How to ignore duplicate rows

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SQL-Server-2008R2

SQL

  Id    Status                                  Number
1242    P                                   5.25
   3    P                                   7.5
  11    P                                   9
  19    P                                   9
  36    P                                   9
   3    F                                   0
   4    F                                   0
   9    F                                   3.75
  19    F                                   3.75

Sum of number having status 'P' and those 'F' have id which is not in status 'P'.

I mean sum of 1242(P),3(P),11(P),19(P),36(P),4(F),9(F) ... Ignore these 2 rows 3(F) and 19(F).

Thank You!

Posted 7-Jul-15 2:08am

Afzal Shaikh

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Kornfeld Eliyahu Peter 7-Jul-15 8:19am

Ignored them...
But what have YOU tried?[^]

1 solution

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Andy Lanng · Accepted Answer · 2015-07-07T02:26:00

There is a trick to this.

The issue is that any groupings you apply will not effect the sum. You need a Common Table Expressions(CTE)[^].

Read up on it because they are so powerful

So, your query might look like this:

SQL

WITH myCTE1 as (
  SELECT Id, Status, Number
  From table
  where Status = 'P'),
myCTE2 as (
  Select t.Id, t.Status, t.Number
  From table t
  where t.Status = 'F'
  AND NOT EXISTS (SELECT * FROM myCTE1 WHERE Id = t.Id)
  UNION SELECT Id, Status, Number
  FROM myCTE1)

SELECT sum(Number), Status FROM myCTE2 GROUP BY Status