primary key for a table with only 1 column

Similar Questions

• How to add the primary key for the table with the existing data?

  The table is already busy data. There was no primary key before, so for each column, there are some duplicate values.
  
  I want to add a new column, which should be of the integer data type and can automatically incremented, from 001. I tried with Oracle SQL Developer, but it says "ORA-01758: table must be empty to add mandatory (NOT NULL) column. How can I do? Thank you!

  Hello

  Look for the [ALTER TABLE | http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_3001.htm#sthref4803] command to find out how to add a column (step (1)) and a (step (3)) constraint to an existing table.

  For the step (2):

  CREATE SEQUENCE  employee_id_seq
  START WITH  1
  ;
  
  UPDATE  employee
  SET     id  = employee_id_seq.NEXTVAL;
  

  When you create a sequence, START WITH 1 is the default value, so that the line is not really necessary above... I've included just to show how you could start with any number you have chosen.

• primary key for the table

  I have a Gr_order table that was settled long ago, and now he needs to be filled
  with some more search data.
  
  "Orderid" is a primary key for the table, but the question is how can I insert "orderid" in the insert statement in the procedure. I couldn't find any name sequence. There are 1230
  documents that must be inserted.
  

  Desc Gr_order
  Orderid  Number Primary key
  Desc     Varchar2

  INSERT INTO gr_order (orderid,desc)  
  VALUES (???, upper(each_pom.desc);

  Thank you
  Sandy

  You can find the code that inserts into the table and see if it uses the sequence ;-). A sequence is not 'attached' to a particular table - this is the insert statement to determine whether a sequence should be used.

  You can check if the table has a trigger - some developers like to emulate the behavior of MS - sql server by having a trigger on the table that selects in a sequence. If it has such a release, then you just do your insertions without specifying order_id. But if the table does not have such a release, then you cannot know if the table was originally filled using a sequence or not (unless you can find the instructions for inserting somewhere).

• Two constraints of primary key of a table with two different constraint name

  Hi guys

  I am creating the table below

  Table name: TITLE_COPY

  Column name	Copy_id	Title_id	Status
  Key type	PK	PK, FK
  Unique	NN, U	NN, U	NN
  Check			Available, destroyed, leased, reserved
  Table Ref FK		Title
  FK Ref Col		Title_id
  Data type	Number	Number	Varchar2
  Length	10	10	15

  The SQL statement below can create it

  CREATE TABLE title_copy (copy_id NUMBER (10),)

  title_id CONSTRAINT NUMBER (10) title_copy_title_id_fk title (title_id) REFERENCES.

  primary key constraint title_copy_title_id_pk title_id (copy_id)

  status VARCHAR2 (15) NOT NULL CONSTRAINT status_ck CHECK (status IN ('AVAILABLE', 'DESTROYED', 'RENTAL', 'RESERVED'))

  );

  Two primary keys (title_id, copy_id) are created with the same name of constraint (title_copy_title_id_pk) (-> table-level constraint). What happens if I want to have two different names of the primary key constraint, say title_copy_title_id_pk for the title_id column and title_copy_copy_id_pk for the copy_id column?

  I can do that with a column-level constraint? Something like below (complains about the additional primary key)

  CREATE TABLE title_copy (copy_id NUMBER (10) CONSTRAINT title_copy_copy_id_pk PRIMARY KEY,)

  constraint title_copy_title_id_pk primary key (title_id).

  title_id CONSTRAINT NUMBER (10) title_copy_title_id_fk title (title_id) REFERENCES.

  status VARCHAR2 (15) NOT NULL CONSTRAINT status_ck CHECK (status IN ('AVAILABLE', 'DESTROYED', 'RENTAL', 'RESERVED'))

  );

  In summary, I can define two primary keys with the name of different constraint in a column-level constraint?

  There are no two primary keys. There is a primary key made up of two columns - also called a composite key.

  A table can have at least a primary key. You can, if you wish, create a unique constraint on a different set of columns.

