How to map from one table to another dependable on data from lookup?

I'm new in warehouse builder and i wonder how to do something what is very easily done by sql..
I want to map data from table_a to table_b, but not all rows - only those for which one of attributes in table_a have reference in table_c (is not null)...
I suppose it should go somehow with lookup operator, but playing with it, I wasn't able to achieve goal..
Thanks in advance for any help..

Hi Zeljko,
On of the easier ways (in my experience) of accomplishing this is to define a view which does a SELECT DISTINCT on table A and uses an EXISTS clause to exactly filter those records that you want to get into your target table (i.e. the ones that already have an occurrence in table C).
And if performance is an issue, you could experiment with FIRST_ROWS hint or rownum=1 in the EXISTS clause.
Cheers, Patrick

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      CASE
        WHEN crec.period_num=5 THEN sales_mtl_ovhd_cost_month5
        ELSE 0
      END item_mtl_ovhd_cogs_period5,
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        WHEN crec.period_num=5 THEN sales_res_cost_month5
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      CASE
        WHEN crec.period_num=5 THEN sales_op_cost_month5
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      CASE
        WHEN crec.period_num=5 THEN sales_ovhd_month5
        ELSE 0
      END item_ovhd_cogs_period5,
      CASE
        WHEN crec.period_num=5 THEN sales_units_month5
        ELSE 0
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      CASE
        WHEN crec.period_num=6 THEN sales_amount_month6
        ELSE 0
      END Transaction_quantity_period6,
      CASE
        WHEN crec.period_num=6 THEN sales_mtl_cost_month6
        ELSE 0
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      CASE
        WHEN crec.period_num=6 THEN sales_mtl_ovhd_cost_month6
        ELSE 0
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      CASE
        WHEN crec.period_num=6 THEN sales_res_cost_month6
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      CASE
        WHEN crec.period_num=6 THEN sales_op_cost_month6
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      CASE
        WHEN crec.period_num=6 THEN sales_ovhd_month6
        ELSE 0
      END item_ovhd_cogs_period6,
       CASE
        WHEN crec.period_num=6 THEN sales_units_month6
        ELSE 0
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      CASE
        WHEN crec.period_num=7 THEN sales_amount_month7
        ELSE 0
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      CASE
        WHEN crec.period_num=7 THEN sales_mtl_cost_month7
        ELSE 0
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      CASE
        WHEN crec.period_num=7 THEN sales_mtl_ovhd_cost_month7
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      CASE
        WHEN crec.period_num=7 THEN sales_res_cost_month7
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      CASE
        WHEN crec.period_num=7 THEN sales_op_cost_month7
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      CASE
        WHEN crec.period_num=7 THEN sales_ovhd_month7
        ELSE 0
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      CASE
        WHEN crec.period_num=7 THEN sales_units_month7
        ELSE 0
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      CASE
        WHEN crec.period_num=8 THEN sales_amount_month8
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      CASE
        WHEN crec.period_num=8 THEN sales_mtl_cost_month8
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      CASE
        WHEN crec.period_num=8 THEN sales_mtl_ovhd_cost_month8
        ELSE 0
      END item_mtl_ovhd_cogs_period8,
      CASE
        WHEN crec.period_num=8 THEN sales_res_cost_month8
        ELSE 0
      END item_resource_cogs_period7,
      CASE
        WHEN crec.period_num=8 THEN sales_op_cost_month8
        ELSE 0
      END item_op_cogs_period8,
      CASE
        WHEN crec.period_num=8 THEN sales_ovhd_month8
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      CASE
        WHEN crec.period_num=8 THEN sales_units_month8
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      CASE
        WHEN crec.period_num=9 THEN sales_amount_month9
        ELSE 0
      END Transaction_quantity_period9,
      CASE
        WHEN crec.period_num=9 THEN sales_mtl_cost_month9
        ELSE 0
      END item_material_cogs_period9,
      CASE
        WHEN crec.period_num=9 THEN sales_mtl_ovhd_cost_month9
        ELSE 0
      END item_mtl_ovhd_cogs_period9,
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        WHEN crec.period_num=9 THEN sales_res_cost_month9
        ELSE 0
      END item_resource_cogs_period7,
      CASE
        WHEN crec.period_num=9 THEN sales_op_cost_month9
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      CASE
        WHEN crec.period_num=9 THEN sales_ovhd_month9
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       CASE
        WHEN crec.period_num=9 THEN sales_units_month9
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      CASE
        WHEN crec.period_num=10 THEN sales_mtl_cost_month10
        ELSE 0
      END item_material_cogs_period10,
      CASE
        WHEN crec.period_num=10 THEN sales_mtl_ovhd_cost_month10
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        WHEN crec.period_num=10 THEN sales_res_cost_month10
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      CASE
        WHEN crec.period_num=10 THEN sales_op_cost_month10
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      CASE
        WHEN crec.period_num=10 THEN sales_ovhd_month10
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      CASE
        WHEN crec.period_num=10 THEN sales_units_month10
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      CASE
        WHEN crec.period_num=11 THEN sales_mtl_cost_month11
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      CASE
        WHEN crec.period_num=11 THEN sales_mtl_ovhd_cost_month11
        ELSE 0
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      CASE
        WHEN crec.period_num=11 THEN sales_res_cost_month11
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      END item_resource_cogs_period11,
      CASE
        WHEN crec.period_num=11 THEN sales_op_cost_month11
        ELSE 0
      END item_op_cogs_period11,
      CASE
        WHEN crec.period_num=11 THEN sales_ovhd_month11
        ELSE 0
      END item_ovhd_cogs_period11,
      CASE
        WHEN crec.period_num=11 THEN sales_units_month11
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      CASE
        WHEN crec.period_num=12 THEN sales_mtl_ovhd_cost_month12
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      END item_mtl_ovhd_cogs_period12,
      CASE
        WHEN crec.period_num=12 THEN sales_res_cost_month12
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      CASE
        WHEN crec.period_num=12 THEN sales_op_cost_month12
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      CASE
        WHEN crec.period_num=12 THEN sales_ovhd_month12
        ELSE 0
      END item_ovhd_cogs_period12,
        CASE
        WHEN crec.period_num=12 THEN sales_units_month12
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        WHEN crec.period_num=3 THEN sales_cost_month3
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       CASE
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      END item_cogs_period8,
      CASE
        WHEN crec.period_num=9 THEN sales_cost_month9
        ELSE 0
      END item_cogs_period9,
       CASE
        WHEN crec.period_num=10 THEN sales_cost_month10
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       CASE
        WHEN crec.period_num=11 THEN sales_cost_month11
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      CASE
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      a.attribute7 ,
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      a.attribute10,
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                 WHEN crec.period_num=4  THEN sum(sales_amount_month4)
                 WHEN crec.period_num=5  THEN sum(sales_amount_month5)
                 WHEN crec.period_num=6  THEN sum(sales_amount_month6)
                 WHEN crec.period_num=7  THEN sum(sales_amount_month7)
                 WHEN crec.period_num=8  THEN sum(sales_amount_month8)
                 WHEN crec.period_num=9  THEN sum(sales_amount_month9)
                 WHEN crec.period_num=10 THEN sum(sales_amount_month10)
                 WHEN crec.period_num=11 THEN sum(sales_amount_month11)
                 WHEN crec.period_num=12 THEN sum(sales_amount_month12)
                END !=0;
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    END LOOP;
    END;
    Thank You

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