PL/SQL :: Foreign Key Can Be Implemented In One Table And Cannot Be Duplicated To Work
Oct 17, 2013
I have now created my tables and now I want to populate them with my data but I get errors below is my full sql command. From last time I learned that one foreign key can be implemented in one table and cannot be duplicated to work around this I changed my foreign key as you can see to "fkone" . but why am I getting errors when trying to add information I mean I have not gotten errors in the first two tables so what am I "doing wrong/ not understanding"
CREATE TABLE CUSTOMER (CUSTOMERNAME varchar (25),STREET varchar (25),CUSTOMERCITY varchar (25),CONSTRAINT CUSTOMER_pk PRIMARY KEY (CUSTOMERNAME)); CREATE TABLE DEPOSIT (CUSTOMERNAME varchar (25),BRANCHNAME varchar (25),ACCOUNTNUMBER int,BALANCE decimal (7,2),CONSTRAINT DEPOSIT_pk PRIMARY KEY (ACCOUNTNUMBER)); CREATE TABLE LOAN(CUSTOMERNAME varchar (25),BRANCHNAME varchar (25),LOANNUMBER int,AMOUNT decimal (7,2),CONSTRAINT LOAN_pk PRIMARY KEY (LOANNUMBER)); CREATE TABLE BRANCH (BRANCHNAME varchar (25),BRANCHCITY varchar (25),ASSETS decimal (7,2) ,CONSTRAINT BRANCH_pk PRIMARY KEY (BRANCHNAME)); ALTER TABLE DEPOSITadd
[code]....
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Aug 25, 2010
Create table Car
(Car_cd VARCHAR2(5),
Car_Desc VARCHAR2(50)
);
alter table Car
add constraint Car_PK primary key (Car_CD);
INSERT INTO Car (Car_Cd, Car_Desc) VALUES ('CORLA','COROLLA');
Commit;
[code]....
The requirement necessitates a new table to map car to manufacturer. This mapping table may later be expanded to contain other attributes Engine, MPG, etc to hold details specific to a car.But this is in future.
Create Table Car_Mapping_Details
(Car_Cd VARCHAR2(5),
Manufacturer_Cd VARCHAR2(5));
--Primary Key Constraint
ALTER TABLE Car_Mapping_Details
ADD CONSTRAINT Car_Mapping_Details_pk PRIMARY KEY (Car_Cd );
--Not able to create this as Car_cd is already a PK in this table and therefore has Unique Index
ALTER TABLE Car_Mapping_Details ADD CONSTRAINT Car_Mapping_Details_fk1
FOREIGN KEY (Car_Cd)REFERENCES Car (Car_Cd);
[code]....
But in this case the Car_Mapping_Details.Car_cd is itself is a primary key and therefore has Unique index.Although I was able to create foreign key constraint on Car_mapping_details.car_cd column (which is also Primary Key), I was not able to create Foreign Key Index on this column. It gives me Quote:ORA-01408: such column list already indexed.In other words, not creating foreign index for foreign key column lead to table-level lock? Or will the Unique Index in that primary key column be sufficient to avoid table-level lock?
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Mar 18, 2010
the query, to get the foreign key constraints and related table fro give table.
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Jul 29, 2011
I have two forms, A and B and form A is calling form B. And when I am committing form B I am getting this error message. I don't want to commit form A before committing form B. Is their any solution to commit both forms in different session.
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May 3, 2013
in a table how many foreign keys can we create.
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Jan 11, 2012
There are 2 tables : Table A and Table B.Table B has foreign key reference to Table A.There are 2 forms in the application based on table A (form 1) and table B (form 2).
Now when we open form 2, the functionality is such that it acquires a lock on table B for the selected record during the search criteria. Lock is acquired by using "select 1 from table_B where column = :column for update no wait".So when the form 2 is opened by any other user/session and same record is tried to be selected, then an exception is raised to the user that the current record is being edited by some other user and does not allow him to edit that record.
Now imagine if User has opened screen 2 (One record in Table B has been locked). With this lock existing, we open form 1, and click a button which performs a COMMIT_FORM. At this point the form hangs. On checking the locked objects, there is a lock on both table A and table B. When the Form 2 is closed, then the Form 1 which was hanging a while ago starts responding.
