[英]Left Outer Join Subquery
我正在嘗試對子查詢執行左外連接,這可能嗎?
我可以這樣做嗎?:
##this is this weeks targets
select * from targets t
inner join streams s on s.id = t.stream_id
where t.week_no =WEEKOFYEAR(NOW())
left outer join
(
###############This is records selected so far this week
select p.brand_id, p.part_product_family, sum(r.best) from records r
inner join products p on p.id = r.product_id
left outer join streams s on s.body = p.brand_id and s.stream = p.part_product_family
where WEEKOFYEAR(r.date_selected) =WEEKOFYEAR(NOW())
group by p.brand_id, p.part_product_family;
) sq_2
on s.stream = sq_2.part_product_family
這是有效的:
##this is this weeks targets
select * from targets t
inner join streams s on s.id = t.stream_id
left outer join
(
###############This is records selected so far this week
select p.brand_id, p.part_product_family, sum(r.best) from records r
inner join products p on p.id = r.product_id
left outer join streams s on s.body = p.brand_id and s.stream = p.part_product_family
where WEEKOFYEAR(r.date_selected) =WEEKOFYEAR(NOW()) and YEAR(r.date_selected) = YEAR(now())
group by p.brand_id, p.part_product_family
) sq_2
on s.body = sq_2.brand_id and s.stream = sq_2.part_product_family
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