multiple insert statements using sequence.

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Oracle

I have to insert multiple rows in a table using sequence
but there is primary key violation.plz help

Posted 24-Aug-12 22:51pm

baadsahcool

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Wendelius · Answer 1 · 2012-08-24T22:54:00

Solution 1

Most likely you re-use the same value from the sequence.

If you're inserting data based on a select query, then use the sequence inside the select. So something like:

SQL

INSERT INTO MyTable (
   PrimaryKeyCol,
   SomeCol1,
   SomeCol2,
   ...)
SELECT
   MySequence.NextVal,
   SomeColumn,
   AnotherColumn,
   ...
FROM MyTable
WHERE ....

Addition:

If the sequence is ordered:
- run

SQL

select max(keycolumn) from yourtable;

- run

SQL

select sequence.nextval from dual;

now if the highest value in your table is for example 10 and the sequence.nextval returned 7, then execute

SQL

select sequence.nextval from dual;

3 times

Posted 24-Aug-12 22:54pm

Wendelius

Updated 25-Aug-12 0:35am

v2

Comments

baadsahcool 25-Aug-12 5:04am

i am using
insert into tablename(primarykey,col 1,col 2)
values
(sequence.nextval,'value 1','value 2')

please help in this context.

Wendelius 25-Aug-12 5:08am

Okay, the sequence should take care of the uniqueness of the values. So the likeliest cause is that someone has added rows to that table without using the sequence or the sequence is altered or recreated.

Get the next value from the sequence by

select sequence.nextval from dual;

and compare it to the values in the table. If the sequence is ordered then you can for example run the nextval until you get the next non-existent value

baadsahcool 25-Aug-12 6:24am

please elaborate your answer

Wendelius 25-Aug-12 6:35am

See the updated answer

baadsahcool 25-Aug-12 8:02am

can u please give me example

Wendelius 25-Aug-12 9:21am

Example of what? I modified the answer to give you the exact commands to find out values from both the table and the sequence. Could you explain more what is the problem you're facing?

Espen Harlinn 25-Aug-12 8:43am

5'ed!

Wendelius 25-Aug-12 9:19am

Thanks :)