How to convert a single column in the primary key column

Hi all

I have a column that's unique cnstraint, this column contains the value as digital and also null.

So how do you convert to primary key column

Concerning
Prashant

Prashant wrote:
Hi all

I have a column that's unique cnstraint, this column contains the value as digital and also null.

So how do you convert to primary key column

Concerning
Prashant

Prashant,

You must assign new values to null values. You can use a sequence to produce the figures in this column.

Select max (your_unique_column) from your_table; -find the maximum value of this column, so you can start the sequence of this number.

create sequence seq_for_your_table with XXXX - value max + 1 you have found

Update your_table set your_unique_column = seq_for_your_table.nextval () where your_unique_column is null

You can create a primary key on this column.

Best regards

Grosbois

-------------------------------------------------------
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Tags: Database

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