Question

Let’s say I have this table:

|Fld | Number|
 1     5
 2     2

And I want to make a select that retrieves as many Fld as the Number field has:

|Fld |
 1
 1
 1
 1
 1
 2
 2

How can I achieve this? I was thinking about making a temporary table and instert data based on the Number, but I was wondering if this could be done with a single Select statement.

PS: I’m new to SQL

Answer 1

Not an great solution (since you still query your table twice, but maybe you can work from it)

    SELECT t1.fld, t1.number
    FROM table t1, (
        SELECT ROWNUM number FROM dual 
        CONNECT BY LEVEL <= (SELECT MAX(number) FROM t1)) t2
    WHERE t2.number<=t1.number

It generates maximum amount of rows needed and then filters it by each row.