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oracle get tables that reference given primary key value


oracle get tables that reference given primary key value

By : user2953814
Date : November 21 2020, 07:31 AM
I wish did fix the issue. I don't think any data dictionary view is available for achieving your goal but you should need to create procedure or function to achieve this goal. Without this you cannot get result of PK value AGENCY_ID (i.e. 1004) referenced or not if referenced then how many times.
code :


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In Oracle, how would I begin to create the tables when all the needed tables have both foreign and primary key constrain

In Oracle, how would I begin to create the tables when all the needed tables have both foreign and primary key constrain


By : jaryal
Date : March 29 2020, 07:55 AM
I wish this help you You can declare the foreign key constraint to be DEFERRABLE, which allows you to have Oracle check the constraint at the end of a transaction.
code :
SET TRANSACTION;
    SET CONSTRAINTS ALL DEFERRED;
    INSERT INTO TABLE_ONE (PK1, FK2, NAME)
        VALUES(10, 20, 'Foo');
    INSERT INTO TABLE_TWO (PK2, FK3, NAME)
        VALUES(20, 30, 'Bar');
    INSERT INTO TABLE_THREE (PK3, FK1, NAME)
        VALUES(30, 10, 'Baz');
COMMIT;
SQL. How to reference a composite primary key Oracle?

SQL. How to reference a composite primary key Oracle?


By : Marytyl
Date : March 29 2020, 07:55 AM
To fix the issue you can do I have two parent tables: Treatment and Visit.
code :
 CONSTRAINT fk_column
 FOREIGN KEY (column1, column2, ... column_n)
 REFERENCES parent_table (column1, column2, ... column_n)
create table Visit_Treat (
TreatCode CHAR(6) constraint cTreatCodeFK references Treatment(TreatCode),
SlotNum NUMBER(2),
DateVisit DATE,
constraint cVisitTreatPK primary key (SlotNum, TreatCode, DateVisit),
constraint fk_slotnumDatevisit FOREIGN KEY(SlotNum,DateVisit) 
references Visit(SlotNum,DateVisit)
);
Oracle PL/SQL Why do we need Primary and Foreign Key in tables

Oracle PL/SQL Why do we need Primary and Foreign Key in tables


By : user2437997
Date : March 29 2020, 07:55 AM
hop of those help? Primary keys are used to uniquely identify each record in a table. Foreign keys in a table uniquely identify a whole row in another table.
Composite Primary Key XOR reference of 3 tables

Composite Primary Key XOR reference of 3 tables


By : Italo
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further As far as I know there are no constraints available in MySQL to enforce that only companies xor accountants is referenced.
However, you could use BEFORE INSERT and BEFORE UPDATE triggers to intercept values that could violate the constraint, and modify them; perhaps setting both references to null, favoring one over the other, setting some "attention required, bad entry" field, etc...
Oracle SQL : Why cant each foreign key from separate tables reference to a single primary key?

Oracle SQL : Why cant each foreign key from separate tables reference to a single primary key?


By : agunesse
Date : March 29 2020, 07:55 AM
it fixes the issue The problem, as @OldProgrammer and others suggest is that you're trying to use the same constraint name in both cases. You'd need to use different constraint names. You'll probably want to use some sort of naming convention for your keys-- I prefer one that uses both the parent and the child in the name. So I'd do something like
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