• How to define a Composite primary key for a Table

  Hello
  
  I'm basically more in Java programming, with little knowledge of Oracle bit as DataBase .so please sorry for my silly doubts.
  
  Can someone tell me please how to define a Composite primary key on a Table.
  
  Thanks in advance.
  
  Published by: user672373773 on 25 Sep, 2009 08:54

  Please go through these links:

  http://plsqlworld.blogspot.com/2009/01/oracleplsql-composite-primary-key.html

  http://sqlzoo.NET/HOWTO/source/z.dir/tip241027/Oracle

  Concerning
  Asif Kabir

  -Mark the response as correct/good

• Primary key for the Table is

  Hello guys,.
  
  I have a question about the primary key in my fact table. In my fact table, the primary key is a combination of 3 different columns, 2 columns are primary keys in dimension tables 2 diff. Is it normal to have a primary key in a table of facts, which is a combination of 3 different columns. If yes then when us will be important to the OBI tool only 3 columns Phy layer appears as the PK. should I do the other 2 columns as the PK in the physical layer of the OBI tool or can I leave it as it is. Please let me know
  
  Thank you.

  I did as you asked me to. Can you let me also know what will happen if I do only a single key as PK and let them other 2 touch as it is. This will affect performance in > is it possible or will I get incorrect values?

  No, this will not affect anything, in any case explicitly will give you joined him again in the physical layer.
  But it is advisable to show the key columns in the physical layer of the RPD.

  Thank you
  Vino

• Change of primary key on the Table clears the other columns

  Preliminary info/Installation
  JDeveloper 11 g 11.1.1.6.0
  We have a table (object view or entity) that has 8 columns. The primary key is composed of 4 1 columns.
  The table is displayed in a page fragment.
  2 of the 4 non-primary key columns are LOV.
  All the 8 columns are needed.
  The table is editable including 2 of primary key columns.
  
  Question
  Assume that the table displays the 3 lines. If we change a rank 1 non-primary key column and a primary key in row 2 column, everything works well when we are committed to the database
  If, however, we first change a primary key column, then a primary key on a different line column, then the column/row primary key that changed us first, gets annihilated and the other columns LOV on this same line. The 2 columns that are not LOV keep data as it should. We then get a validation error because the required data are not present. All this happens before we try all commit to the database. If debug us and look the iterator, it has the old data in this document, before and after any performance on the binding.
  If we look at and update the data via the App Module, everything works well. We have tried to update the view, etc. through valueChangeListener also with no luck.

  If you change the primary key value, it should not be the primary key.

  This is true in the design of database relational regardless of how access you the data. In addition, EO don't like if you change the primary key value.

  Have you considered adding a surrogate key (use a sequence) and make your PK course a unique key?

  John

• Why we cannot create more than one primary key on a table. Why we create several unique key on a table. Please explain if anyone have details of this.

  Why we cannot create more than one primary key on a table. Why we create several unique key on a table. Please explain if anyone have details of this.

  «a primary key has semantic meaning, it is to be immutable (never change of value), unique and not null.»

  a unique constraint is simply "at any time, these values are unique - they can change and they can be null.

  You use a unique when constraint

  (a) you do not already have a primary key for a table can have only one
  (b) you allow NULL values in attributes
  "(c) to allow you to update the values in the attributes.

  https://asktom.Oracle.com/pls/Apex/f?p=100:11:0:P11_QUESTION_ID:5541352100346689891

• primary key for a column made up of duplicates

  Hello
  -> I have created a table and
  -> I have a column consisting of 1,000 records (but where I have duplicates)
  
  and now, I want to create a primary key for the column
  How can I do it...

  Hello

  Run the utlexcpt.sql script located in the ORACLE_HOME/rdbms/admin directory level to create the exception table.

  Thank you

• a key for the table does not exist in the table

  Hi guys,.
  
