (col1, col2, col4) remove composite col3 replace with col4

  col1	col2	COL3	COL4	col5
  1	one	x	p	DFD
  1	one	There	p	DFD
  1	one	z	p	SD
  1	one	m	p	amplifier
  1	one	n	p	Try

  There are thousands of records in the table in the format above. How to make this change?

  Thank you.

  In this case, you will need to establish that if the change to the primary key makes sense - if so, you'll have to remove some lines to remove duplicates. I think that if this requirement has been raised at a request of the company, they will (should) have indicated what lines need to be maintained.

  If it is not sensible, you will need to go to the one who asked for the change and get them to change their mind or tell you what to do with duplicate lines.

  Out of curiosity, why did you change the primary key?

• COMPOSITE PRIMARY KEY

  Hi all
  
  I need mapping composite primary key to foreign key.
  
  Example:
  
  first create LOCATION_MASTER table with composite primary key,
  
  CREATE TABLE LOCATION_MASTER (LOC_CITYCODE VARCHAR2 (10))
  LOC_CITY VARCHAR2 (30),
  CONSTRAINT ANN_LOCMAS_PK PRIMARY KEY (LOC_CITYCODE, LOC_CITY)
  );
  
  Then create the route_master table. In the table route_master source_city, destination_city maps to loc_city
  
  CREATE TABLE ROUTE_MASTER (ROUTE_ID NUMBER (3),)
  SOURCE_CITY VARCHAR2 (30),
  DESTINATION_CITY VARCHAR2 (30),
  CONSTRAINT ANN_INPK PRIMARY KEY (ROUTE_ID).
  CONSTRAINT ANN_INFK FOREIGN KEY (SOURCE_CITY, DESTINATION_CITY)
  REFERENCES LOCATION_MASTER (LOC_CITY)
  );
  
  If I create like that, then I got error...
  
  The samething is my need. So please fix the code that I have attached.
  
  Please do what is necessary...
  
  
  
  Thank you
  Ann

  CONSTRAINT ANN_LOCMAS_PK PRIMARY KEY (LOC_CITYCODE, LOC_CITY)

  CONSTRAINT ANN_INFK FOREIGN KEY (SOURCE_CITY, DESTINATION_CITY)
  REFERENCES LOCATION_MASTER (LOC_CITY)

  It is not possible to refer to the part of the parent key. In your case, you must create a separate unique constraint on LOCATION_MASTER. LOC_CITY and then to establish referential constraints of ROUTE_MASTER. SOURCE_CITY and ROUTE_MASTER. DESTINATION_CITY individually i.e. two different referential constraints.

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  It take me 10 hours to charge the iPad. Kindly update there is no fault on iPad.

  It is difficult to know if there is anything wrong with the device, but it's more than twice as long it should take to recharge a weak battery on an iPad.  You charge the unit with cable, adapter and plugged into a wall outlet? You use while loading it and if you are, which applications (games) are you running?

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  Download and run Belarc Advisor, it will give you all kinds of information about your system, including some keys

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  If you are wanting to get into the BIOS, you can type the F10 key during startup.  You can find this information in the section of the manual under the illustrated parts and Service card.

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• Where and what are the registry keys for profiles

  Where and what are the registry keys for profiles. There is a new virus/malware, which is destroy the profiles. It is not only for machines XP, but all operating systems Windows which is destroyed.

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  ·         What is the antivirus installed on the computer program?

  You can run the Microsoft Safety Scanner to check the infection by the virus. Check out the following link.

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• What is the serial key and activation key for Microsoft professional win7 64 bit?

  Original title: WHAT IS THE SERIAL KEY AND ACTIVATION KEY TO PROFFESNIOL MS WIN7 64 BIT.

  ME TELL WHAT IS THE SERIAL KEY AND ACTIVATION KEY TO PROFFESNIOL MS WIN7 64 BIT

  REAL NAME = X 17 - 59186.iso

  ME TELL WHAT IS THE SERIAL KEY AND ACTIVATION KEY TO PROFFESNIOL MS WIN7 64 BIT

  REAL NAME = X 17 - 59186.iso

  You will need to buy a license to activate this copy of Windows 7 Professional. It doesn't have a product key, you will need to have that already.

  You can even buy an edition much cheaper if you like Home Premium, since it will be for domestic use.

  Because Windows 7 is in limited stock because Microsoft ended sales in October 2013, this created demand due to its rarity. This means the retail boxed copies request a bonus, while the OEM System Builder copies remain affordable.

  Full version (retail):

  -Includes the rights of transfer to another computer.

  -Does not require a qualifying earlier version of Windows.

  -Expensive

  Upgrade version (detail):

  -Includes the rights of transfer to another computer.

  -require a qualifying earlier version of Windows.

  -Expensive, but less expensive full version

  OEM System Builder version:

  The OEM of Windows 7 versions are identical to the versions commercial full license with the following exception:

  -OEM versions don't offer any free direct support from Microsoft technical support Microsoft

  -OEM Licenses are tied to the computer first you install and activate it on

  -OEM versions allow all hardware upgrades except for an upgrade to a different model motherboard

  -OEM versions does not move directly from an older Windows operating system

  There is nothing wrong to use it too, especially that all future versions of Windows will be full versions.

  Where can I still get Windows 7?

  Full version-

  Microsoft Windows 7 Home Premium

  Full version-

  Microsoft Windows 7 Ultimate

  Full version-

  Microsoft Windows 7 Professional

  Version upgrade-

  Microsoft Windows 7 Professional upgrade

  Version upgrade-

  Microsoft Windows 7 Ultimate Upgrade

  Version upgrade-

  Microsoft Windows 7 Home Premium Upgrade

  Family Pack:

  Microsoft Windows 7 Home Premium Upgrade Family Pack (3 users)

• What is the product key for Home premium Windows 7

  What is the product key for Home premium to Windows 7?

  Check the condition of the packaging which is where you will find the product key.

  If your computer is pre-installed with Windows 7, look for the COA sticker:

  COA certificate of authenticity:

  http://www.Microsoft.com/howtotell/content.aspx?PG=COA

  What is the certificate of authenticity for Windows?

  http://Windows.Microsoft.com/en-us/Windows7/what-is-the-Windows-certificate-of-authenticity