Sum of ? Where ? = ?

[Guest]

Hi
I am trying to create a query where it will add all the hours worked on a
specific job. My logsheets have entries where, for each logsheet, there will
be multiple entries with hours worked on each, with a 'duty' for each entry
such as ' In Port' or 'On Board' or 'Sailing'. I need to be able to run a
query where i can enter a parameter of eg, 'Sailing' and then it will show me
all the hours worked on that specific duty.
My query has a field with a calculation in it already which works out the
hours for that entry according to what was entered time-wise. this is it and
it works fine:

=Round(IIf((DateDiff("n",[Time on Duty],[Time off
Duty])/60)<0,(DateDiff("n",[Time on Duty],[Time off
Duty])/60)+24,(DateDiff("n",[Time on Duty],[Time off Duty])/60)),2)

I then need my calculation to be based on the answers in this column to be
added according to 'Sailing' or 'Launch', etc.

Please help. Thank you.
Rigby

 

[[MVP] S.Clark]

Assuming this field is called Category, you could do something like the
following:

SELECT PersonID, Category, Sum(Hours) from tablename GROUP BY PersonID,
Category

This results in 3 columns, and 1 row per category for each emp.

1, Sailing, 25
1, On Dock, 15
1, Overboard, 10
etc.