  I imported several tables of physical layer in the administration tool. So, I want to do new foreign key between tables join in the physical schema.
  Required fields for posting a link between these tables are set up. When I press the ok button, an error message is displayed:
  "a key corresponding to the table does not exist in the table blablabla. You want to create a? »
  
  In fact, what is this error? I don't have all the idea about it. The number of the type of the fields is the same, the names are also the same. I think that he should not have problems to make the new foreign key. But why is it happening?
  
  Thank you

  Hello

  It is the primary key of the first table. You might not have set this column as the primary key of this table at the level of the db.

  Thank you
  Imtiaz.

• Two foreign keys of a table in a single column

  Hi gurus

  I wonder that can we add two foreign keys of a table on a single column, I think the answer is, but what should be the reason behind this?

  Appreciate if someone there explain to me...

  Concerning

  Muzz

  Hello Muzz,

  Perhaps the example of human Chen reveals a design error.
  If a student has a 'teacher_id' "teacher" FK and FK for "emp" becaue each teacher is an EMP, I guess that the correct design would be to have only the FK of 'teacher' and to have another pointing to the 'emp' table in the 'teacher' tabe FK

  But we can imagine comical situations...
  CREATE TABLE PEOPLE (id NUMBER of KEY PRIMARY, name VARCHAR2 (20 CHAR),...);
  CREATE TABLE SCIENTIST (id people KEY PRIMARY NUMBER (id) REFERENCES, discipline VARCHAR2 (20 CHAR),...);
  CREATE TABLE POLICEMAN (id REFERENCES to KEY PRIMARY NUMBER (id), hire_date people DATE,...);

  First table = all.
  2nd: a subset of the first, with people having the profile of 'scientific '...
  3rd: a subset of the first, with people being a policeman.
  It might be people first table and in none of the 2nd and 3rd, 1st and 2nd, 1st and 3rd only or in the 3 tables.

  Then we can have a fourth table of 'something' referring to a person who must be a scientist and a police officer.

  Here is a sqlplus session illustrating; the last piece: I try inserting several lines in xxxx, only the last is accepted.

  SQL > CREATE TABLE PEOPLE (id NUMBER of the PRIMARY KEY, name VARCHAR2 (20 CHAR));
  Table created.

  SQL > CREATE TABLE SCIENTIST (people of REFERENCES of KEY PRIMARY NUMBER id (id), discipline VARCHAR2 (20 CHAR));
  Table created.

  SQL > CREATE TABLE POLICEMAN (people of REFERENCES of KEY PRIMARY NUMBER id (id), DATE hire_date);
  Table created.

  SQL > CREATE TABLE XXXX (id PRIMARY KEY NUMBER, people_id NUMBER, any other VARCHAR2 (30 CHAR));
  Table created.

  SQL > ALTER TABLE ADD CONSTRAiNT fk_xxsci FOREIGN KEY (people_id) scientific xxxx REFERENCES (id);
  Modified table.

  SQL > ALTER TABLE ADD CONSTRAiNT fk_xxpol FOREIGN KEY (people_id) police xxxx REFERENCES (id);
  Modified table.

  SQL > INSERT INTO person VALUES (100, 'John');
  1 line of creation.

  SQL > INSERT INTO person VALUES (120, 'Mary');
  1 line of creation.

  SQL > INSERT INTO person VALUES (103, 'Tom');
  1 line of creation.

  SQL > INSERT INTO person VALUES (123, "Bruno");
  1 line of creation.

  SQL > INSERT INTO VALUES of scientific (120, 'Chemistry');
  1 line of creation.

  SQL > INSERT INTO scientific VALUES (123, 'Mathematics');
  1 line of creation.

  SQL > INSERT INTO VALUES of policeman (103, DATE ' 2001-04-01');
  1 line of creation.

  SQL > INSERT INTO VALUES of policeman (123, DATE ' 1998-07-01');
  1 line of creation.