When the foreign key relationship is dropped and the above scenario is tried, there is no issue encountered. Form 1 works fine even if form 2 is open.We are not supposed to drop the Foreign key relationship as well.
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Jan 26, 2010
My server RAM is 12GB. i installed 10gr2 and implemented /3GB also. Eventhough my database is giving problem.
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Jan 21, 2012
I have an employee table which has a primary key and a self referencing foreign key, as shown here
create table employee (
id not null,
name not null,
department not null,
supervisor_id not null
,constraint constraint_1 primary key (id)
,constraint constraint_2 foreign key (supervisor_id) references employee (id));
Now if i make the primary key composite, as shown below -
create table employee (
id not null,
name not null,
department not null,
supervisor_id not null
,constraint constraint_1 primary key (id, name)
,constraint constraint_2 foreign key (supervisor_id) references employee (id));
Oracle is throwing the following error -
ORA-02270: no matching unique or primary key for this column-list
How can this error be fixed without changing the composite primary key?
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May 29, 2011
I need to implement the foreign key on a column of a table from 2 tables. My requirement is in bellow.
drop table t1;
create table t1 (slno number, acc_no number);
drop table t2;
create table t2 (acc_no number primary key, acc_name varchar2(100));
drop table t3;
create table t3 (acc_no1 number primary key, acc_name1 varchar2(100));
[code]...
It is provided that the values of acc_no in t2 and acc_no1 in t3 are unique.Now it required that while inserting into t1 , the system will check either t2 or t3 tables.
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Feb 17, 2013
which data dictionary should i choose to see the foreign key and primary key of table
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May 9, 2013
i have a field in my table office i got field office_code ,this field is been used in diffirent tables as foreign key is there a sql i can wirte to see all tables who have used this field as foreign key.
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Mar 11, 2011
I have created table as below
create table emp_temp as select * from emp;
the table is created, but the constraints are not copied. Is there any way to copy all the constraints.
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Dec 20, 2012
Am creating a table based on some integrity constraints, but it's not working.
CREATE TABLE member
(
member_id NUMBER(10),
last_name VARCHAR2(25) NOT NULL,
first_name VARCHAR2(25),
[code],,,
Error:
Error report:
SQL Error: ORA-02270: no matching unique or primary key for this column-list
02270. 00000 - "no matching unique or primary key for this column-list"
*Cause: A REFERENCES clause in a CREATE/ALTER TABLE statement gives a column-list for which there is no matching unique or primary key constraint in the referenced table.
*Action: Find the correct column names using the ALL_CONS_COLUMNScatalog view
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Nov 28, 2012
I have table with 4 partition by range partition. I am loading the table in bulk mode to latest partition. Before I load , I dropped the index and after Load I will be creating index. So when I am dropping index, it is dropping index from all the partitions and when creating the index, I am creating the index for all partitions. When I am creating index using local, it is telling you have to create local index for all partitions at the same time. because of that I have to drop and recreate all indexes again. Again I have to gather stats for whole table .
I was thinking we can build index for one partition and index should remain as is for old partitions If this is not the case, how do I plan my load for a partitioned table using bulk mode to latest partition.
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Jan 11, 2011
It shows me error when i create a table with column name as UID.
Is UID a inbuilt function or anything else?
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Aug 9, 2010
I'm having table like this:
deptno
10
10
20
20
30
40
my query isI need the records which are not duplicated.
my output must have the records 30 and 40 only.
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May 21, 2010
I want to delete the duplicated record using following methods, it delete the records if all the record are matched according to condition, but if all records are not matched then it display error messages.
SQL> SELECT * FROM XYZ;
NAME FNAME ADDRESS JOB
-------------- -------------------- -------------------- -----------------------------------------
Bilal Khan Wali your rehman name district abbottabad student
Bilal Khan Wali your rehman name district abbottaba student
Bilal Kh Wali your rehma name district abbotta studen
Bilal K Wali your rehm name district abbotta studen
Bilal Khan Wali your rehman name istrict abbottaba tudent
lal Khan i your rehman name strict abbottaba tudent
[code]....
