how to joining two group-by queries - ms-access

Question

alright this is my mistakes, I asked question that nobody would understand it, now I'm trying to make my question clearer and more simple.
Here I've 3 tables, first is employeeid contains (nameid, salary), second is overtimeid contains (nameid 'from employeeid', period, tot_ot), and the third is absenceid contains (nameid 'from employeeid', period, tot_absence).
how can I populate those three tables into one query containing (nameid, salary, period (fr overtimeid should be the same with absenceid), tot_ot, tot_absence).
please help me master of ms-access, I can't do wonder thing without your help,..... thanks before.

Answer 1

You can use query like this:
SELECT nameid, period, Sum(tot_absence) AS SumOftot_absence, Sum(tot_ot) AS SumOftot_ot
FROM
(SELECT nameid, period, tot_absence, Null AS tot_ot
FROM absenceid
UNION ALL
SELECT nameid, period, Null AS tot_absence, tot_ot
FROM overtimeid)
GROUP BY nameid, period;
Then outer join it with employeeid and you will receive the list of employees for each period
Edit
Query for tables from comments:
SELECT NMKARY, PERIODGJ, sum(JMLMBUR) as sumofJMLMBUR, sum(TOTABS) as sumofTOTABS, sum(KASBON) as sumofKASBON
FROM (
SELECT NMKARY, PERIODGJ, JMLMBUR, Null as TOTABS, Null as KASBON
FROM overtimeid
Union ALL
SELECT NMKARY, PERIODGJ, Null as JMLMBUR, TOTABS, KASBON
FROM potonganid
)
GROUP BY NMKARY, PERIODGJ;