  SQL > INSERT INTO xxxx VALUES (1, 456, "nothing");
  ERROR on line 1:
  ORA-02291: integrity constraint (SYS. FK_XXPOL) violated - key parent not found

  SQL > INSERT INTO xxxx VALUES (1, 100, "only to people");
  ORA-02291: integrity constraint (SYS. FK_XXPOL) violated - key parent not found

  SQL > INSERT INTO xxxx VALUES (1, 120, "only the learned");
  ORA-02291: integrity constraint (SYS. FK_XXPOL) violated - key parent not found

  SQL > INSERT INTO xxxx VALUES (1, 103, "only police officer");
  ORA-02291: integrity constraint (SYS. FK_XXSCI) violated - key parent not found

  SQL > INSERT INTO xxxx VALUES (1, 123, 'ok');
  1 line of creation.

  Best regards

  Bruno Vroman.

• How to create a table with two unique columns

  How to create a table with two unique columns. I use the following syntax below and I get the error message such unique or primary key already exists.
  
  create the table COPQ_WORKCELL_GOAL
  (
  Type_id varchar2 (4) NOT NULL UNIQUE,
  Tyle_Location varchar2 (30) NOT NULL UNIQUE,
  Type_Description varchar2 (20).
  KEY elementary SCHOOL (Type_id)
  );

  Use 1 or the other column type_id;

  create table COPQ_WORKCELL_GOAL
  (
    Type_id varchar2(4),
    Tyle_Location varchar2(30) NOT NULL UNIQUE,
    Type_Description varchar2(20),
    PRIMARY KEY (Type_id)
  );
  
  Table created
  drop table COPQ_WORKCELL_GOAL;
  
  Table dropped
  create table COPQ_WORKCELL_GOAL
  (
    Type_id varchar2(4) primary key,
    Tyle_Location varchar2(30) NOT NULL UNIQUE,
    Type_Description varchar2(20)
  );
  
  Table created
  

• Importing data with impdp table with 3 new columns

  Hello

  Is it possible to import data with impdp in tables with 3 new columns?

  Kind regards

  William

  To do this, I use this method:

  Add the three columns in the source table and create the package:

  CREATE OR REPLACE PACKAGE DATAPUMP_TECH_COLS

  IS

  FUNCTION SET_DML_DATE (p1 in TIMESTAMP)

  BACK TO TIMESTAMP;

  FUNCTION SET_DML_TYPE (p2 in VARCHAR2)

  RETURN VARCHAR2;

  FUNCTION SET_DML_SCN (p3 in NUMBER)

  RETURN NUMBER;

  END DATAPUMP_TECH_COLS;

  /

  CREATE OR REPLACE PACKAGE BODY SYS. DATAPUMP_TECH_COLS

  IS

  FUNCTION SET_DML_DATE (p1 in TIMESTAMP)

  RETURNS THE TIMESTAMP

  IS

  BEGIN

  SYSDATE RETURN;

  END;

  FUNCTION SET_DML_TYPE (p2 in VARCHAR2)

  RETURN VARCHAR2

  IS

  BEGIN

  RETURN ' ';

  END;

  FUNCTION SET_DML_SCN (p3 in NUMBER)

  RETURN NUMBER

  IS

  BEGIN

  RETURN 0;

  END;

  END;

  /

  Export a table with remap_data

  expdp = TEMP_DIR PARALLEL = 8 TABLES directory is PIVOTMAT2. ACCTG_LINE LOGFILE = expdp_acctg.log = COMPRESSION STATISTICS ALL EXCLUDE =.

  DUMPFILE = ACCTG1.dmp, ACCTG2.dmp, ACCTG3.dmp, ACCTG4.dmp, ACCTG5.dmp, ACCTG6.dmp, ACCTG7.dmp, ACCTG8.dmp REUSE_DUMPFILES = YES.

