MySQL的嵌套的總和連接和組由

Question

我有如下表我的結果總是不正確

表1：PRODUCT_CATEGORY

| id | title  | 
    | 1 | Electronics | 
    | 2 | Kitchen  | 

表2：sold_items

| id | product_id | invoiceid | product_category_id | qty | 
| 1 | 91   | 1001  | 1     | 2 | 
| 2 | 92   | 1001  | 1     | 3 | 
| 3 | 93   | 1002  | 2     | 7 | 
| 4 | 94   | 1002  | 2     | 3 | 
| 5 | 93   | 1003  | 2     | 15 | 

表3：profit_table

| invoiceid | profit | cost | 
| 1001  | 200.00 | 980.00 | 
| 1002  | 100.00 | 700.00 | 
| 1003  | 350.00 | 900.00 | 

表4：product_log

| id | product_id | qty | tdate  | invoiceid | 
| 1 | 91   | 2 | 2017-01-10 | 1001  | 
| 2 | 92   | 3 | 2017-01-10 | 1001  | 
| 3 | 93   | 7 | 2017-02-10 | 1002  | 
| 4 | 94   | 3 | 2017-02-10 | 1002  | 
| 5 | 93   | 15 | 2017-03-10 | 1003  | 

我要總結（profit_table.profit），MONTH（product_log.tdate），SUM（sold_items.qty） 凡結果應該是明智的PRODUCT_CATEGORY和明智的月份和條件應該像YEAR（product_log.tdate）= 2017

示例result_view

| title  | MONTH(product_log.tdate) | sum(profit) |SUM(sold_items.qty) | 
| Electronics| 1      | 200   | 5     | 
| Kitchen | 2      | 100   | 10     | 
| Kitchen | 3      | 350   | 15     | 

請建議我一個正確的查詢

按我的研究成果會喜歡

SELECT r.totalqty, 
     f.profit, 
     p.mymonth, 
     c.title 
FROM (SELECT invoiceid,Sum(qty) totalqty,product_category_id 
     FROM sold_items 
     GROUP BY sold_items.product_category_id) AS r 
     LEFT JOIN (SELECT invoiceid,Sum(profit) profit FROM profit_table GROUP BY profit_table.invoiceid) AS f ON r.tid = f.tid 
LEFT JOIN (SELECT tid,DATE(tdate) mymonth FROM pstatements) AS p 
     ON r.invoiceid = p.invoiceid 
LEFT JOIN (SELECT id,title FROM product_category) AS c 
     ON r.product_category_id = c.id 
WHERE YEAR(p.mymonth)='2017' GROUP BY DATE(p.tdate) 

這不是一個正確的結果，如果你想回答仍然是一個線索

Answer 1

的下面寫的查詢應該可以工作您可以訪問sqlfiddle for this schema here。

select pc.title, month(pl.tdate), pt.profit, sum(si.qty) 
from product_category pc 
inner join sold_items si on si.product_category_id = pc.id 
inner join profit_table pt on pt.invoiceid = si.invoiceid 
inner join product_log pl on pl.invoiceid = pt.invoiceid 
where si.product_id = pl.product_id 
group by pc.title,pl.tdate 
order by month(pl.tdate) asc ; 

Answer 2

你應該使用一些JOIN和GROUP BY

select 
    product_category.title 
    , MONTH(product_log.tdate) 
    , sum(profit) 
    , SUM(sold_items.qty) 
from product_category 
left join sold_items on sold_items.product_category_id = product_category.id 
left join product_log on product_log.product_id = sold_items.product_id 
left join profit_table on profit_table.invoiceid = product_log.invoiceid 
group by product_category.title, MONTH(product_log.tdate) 

Answer 3

您將需要由產品和交易月加入他們的密鑰和組表。喜歡的東西下面：

select pc.title, month(pl.tdate) as tmonth, sum(pt.profit) as month_profit, sum(si.qty) as month_qty 
    from product_category pc 
    left join sold_items si 
    on si.product_category_id = pc.id 
    left join profit_table pt 
    on pt.invoice_id = si.invoice_id 
    left join product_log pl 
    on pl.product_id = si.product_id 
    and pl.invoice_id = si.invoice_id 
group by pc.id, month(pl.tdate) 
where year(pl.tdate) = '2017';