how we can use more then one primary key in Single Table
Answers were Sorted based on User's Feedback
Answer / mukesh
Its impossible to create two primary key in a single table
but if we use composite key we have do it just like that
CREATE TABLE Test (id1 INT NOT NULL, id2 INT NOT NULL, name
CHAR(20) NOT NULL, PRIMARY KEY(id1,id2));
Is This Answer Correct ? | 14 Yes | 0 No |
Answer / sathishrpillai
A single table can't have two primary keys.it can only
forgein keys.but u can use any number of foregin key in a
single table.
Is This Answer Correct ? | 15 Yes | 7 No |
Answer / piyush
We can use more then one primary keys in a single table but
it is possible only in 2005. otherwise we can not use more
then one primary keys in a single table.
Is This Answer Correct ? | 10 Yes | 3 No |
Answer / frank
Can't, but can create primary key with multiple columns:
CREATE TABLE Test (id1 INT NOT NULL, id2 INT NOT NULL, name
CHAR(20) NOT NULL, PRIMARY KEY(id1,id2));
Is This Answer Correct ? | 8 Yes | 1 No |
Answer / sharad
CREATE TABLE Test (id1 INT ,id2 INT , name CHAR(20) NOT
NULL, PRIMARY KEY(id1,id2));
Is This Answer Correct ? | 4 Yes | 0 No |
Answer / naveen
with this query two primary keys are created but in the insertion time it doesn'y work automatically.it says it can't insert null value in id1.
CREATE TABLE Test (id1 INT NOT NULL, id2 INT NOT NULL, name
CHAR(20) NOT NULL, PRIMARY KEY(id1,id2));
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / sonu kumar
we can more than one primary key in a single table in case of self joining
eg:-if want to details of employee and their manager in same table than empid,mngid both treated as primary key
Is This Answer Correct ? | 0 Yes | 0 No |
What is select query in mysql?
Why is the basic difference between left join, right join and inner join?
How many tables we can create in mysql database?
Should I use pdo or mysqli?
What is the data type for file in mysql?
What is join in mysql? What are the different types of join?
In mysql, what is the default storage engine?
How do I copy a table in mysql?
Which statement is used to delete a table in MySQL.
if we want to load data from a text file into a mysql table, but the columns in table are 1st: code(int) and 2nd: city(varchar), but in text file the format is 1st cityname and then code separeted by delimeters. how to load?
What is meant by mysql database?
I want to insert userid of a customer,order time,etc in a table called ordermaster with orderid as primary key.Same time the product codes and required quantities (a1,2 and a2 4 and so on)inserted in another table orderdetails with same orderid reference.How the code will be in JSP using MySQL?