what is the difference between primary key & foreign key?
Answer Posted / reddy
foreign key is NULL
foreign key reference as Primary key in another table
Primary key is unique
primary key is not NULL and
Is This Answer Correct ? | 0 Yes | 1 No |
Post New Answer View All Answers
How do you increase the OS limitation for open files (LINUX and/or Solaris)?
What is a tns file?
What is an oracle tablespace?
How to delete a column in an existing table in oracle?
How to create a new table by selecting rows from another table?
What is a trigger and what are its types in oracle?
What is Undo Management Advisor in Oracle?
I am using an Oracle 8i Database my data contains Clob data. I am using toad version 7.6 i am able to get the data in toad but unable to extract the data in excel.when trying to extract the data into the excel the toad error says out of memory. Can any body please help me to extract the data through the same toad version. Thanks in advance
What is data type in oracle?
What are the uses of linked server and explain it in detail?
How to create a table index in oracle?
How to define default values for formal parameters?
How to rename a tablespace in oracle?
What privilege is needed for a user to create tables in oracle?
Does oracle database need java?