  REMAP_DATA = PIVOTMAT2. ACCTG_LINE. DML_TYPE:SYS. DATAPUMP_TECH_COLS. SET_DML_TYPE.------

  REMAP_DATA = PIVOTMAT2. ACCTG_LINE. DML_DATE:SYS. DATAPUMP_TECH_COLS. SET_DML_DATE.------

  REMAP_DATA = PIVOTMAT2. ACCTG_LINE. DML_SCN:SYS. DATAPUMP_TECH_COLS. SET_DML_SCN

  Import table

  Impdp "" / as sysdba "" DIRECTORY = SRC_PIVOT TABLE_EXISTS_ACTION = TRONQUER REMAP_SCHEMA = PIVOTMAT2:STGPIV.

  DUMPFILE = ACCTG1.dmp, ACCTG2.dmp, ACCTG3.dmp, ACCTG4.dmp, ACCTG5.dmp, ACCTG6.dmp, ACCTG7.dmp, ACCTG8.dmp PARALLEL = 8

  to complete the removal of the collar if necessary.

• Primary key for tables

  Hi guys,.
  
  I had a simple order form when you add products.
  
  So I had 2 tables, ORDER (order_id, order_date) and ORDER_ITEMS (order_id, product_id, product_qty)
  
  My ORDER_ITEMS are added through tabular form
  

  select * from ORDER_ITEMS WHERE ORDER_iD = :P21_ORDER_ID;

  I can't create a 1 time order, as I create the ORDER first to get the primary key to add to ORDER_ITEM. I tried the Return key in point and placed the DML above the ApplyMRU process. But no luck.
  
  THE P21_ORDER_ID is display only save session state.
  
  Bit at a loss how to create both and to order and add its items in a single time instead of creating the order first then order items. Anyone know how I can accomplish this?
  
  Return key point seems to be the solution for this but I can't get it to work. Thank you very much.

  Take a look at your request, I changed the driver to the new process page, products and create an order which returns the primary key. Now you can create the initial product registration with in the process. do not disable the multirow process that always allows you to add or update records.

• How to specify the tablespace for a India primary key in create table statement

  How to specify the storage space for a primary key index in a create table statement?
  Does the following statement is true?

  CREATE TABLE 'GPS'||TO_CHAR(SYSDATE+1,'YYYYMMDD')
              ("ID" NUMBER(10,0) NOT NULL ENABLE, 
              "IP_ADDRESS" VARCHAR2(32 BYTE), 
              "EQUIPMENT_ID" VARCHAR2(32 BYTE), 
              "PACKET_DT" DATE, 
              "PACKET" VARCHAR2(255 BYTE), 
              "PACKET_FORMAT" VARCHAR2(32 BYTE), 
              "SAVED_TIME" DATE DEFAULT CURRENT_TIMESTAMP, 
               CONSTRAINT "UDP_LOG_PK" PRIMARY KEY ("ID") TABLESPACE "INDEX_DATA"
               )            
               TABLESPACE "SBM_DATA";   

  Thank you
  
  Published by: qkc November 9, 2009 13:42

  As orafad noted, you can use the documentation using ESCALATION clause, i.e.

  SQL> ed
  Wrote file afiedt.buf
  
    1  CREATE TABLE GPS
    2              ("ID" NUMBER(10,0) NOT NULL ENABLE,
    3              "IP_ADDRESS" VARCHAR2(32 BYTE),
    4              "EQUIPMENT_ID" VARCHAR2(32 BYTE),
    5              "PACKET_DT" DATE,
    6              "PACKET" VARCHAR2(255 BYTE),
    7              "PACKET_FORMAT" VARCHAR2(32 BYTE),
    8              "SAVED_TIME" DATE DEFAULT CURRENT_TIMESTAMP,
    9               CONSTRAINT "UDP_LOG_PK" PRIMARY KEY ("ID") USING INDEX TABLESP
  ACE "USERS"
   10               )
   11*              TABLESPACE "USERS"
  SQL> /
  
  Table created.
  

  Justin