Hi Experts
Please help me to find the reason for returning less records while doing LEFT Outer join .
This is happening with a particular column only.
TOTAL COUNT
| select count(*) from "SRC"."TABLE" O | |
| where o.effective_end_dt is null ; | |
--136,963 |
TOTAL COUNT WITH LEFT OUTER ON REQUIRED COLUMN ( WRONG COUNT )
select count(*) from "SRC"."TABLE" O left outer join "SRC"."TABLE_1" A on O.Dept_Id=A.Row_Id
| where o.effective_end_dt is null AND A.EFFECTIVE_END_DT IS NULL ; | |
--135,164 |
TOTAL COUNT WITH LEFT OUTER ON DIFFERENT COLUMN ( CORRECT COUNT )
select count(*) from "SRC"."TABLE" O left outer join "SRC"."TABLE_1" A on O.row_id=A.Row_Id
| where o.effective_end_dt is null AND A.EFFECTIVE_END_DT IS NULL ; | |
| --136,963 |
Please suggest .
Thanks
Anupam .