Add rownum from specific number - Oracle SQL

Question

I have a table:

table1

col1 col2
1    a
1    b
1    c

I want to add rownum but from a specific number, for ex. starting from 100, so it would look like:

col1 col2 rn
1    a    100
1    b    101
1    c    102

I know how to add rownum like below:

select a.*, rownum as rn from table1 a;

But I don't know how to add from a specific number. How to do it in Oracle SQL?

Answer 1

我认为没有必要从系统来源获取这种rownum，例如，您可以使用以下查询

select a.*, 99+rownum as rn from table1 a;

Answer 2

The ANSI SQL way of doing this would be to use ROW_NUMBER :

SELECT col1, col2, 99 + ROW_NUMBER() OVER (ORDER BY col2) rn
FROM table1;

You might be able to use Oracle's ROWNUM function here, but in that case you would also need to provide an ORDER BY clause to your query:

SELECT col1, col2, 99 + ROWNUM AS rn
FROM table1
ORDER BY col2;