Interested to Buy Any Domain ? << Click Here >> for more details...
Can a primary key have null values? If we try to insert a
null value in a primary key column, will it work or give an
error code?
- 6 Answers
- 22451 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / sangeetha
There cannot be null values in a Primary Key column.
It will result in error code.
| Is This Answer Correct ? | 26 Yes | 3 No |
In DB2 you can not create a primary key on a column which
is not 'not null'.
If you are trying to create a primary key on a column which
is not 'not null' then dbb2 will return an error like this
SQL0542N "feild_name" cannot be a column of a primary key
or unique key because it can contain null values.
SQLSTATE=42831
But once u alter the table and set the column to 'NOT NULL'
then you can make it as primary key.
Now if u r trying to insert an null value to ur primary key
column then db2 will trows an error like
SQL0407N Assignment of a NULL value to a NOT NULL
column "TBSPACEID=5, TABLEID=404, COLNO=0" is not allowed.
SQLSTATE=23502.
In short you can not make a column which can hold 'NULL'
value as your primary key and you can not insert a 'NULL'
value into your primary key feild.
Cheers,
Ratheesh Nellikal
| Is This Answer Correct ? | 7 Yes | 1 No |
Answer / satya prasad n
The PRIMARY KEY cannot be null. you can insert ZERO into
that but should not be null. It will throw an error if you
try to inserts a NULL.
| Is This Answer Correct ? | 8 Yes | 4 No |
Answer / guest
A primary key can have a NULL value. The error will be
shown only when NOT NULL is defined in the table creation.
| Is This Answer Correct ? | 10 Yes | 10 No |
Answer / sachin borase
May be it will throws the -803 error (803 means index
violation )
| Is This Answer Correct ? | 1 Yes | 4 No |
Answer / priya
Can you please clarify what kind of error code/sqlcode will
be returned if we try to insert a null value in a primary
key using a DB2 insert query?
| Is This Answer Correct ? | 2 Yes | 7 No |
What is dclgen in db2?
database DSNDB01 means a.db2 catalog b.db2 directory c.BSDS d.active logs answer with reason please
How to execute stored procedures?
What are leaf pages?
insert into tablename a column1, column2 select column1, column2 from tablename b i am getting abend -104..can any one help?
how can we find nth max salary from A table
What does db2 plan contain?
1. what if null values retrived from database and no null indicator mentioned in query. What is sql code.
db2 restart logic ?
what is a plan and how do you refer the plan in the program?
What do you mean by cursor?
While creating a table, by mistake you have given size of one field as 10. But as per requirement size should be 8. What is your next step?
COBOL 
