1. id serial primary key,
2. password VARCHAR (50) NOT NULL,
3. date_of_birth date not null
4. id serial primary key,
5. );
6. create table accountRole(
7. ID_role integer NOT NULL,
8. FOREIGN KEY (ID_role) REFERENCES role (id) ON DELETE CASCADE,
9. FOREIGN KEY (ID_account) REFERENCES account (id) ON DELETE CASCADE
10. id serial primary key,
11. );
12. create table collection(
13. collection_name varchar(100) not null,
14. id_account integer references account (id) ON DELETE CASCADE,
15. id_category integer references category (id) ON DELETE CASCADE
16. id serial primary key,
17. id_collection integer references collection (id) ON DELETE CASCADE
18. id serial primary key,
19. comment varchar(300),
20. id_deck integer references deck (id) ON DELETE CASCADE

1. Primary Key

I have a question related to two oracle tables having only 2 columns each and one is primary key and another is foreign key . How do i inset the data in both tables. This was more of a discussion between our friends and we were not able to get the answer. I goggled it but could not get any proper answers. So i thought experts here can give some suggestions.

Table A
Columns :- X (Primary Key), Y (Foreign Key to Table B's M column)

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Yes, when a primary key is created an index for that column is automatically created. The reason why there is primary key is to enforce data integrity. If the rules of normalization is always to follow the relationship between tables should co-exist then this is where the primary key and foreign key comes to the picture. Introduction to SQL foreign key constraint A foreign key is a column or a group of columns that enforces a link between the data in two tables. In a foreign key reference, the primary key column (or columns) of the first table is referenced by the column (or columns) of the second table. The Foreign key is for referential integrity, but doesn’t necessarily have to be, because any uniqueness of a column can connect and you don’t have to have a Primary key either, but cluster indexing (having a Primary key) speeds up the connection, because clustering is directly in memory. Foreign key is a field in the table that is Primary key in another table. Foreign key can accept multiple null value. Foreign key do not automatically create an index, clustered or non-clustered. A primary key is a special key used to uniquely identify records in a table, whereas a foreign key is used to establish relationship between two tables. Both are identical in structure but play different roles in relational database schema. A primary key is a special key used to uniquely identify records in a table, whereas a foreign key is used to establish relationship between two tables. Both are identical in structure but play different roles in relational database schema.

Table B
Columns :- M (Primary Key), N (Foreign Key to Table A's X column)

Primary Key

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