I have to load 3 tables like below. Can you suggest what is the best method to load these tables, do I have to load them independently and join (syncretized keys will come) or do I need to concatenate and load them as one single table?
TABLE A YEAR MONTH REGION PRODUCT DEPARTMENT SALES SALES_QUANTITY
TABLE B YEAR MONTH REGION PRODUCT DEPARTMENT ORDER ORDER_QUANTITY
TABLE C YEAR MONTH REGION PRODUCT DEPARTMENT CUSTOMOER ID CUSTOMER NAME PRESHIMPMENT VOLUME PRESHIMENT_QUANTITY
