foreign keys in oracle

Question

0.00/5 (No votes)

See more:

In MSSQL and MySQL when declaring foreign keys we used this format

CONSTRAINT fk_emp FOREIGN KEY (P_Id)
REFERENCES Persons(P_Id)

but in oracle don't specify the column name of the table that we need to add a reference to.

it was done like this

CONSTRAINT fk_emp FOREIGN KEY (P_Id)
REFERENCES Persons

in this case how does the db know which column needs to be referenced with the column in persons table?

Posted 19-Jul-13 1:50am

Muthu Karunarathna

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

scottgp · Accepted Answer · 2013-07-19T02:26:00

Solution 1

According to the documentation - http://docs.oracle.com/cd/B28359_01/server.111/b28286/clauses002.htm[^], " Because the referenced key is the primary key of the parent table, the referenced key column names are optional.".
Scott

Posted 19-Jul-13 2:26am

scottgp