sql - Correlated subqueries: How to get the ID of the outer query? -


i have multiple tables : 

person --------------------- idperson, name  stickertransaction --------------------- idtransac, idperson, idsomeoneelse, nbstickersreceived, nbstickersgiven  purchase --------------------- idpurchase, idperson, nbstickersbought

i'm trying every person never made transaction or have 0 sticker. have number of stickers person has, here's formula :

nbstickersbought + nbstickersreceived - nbstickersgiven

here's query i've got far. problem i've got in subsubsubqueries... not have access person's id.

is there way have access person's id or there better way write query ?

select people.idperson, people.name (     -- selects people never made sticker transaction      select p.idperson, p.name     person p     left join stickertransaction st     on p.idperson = st.idperson     st.idperson null      union      -- selects people have 0 sticker      select p.idperson, p.name     person p     0 = (                 select sum(nbstickers) nbstickers                 (                         -- not have access p.idperson here...                         select (st.nbstickersreceived - st.nbstickersgiven) nbstickers                        stickertransaction st                        st.idperson = p.idperson                       union                         -- not have access p.idperson here either...                         select pu.nbstickersbought nbstickers                        purchase pu                        pu.idperson = p.idperson                      )               ) ) people

afaik can't correlation derived table. can rewrite query non-correlated subquery:

select people.idperson, people.name (     -- selects people never made sticker transaction      select p.idperson, p.name     person p     left join stickertransaction st     on p.idperson = st.idperson     st.idperson null      union      -- selects people have 0 sticker      select p.idperson, p.name     person p     join     (                 select st.idperson, sum(nbstickers) nbstickers                 (                         select (st.nbstickersreceived - st.nbstickersgiven) nbstickers                        stickertransaction st                       union                         select pu.nbstickersbought nbstickers                        purchase pu                      ) dt                 group st.idperson                 having sum(nbstickers) = 0              ) st     on st.idperson = p.idperson  ) people

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