Generate a sequence based on a number

I have two tables... I want to generate the sequence 01, 02, etc., based on total_sections

Table 1:
CourseID Total_sections
1 101
1 102
3 103
2 104

I would like to create a table based on the table above and the result should look like:

CourseID Section_Num
101 01
102 01
103 01
103 02
103 03
104 01
104 02

How can I achieve this?

And two more :)

With 11g recursive subquery factoring:

WITH t (course, number_of_sections, section_num) AS (
 SELECT course, number_of_sections, 1
 FROM your_table
 UNION ALL
 SELECT course, number_of_sections, section_num+1
 FROM t
 WHERE section_num < number_of_sections
)
SELECT course,
       to_char(section_num, '09') as section_num
FROM t
;

With a bit of XML:

SELECT t.course,
       to_char(x.num,'09') as section_num
FROM your_table t,
     XMLTable( '1 to xs:integer($n)'
               passing t.number_of_sections as "n"
               columns num for ordinality ) x
;

Tags: Database

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