sql - Access UNION and JOIN query -

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situation: access database i'm working on separates parts left , right parts. same part can used on both sides. trying create query count total number of individual parts needed per week.

question: how create query allows union multiple fields , join shown below?

table 1: part # |left part | left part qty | right part | right part quantity 1        xyz         5               lmn          7 2        abc         8               xyz          4  table 2: part # | needed 1        10 2        25  query: part | quantity xyz    150 (5 * 10) + (4 * 25)  abc    200 (8 * 25)  lmn    70 (7 * 10)

you have problem in ms access, because cannot put union/union all subquery. if have table of parts (which should have), can use left join, think following want:

select p.partname,        sum(nz(t1l.leftpartqty * t2.needed) + nz(t1r.rightpartqty * t2.needed)) ((part p inner join        table2 t2        on p.part# - t2.part#        ) left join       table1 t1l       on t1l.leftpart = p.partname       ) left join      table1 t1r      on t1r.rightpart = p.partname group p.partname;

if don't have such table, can use view union all , proceed there.


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