sql - Sum a column that corresponds a aggregate from a column of another table -

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sorry title, couldn't think of better subject issue.

i've 2 tables in many-to-one relationship between them , other many-to-one relatioshop in same table. need sum column corresponds aggregate column of first table.

here image illustrate want:

example have no idea how proceed this.

this should do:

select  isnull(e.idparent,e.id) id,         sum(i.value) [sum] expense_table e left join invoice_table     on i.idexpense = e.id group isnull(e.idparent,e.id)

for updated requirement:

select  isnull(e.idparent,e.id) id,         e2.[description],         sum(i.value) [sum] expense_table e left join invoice_table     on i.idexpense = e.id inner join expense_table e2     on isnull(e.idparent,e.id) = e2.id group isnull(e.idparent,e.id),          e2.[description]

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