Oracle Join - Which is faster - using the whole table or a subquery that has specific columns needed in the table? - sql

Question

I am really new into optimizing queries. Could you please advise which INNER JOIN runs faster?
Please note that i am using two different ways of inner join syntax(have same # of records)
1.) INNER JOIN of subqueries that have DISTINCT and selected columns only from its respective table
select
fac.fac_id ,
dept.dept_id ,
wk.week_id ,
sum(case when TRIM(fpl.MEASURE) like '%Salar%Wage%' then DATAVALUE else 0 end) WAGES_AMT,
sum(case when TRIM(fpl.MEASURE) like '%Tot%Man%hour%Ret%' then DATAVALUE else 0 end) MANHRS_QTY,
fpl.md_cycle_nbr ,
fpl.md_load_dt
from
EAS_STG.FPA_PLAN_LABOR fpl
INNER JOIN
(
select distinct(dept_nbr), dept_id
from department_D
where regexp_instr( Dept_nbr,'([^0-9])') = 0
) dept
ON TO_NUMBER(TRIM( 'D' FROM fpl.department)) = TO_NUMBER(dept.dept_nbr)
INNER JOIN
(
select distinct(FAC.FAC_NBR), fai.fac_id
from FACILITY_D fac, FACILITY_ALTERNATE_ID fai
where fac.fac_id = fai.fac_id
and fac.company_id = 1101
) fac
ON TRIM(REPLACE(fpl.facility, 'Fac-')) = fac.fac_nbr
INNER JOIN
(
select distinct(wk_hierarchy_id) week_id from DAY_HIERARCHY_D
) wk ON TO_NUMBER(TRIM(REPLACE(fpl.scenario, 'Plan ')) || TRIM(REPLACE(fpl.time, 'Wk '))) = WK.week_id
GROUP BY
fac.fac_id ,
dept.dept_id ,
wk.week_id ,
fpl.md_cycle_nbr ,
fpl.md_load_dt
;
2.) INNER JOIN of the whole table without the selected columns
SELECT fac.fac_id
, dept.dept_id
, d.wk_hierarchy_id week_id
, SUM(CASE WHEN TRIM(fpl.MEASURE) LIKE '%Salar%Wage%' THEN datavalue ELSE 0 END) WAGES_AMT
, SUM(CASE WHEN TRIM(fpl.MEASURE) LIKE '%Tot%Man%hour%Ret%' THEN datavalue ELSE 0 END) MANHRS_QTY
, fpl.md_cycle_nbr
, fpl.md_load_dt
FROM EAS_STG.FPA_PLAN_LABOR fpl
JOIN department_d dept
ON TO_NUMBER(TRIM( 'D' FROM fpl.department)) = TO_NUMBER(dept.dept_nbr)
JOIN facility_d fac
ON TRIM(REPLACE(fpl.facility, 'Fac-')) = fac.fac_nbr
JOIN facility_alternate_id fai
ON fac.fac_id = fai.fac_id
JOIN day_hierarchy_d d
ON TO_NUMBER(TRIM(REPLACE(fpl.scenario, 'Plan ')) || TRIM(REPLACE(fpl.time, 'Wk '))) = d.wk_hierarchy_id
WHERE fac.company_id = 1101
AND REGEXP_INSTR(dept_nbr,'([^0-9])') = 0
GROUP BY fac.fac_id
, dept.dept_id
, d.wk_hierarchy_id
, fpl.md_cycle_nbr
, fpl.md_load_dt
;