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Sep 7, 2013
I totally realize that but here is what im trying to accomplish. I have a table with one column that repeats.the table looks like this.
create table testCheck (check_num varchar2(20), amount number(17,2), invh_Code varchar2(20))
and it has data like so
INSERT INTO "TESTCHECK" (CHECK_NUM, AMOUNT, INVH_CODE) VALUES ('001', '50', '1123')
INSERT INTO "TESTCHECK" (CHECK_NUM, AMOUNT, INVH_CODE) VALUES ('001', '50', '1123')
INSERT INTO "TESTCHECK" (CHECK_NUM, AMOUNT, INVH_CODE) VALUES ('002', '100', '1234'
I would like to write a query that would give me the distinct check_num's but put an asterisk on the items that are actually duplicated.so in other words expected result in this case would look like this.
"CHECK_NUM" "AMOUNT" "INVH_CODE"
"001*" 50 "1123"
"002" 100 "1234"
I've been able to get as far as getting the unique values but what i cant do is figure out for the life of me how to put the asterisk in there.here is my query.
with Checkquery as (
SELECT count(*) over (partition by CHECK_NUM order by CHECK_NUM ROWS UNBOUNDED PRECEDING ) thiscount, CHECK_NUM, AMOUNT, INVH_CODE
FROM TESTCHECK
group by
check_num,
AMOUNT,
INVH_CODE)
select check_num, amount,invh_Code from Checkquery where thiscount ='1';
I simply want to identify the dups put an asterisk on the record and then only select one of the records.
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May 26, 2010
I'm having problem with my database, which contains more than 1 rows with a same value on a field that has uniqueness contraint.
Here is the log from sqlplus. When I select on RI field, it shows 2 rows. But when I select on SCNUM field, it shows only 1 row. This SCNUM has an unique index on it.
And it is still in VALID state
SQL> set autotrace on
SQL> select ri, scnum from scratch1_p where ri in (536964983, 536955574);
select ri from scratch1_p where scnum='444393975';
RI SCNUM
---------- ----------
536955574 444393975
[code].....
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May 15, 2013
Re: Report Columns duplicated when region is copied.
When I copy a region which I have created via master-detail form, the report columns are duplicated. I'm actually copying the whole page but I have had other cases where I just copying the desired region and the columns were duplicated there as well. And, of course, there is no way that I know to delete columns from the form. But I doubt because -- in at least some cases I've tried -- the columns seems to be "linked" in that a change to one copy of the column was duplicated in the other when changes were applied.
In the example (below), there are three regions on the page and the problem occurs in region 2. (I think I will likely delete the first region.) It's been agonizing trying to get the report of region 2 and the tabular formish edits of region 3 on the same page. I made this in Oracle 11.2 in our APEX 4.1 and imported it to 4.2. You can see it here:
WS apex_examples_01
demo
demo
Appl. 991204
Page 57 is the original page created in 4.1 and imported
Page 58 is the page copied from 57 under 4.1 and imported
Page 59 is the page copied from 57 under 4.2 (Same result as in 4.1.)
If you want to try the page, select DSD01 from the DSD LOV, click "Query Process" and then click the edit icon. Ignore the region 1 errors -- I'll probably delete this region. The data is region 3 is for Run Date 12-May-13.
Is there some setting that allows this region to be copied without duplicating columns?
P.S. I think I know why it happens: APEX hates me!
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Dec 10, 2010
Why duplicated rows when a PK is present running Sqlldr?
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Nov 7, 2011
if have table primary key in this table empno and another table foreign key is empno and when add in the primary key 5522 how can
5522 in the empno "foreign key" automatic
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Jul 26, 2011
I have an already populated table that refers to a wrong foreign key in another table. I have table abc that has the column fk_id. this column currently refers to column x_id1 in the table abc while it should refer to column x_id2 in xyz. I am trying to replace the data but I guess I miss something in the logic or the right way of doing it:
following is my trial:
create table abc
(
pk_id number(4) primary key,
abc_name varchar2(10),
fk_id number(4)
);
create table xyz
(
x_id1 number(4),
x_id2 number(4),
x_name varchar2(10)
);
commit;
insert all
into abc values (10,'ab1',1)
into abc values (11,'ab2',2)
into abc values (12,'ab3',5)
into abc values (13,'ab4',7)
into abc values (14,'ab5',9)
into xyz values (1,1,'d1')
into xyz values (2,2,'d2')
into xyz values (5,3,'d3')
into xyz values (7,4,'d4')
into xyz values (9,5,'d5')
select * from dual;
commit;
--this following select returns 5 rows
select * from abc, xyz where abc.fk_id = xyz.x_id1;
-- the following update only updates 3 rows and sets the other 2
-- to null!
