Quarter in discoverer

Question

Hello People ,
i did tabular layout and display Quarter values for a years ,
some time the year come with 2 quarters because the othe values there are not values
like
Year|Quarter|Mark
1992|Q1|4
1992|Q2|5
1992|Q3|3
1992|Q4|2
1993|Q1|10
1993|Q2|2
1993|Q4|1
take a look on 1993 there is not Q3
how to display Q3 with null value or 0

Answer 1

Hi
If you ran this query as a SQL query in the database you would also get no rows for quarters when there are no values. Discoverer cannot invent data that does not exist. You cannot invent values in a table where those values don't exist in the database.
What we need to do is come at this from a different direction. You need a folder of years and quarters that is outer joined to the transaction folder to get the mark, substituting NULL with a 0. This is standard practice in a reporting environment and basically what you are doing is creating a mini-star schema.
Try creating a new custom folder something like this:
SELECT DISTINCT
YEAR, QUARTER
FROM
DATE_TABLE
You should now have a folder that, if queried on its own, results in something like this:
Year | Quarter
2002 | 1
2002 | 2
2002 | 3
2002 | 4
2003 | 1
2003 | 2
2003 | 3
2003 | 4
and so on
If you don't have a date folder then you can create a custom folder like this:
SELECT 2002 YEAR, 1 QUARTER FROM DUAL
UNION
SELECT 2002 YEAR, 2 QUARTER FROM DUAL
UNION
SELECT 2002 YEAR, 3 QUARTER FROM DUAL
UNION
SELECT 2002 YEAR, 4 QUARTER FROM DUAL
UNION
SELECT 2003 YEAR, 1 QUARTER FROM DUAL
UNION
SELECT 2003 YEAR, 2 QUARTER FROM DUAL
UNION
SELECT 2003 YEAR, 3 QUARTER FROM DUAL
UNION
SELECT 2003 YEAR, 4 QUARTER FROM DUAL
This will give you a new folder containing a Year and a Quarter
Next you create an outer join from the year and quarter in here to where you are picking up the Mark. You will now get all years and quarters as well as the mark if it exists.
Hope this helps
Best wishes
Michael