The use of sequence and generate the number in a table that has data

Hello

There is a custom table that has a column Rowid (NULL).
This table already has 10 k with rowid as null lines, now the user asks me to enter a unique number for the Rowid.
I created a sequence, but don't know how to use this sequence and generate numbers for the Rowid.

Could you suggest.

Thank you.

"rowid" is an oracle reserved word and should be avoided. Perhaps "Rowid" between quotes or something.

Here's how to "fill" a column by a sequence:

SQL> create table t (id number, value varchar2(100));

Table created.

SQL> insert into t (value) select object_name from all_objects where rownum <= 10000;

10000 rows created.

SQL> create sequence idgen_sequence;

Sequence created.

SQL> update t set id = idgen_sequence.nextval;

10000 rows updated.

Given that the sequence was used all the 'id's will be unique.

Tags: Database

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