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Question
is it possible to assign two primary key in a table
 Question Submitted By :: MySQL
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
A table can have only one primary key assigned. 
Is This Answer Correct ?    14 Yes 0 No
Sushma S
 
Answer
# 2
IF WE MAKE COMPOSITE PRIMIRAY KEY THEN ONLY MORE THAN ONE
COLUMNS WILL BE BIND UP.
 
Is This Answer Correct ?    11 Yes 1 No
Sudipta Santra
 
 
 
Answer
# 3
At the end of the day a primary key is unique non null value
that the data is indexed upon.

Even if only one column can be explicitly defined as the PK.
It is possible to uniquely identify a row differently, by
creating a unique non null column that is indexed. It is
implicitly then a PK.
 
Is This Answer Correct ?    3 Yes 0 No
Jd
 
Answer
# 4
Answer is strictly NO...!!!

we may have morethan one unique column in a table but we should assign only one primary key...!!
 
Is This Answer Correct ?    3 Yes 0 No
Vignesh Lakshmirajan
 
Answer
# 5
no it doesn't possible 
Is This Answer Correct ?    3 Yes 0 No
Guest
 
Answer
# 6
any if one time primary key in a table 
Is This Answer Correct ?    0 Yes 0 No
Rajan
 
Answer
# 7
yes 
Is This Answer Correct ?    1 Yes 2 No
Rajan Bajalia
 

 
 
 
Other MySQL Interview Questions
 
  Question Asked @ Answers
 
mysql> select * from store; +------+-------+-------+ | id | month | sales | +------+-------+-------+ | 1 | 1 | 100 | | 1 | 2 | 100 | | 1 | 3 | 200 | | 1 | 4 | 300 | | 1 | 5 | NULL | | 1 | 6 | 200 | | 1 | 7 | 800 | | 1 | 8 | 100 | | 1 | 9 | 240 | | 1 | 10 | 140 | | 1 | 11 | 400 | | 1 | 12 | 300 | | 2 | 1 | 300 | | 2 | 2 | 300 | | 2 | 3 | 300 | | 2 | 4 | 200 | | 2 | 5 | 200 | | 2 | 6 | 200 | | 2 | 7 | 100 | | 2 | 8 | 100 | | 2 | 9 | 300 | | 2 | 10 | 100 | | 2 | 11 | 150 | | 2 | 12 | 150 | +------+-------+-------+ this is my table. i need to display output like this. +------+----------+----------+----------+----------+ | id | quarter1 | quarter2 | quarter3 | quarter4 | +------+----------+----------+----------+----------+ | 1 | 400 | 500 | 1140 | 840 | | 2 | 900 | 600 | 500 | 400 | +------+----------+----------+----------+----------+ what single query i have to write for this. i tried this query and it displays like the below mysql> select id,sum(sales) as quarter1,(select sum(sales) from store where mont h>3 and month<7 ) as quarter2,(select sum(sales) from store where month>6 and mo nth<10)as quarter3 from store where month>0 and month<4 group by id; +------+----------+----------+----------+ | id | quarter1 | quarter2 | quarter3 | +------+----------+----------+----------+ | 1 | 400 | 1100 | 1640 | | 2 | 900 | 1100 | 1640 | +------+----------+----------+----------+ 2 rows in set (0.00 sec) tel me how to rectify it.   2
What is the use of indexing table?   2
Explain advantages of InnoDB over MyISAM?   1
Difference between MYSQL_ASSOC,MYSQL_NUM and MYSQL_BOTH ? TCS 2
What happens if a table has one column defined as TIMESTAMP?   1
Explain multi-version concurrency control in MySQL?   2
which version of mysql can't support stored procedure??   3
How can we repair a MySQL table? Infosys 2
how fastest access of data can be done from database ?   3
What is the maximum length of a table name, database name, and fieldname in MySQL? TISL 2
how we connect the data base in any programme   2
The structure of table view buyers is as follows: +----------------+-------------+------+-----+---------+----- -----------+ | Field | Type | Null | Key | Default | Extra | +----------------+-------------+------+-----+---------+----- -----------+ | user_pri_id | int(15) | | PRI | NULL | auto_increment | | userid | varchar(10) | YES | | NULL | | +----------------+-------------+------+-----+---------+----- -----------+ the value of user_pri_id the last row 2345 then What will happen in the following conditions? Condition1: Delete all the rows and insert another row then. What is the starting value for this auto incremented field user_pri_id , Condition2: Delete the last row(having the field value 2345) and insert another row then. What is the value for this auto incremented field user_pri_id   2
 
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