Create two logical columns with same LTS mapping but diff filter conditions

Question

Hi,
Problem:
How to create two logical columns within same logical table mapped to same physical column but different filter conditions?
I have a scenario where in,
Physical layer columns
     - table1.employee
     - table1.emp_city
I need a columns in logical layer:
Logical layer - lt1.count_emp_delhi (counts distinct employees whose city_name = 'Delhi')
          lt1.count_emp_mumbai(counts distinct employees whose city_name = 'Mumbai')
My approach:
For Delhi column
1. Create a logical column lt1.count_emp_delhi mapped to the physical column table1.employee
2. Aggregate using countdistinct in aggregate tab.
3. Edit the mapping condition
     3.1. Use the where clause and set table1.emp_city='Delhi'.
For Mumbai column.
Followed the same approach as above but in 3.1 if I change the condition to 'Mumbai', even the delhi column is populated with mumbai count which is ERRONEOUS
Could some one please help?

Answer 1

Hi,
1. Create two alias tables for table1 in Physical Layer. Lets say TB_Mumbai and TB_Delhi
2. Create a logical table in BMM layer (D1 Employee Cities )
3. Drag and drop the employee & emp_city columns from both alias tables (TB_Mumbai and TB_Delhi ) into your newly created logical table.
4. Now you can see two Logical Table Sources (TB_Mumbai and TB_Delhi )
5. Now using Where condition, write the condition on each table
NOTE: Don't write any condition on the Physical table Table1.
Hope it helps you.
Regards,
Kalyan Chukkapalli
http://123obi.com