Full outer join is resulting in Cartesian product when counting records in Cognos -

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am doing full outer join on 2 tables , b on column "id" in cognos report studio. both tables have multiple records id column. requirement have count number of records each table , show on graph. when count records, multiplying records , resulting in cartesian product. 

a.id ----   b.id   1 ------ 1   2 ------ 2   2 ------ 2   3 ------ 4   4 ------ 5   5 ------ 6

when count get: 

a.id ----   b.id ----  count(a.id)----   count(b.id)   1  ----     1   ----     1    ----       1   2 ----      2  ----      4  ----         4    (am expecting 2 these kind of records)   3  ----      null ---- 1 ---- null   4 ----      4 ----       1----           1           5 ----      5  ----      1 ----          1    null ----        6 ----  null  ----               1

i need present total number of records table , table b in graph. since resulting in cross product, graph values not giving correct results.can 1 suggest how avoid cartesian product 2nd record? please suggest if possible or not?

if have display count separately use union of 2 tables , count id separately.


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