Question

I have two tables (inputs and categories):

CREATE TABLE categories (
    iId INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    sName TEXT NOT NULL,
    iParent INTEGER,
    FOREIGN KEY (iParent) REFERENCES categories(iId)
);

CREATE TABLE inputs (
    iId INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    iCategory INTEGER,
    dValue DOUBLE NOT NULL,
    FOREIGN KEY (iCategory) REFERENCES categories(iId)
);

I need get the sums(dValue column) from inputs table for each category. Even if the sum result is zero.

If is it possible would be better if I could get the sum for each Parent Category ( when categories.iId = categories.iParent, summing the results of the child categories to the parent category )

Can anyone help me? I appreciate any help!
Thanks!

Answer 1

Try this:

select c.iParent, sum(i.dValue)
from categories c
left outer join inputs i on i.iCategory=c.iId
group by c.iParent

EDIT : With accounts:

select c.iParent, a.iCurrency, sum(i.dValue)
from categories c
left outer join inputs i on i.iCategory=c.iId
left outer join accounts a on i.iAccount=a.iId
group by c.iParent,a.iCurrency