update abc set fk_id = (select x_id2 from xyz where xyz.x_id1 = abc.fk_id);
commit;
select * from abc;
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Dec 4, 2011
I'm not really sure why oracle is not finding my Foreing Key, I'm creating an easy set of table for a company and I'm declaring all Primary keys and foreing keys as necessary and this is my
CREATE TABLE Items
(ItemID NUMBER(5) NOT NULL,
Description VARCHAR2(30),
ListPrice NUMBER(9,2) NOT NULL,
QtyOnHand Number(5),
ReorderPoint NUMBER(3),
ReorderQty NUMBER(3),
OnBackOrder Number(3),
CONSTRAINT ItemsPK
[Code] ............
There's three sets of inserts the first two successfully inserts the data NO problem but when i try to insert the data on SupplierItems comes as:
ERROR at line 1:
ORA-02291: integrity constraint (jcarter.SUPPLIERITEMSFK2) violated - parent key not found
I looked on the forum and it appears this happens when someone is doing a Insert ALL but this is not my case..
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Feb 3, 2012
I have a parent table called dept and one child table emp which is referenced on deptno and now both have data . Now i want to truncate the dept table and i have truncated emp table after it when i am trying to truncate dept table then oracle throws a error that is-
"ORA-02266: unique/primary keys in table referenced by enabled foreign keys" ,
but when i tried to delete some records 1 by 1 then these have delete but truncate is not still working. why? if i have 10 millon records.
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Mar 13, 2013
You should almost always index foreign keys because they are frequently used in joins. In addition, if you intend to delete or update unique or primary keys on the parent table, you should index the foreign keys to improve the locking of child records.what I don't understand are, I should create index on foreign key column in parent table or child table or both ?
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Sep 6, 2011
Is there any view in oracle which gives the foreign key mapping.
E.g.
Table DEPT has DEPTNO as PK.
Table Emp has DEPTNO as FK to DEPT.DEPTNO.
I can get the information for DEPT table from R_CONSTRAINT_NAME column of all_constraints table.My requirement is to get the the which column of Emp table refers to DEPT.DEPTNO column .
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Sep 1, 2013
Say we have an employee(id_emp) table with a primary key on id_emp. We have also some history tables emp_stuff with columns say (id_emp, dat_event, some_stuff) with primary key id_emp, dat_event.
This means that we have a unique index on (id_emp,dat_event). We also have a foreign key id_emp that references employee(id_emp). When we update id_emp on employee, we still have a lock on emp_stuff. According to this (end of the page) :
Quote:So, in short, with releases prior to Oracle Database 11g Release 1, you will want an index on the foreign key of the child table if you do any of the following:
Update the parent table primary key
Delete from the parent table
Merge into the parent table
So is id_emp in emp_stuff considered as indexed (through the unique index of the primary key) or do we have to add an explicit index
like this CREATE INDEX emp_stuff ON emp_stuff(id_emp) to avoide child table locks?
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May 2, 2012
I am trying to establish PK-FK relationship between 2 tables. Table 1 has VACC_ID as a primary key. Table 2 has VACC_ID and SCH_ID as the primary keys. I am trying to add VACC_ID from Table 2 as a FK to Table 1. This is the code I used
ALTER TABLE Table_1
ADD CONSTRAINT FK_VACC_ID
FOREIGN KEY (VACC_ID)
REFERENCES Table_2(VACC_ID)
I also tried to add it without writing the query and editing the Table 1. By default, I am getting 2 columns(both VACC_ID) in the local column being referenced to the 2 primary keys(VACC_ID and SCH_ID) of table 2. I also uploaded the screeshot of the error, when I run the query.
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Jul 13, 2010
the view from where we can fetch information for a foreign key viz. reference table, referenced columns etc.
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