update data type of a column in oracle

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i am using this query for updation : It shows the error Invalid alter table option:

1 : ALTER TABLE MENU."MNU_TASK" MODIFY TASK_ID NUMBER NOT NULL AUTO_INCREMENT

2 : ALTER TABLE MENU.MNU_TASK MODIFY TASK_ID NUMBER NOT NULL AUTO_INCREMENT

both not working

thanks in advance.

Posted 28-Apr-11 3:39am

Manoj Prajapat

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Manfred Rudolf Bihy 28-Apr-11 10:04am

"Not working" is not very informative. Please give us the complete error message.

3 solutions

Solution 2

I found a workaround for Oracle as it does not seem to support it per keyword: http://jen.fluxcapacitor.net/geek/autoincr.html[^].
Or try here it seems to be analogous: http://www.lifeaftercoffee.com/2006/02/17/how-to-create-auto-increment-columns-in-oracle/[^].

Best Regards,

-MRB

Posted 28-Apr-11 4:05am

Manfred Rudolf Bihy

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ZeeroC00l 28-Apr-11 11:30am

I removed the answer...

Solution 1

It should be in the following format:

alter table 
   table_name
modify 
( 
   column_name    data_type
);

In your case, you forgot the round brackets.

Posted 28-Apr-11 4:03am

Ryan Zahra

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Pratik Bhesaniya · Accepted Answer · 2011-04-28T06:31:00

Yes it might be the case if you have already declare TASK_ID Column as NULL and you have some values in your table which contains TASK_ID as NULL and now you are trying to add "Not Null" Constrained on values those are already NULL.

So please be sure if you have any such issue then in this case you can do following things,

1. You have manually update your existing Table Where You have Write Some Values where TASK_ID is NULL.So that now TASK_ID Column contains Some value and You can Alter Your Table.

2.You have to Again create your Table in which now you have to specify your constrained i.e TASK_ID Column as Not Null...

3.Drope Your existing Table and Make a New one.