how to count data separately

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hi there,

I have a problem to select data. The data are: _

ID     Date          Status
1      2008-01-01    A
1      2008-01-05    A
1      2008-01-11    A
1      2008-01-28    A
1      2008-02-02    A
1      2008-02-15    B
1      2008-02-26    A
1      2008-03-04    A
1      2008-03-17    B
1      2008-03-29    A
2      2008-01-01    A
2      2008-02-24    A
2      2008-03-26    B

The data should be shown in following _

ID    Status    Count      
1     A         1          
1     B         1
1     A         1          
1     B         1
1     A         1
2     A         1
2     B         1

The status A should be count as 1 until the status is B. The flow is many A, once B.

I need a hand.
Thanks all.

Posted 28-Sep-11 22:43pm

z4rk

Updated 29-Sep-11 18:42pm

v4

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Mehdi Gholam 29-Sep-11 4:47am

How do you want the grouping to be it is not apparent from your description, be more specific?

OriginalGriff 29-Sep-11 4:48am

The problem is that it is not obvious what criteria to use to work out what data you are trying to select - Why is the count 1 for 01-01 to 02-02 when you have five entries in the data, for example.

Work out what you need, and then use the "Improve question" widget to edit your question and provide better information.

Corporal Agarn 29-Sep-11 12:18pm

What have you tried?

1 solution

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Jörgen Andersson · Answer 1 · 2011-09-29T08:38:00

There's a lot of interpretation in this solution, but try this query and tell me what's missing or wrong.

Assumption 1: The ID column can actually be different and all id's should be treaded separately, if not, omit the o1.ID = o2.ID
Assumption 2: The count column is there just for telling us that there should be only one entry in the result set for the first date until the status changes
And the same goes for the --description column

SQL

WITH ordered AS(
    SELECT  ID,Date,Status,ROW_NUMBER() OVER(ORDER BY Date) as rn
    FROM    MyTable
    )
SELECT  o1.ID,o1.DATE
FROM    ordered o1,ordered o2
WHERE   o1.ID = o2.ID
    AND o1.rn = o2.rn -1
    AND o1.Status <> o2.Status