Question

我必须将表ProdBiscuit作为tb和StockData作为sd，我必须得到StockData（quantite）中数量的总和，条件为if（sd.status＆gt; 0和sd.prodid = tb.id AND sd .matcuisine = 3）

这是我的SQL查询

 SELECT tb.id, tb.nom, tb.proddate, tb.qty, tb.stockrecno 
 FROM ProdBiscuit AS tb
 JOIN 

(SELECT id, prodid, matcuisine, status, SUM(quantite) AS rq FROM StockData) AS sd
 ON (tb.id = sd.prodid AND sd.status > 0 AND sd.matcuisine = 3) LIMIT 25 OFFSET @Myid

这根本不给我任何行？

ProdBiscuit中只有3行，Stockdata中只有11行，StockData中只有2行符合条件。

如图所示，只有两行给出了条件。

Image of two tables

我的查询有什么问题？

PS：图像上的绿线显示我查询中的条件。

Answer 1

请检查一下。如果您没有得到想要的结果，请转到SQLFiddle.com并使用数据创建示例表，以便更容易找出您想要的结果。

SELECT tb.id, tb.nom, tb.proddate, tb.qty, tb.stockrecno, SUM(sd.quanite)
FROM ProdBiscuit AS tb
JOIN StockData AS sd
  ON tb.id = sd.prodid
WHERE sd.status > 0 AND sd.matcuisine = 3
GROUP BY tb.id, tb.nom, tb.proddate, tb.qty, tb.stockrecno

Answer 2

SELECT tb.id, tb.nom, tb.proddate, tb.qty, tb.stockrecno, SUM(quantite)  As rq

FROM ProdBiscuit AS tb 

JOIN StockData AS sd  ON (tb.id = sd.prodid AND sd.status > 0 AND sd.matcuisine = 3)
OR (tb.id = sd.prodid AND sd.status = 0 AND sd.matcuisine = 3)  
GROUP BY tb.id, tb.nom, tb.proddate, tb.qty, tb.stockrecno

这个查询给了我这个

ID  NOM                    QTY      RQ
1   Biscuit Chocolat       100      100
2   Biscuit Moutarde       120      226
3   Biscuit Pain Epice     100      100

AND Happy End在@AgRizzo的帮助下我做了一些修改并添加了准确的显示：

SELECT tb.id, tb.nom, tb.proddate, tb.qty, tb.stockrecno, 

SUM(IF((status>0 AND tb.id=sd.prodid),quantite,0))  As rq FROM ProdBiscuit AS tb 

JOIN StockData AS sd  ON (tb.id = sd.prodid AND sd.status > 0 AND sd.matcuisine = 3)
OR (tb.id = sd.prodid AND sd.status = 0 AND sd.matcuisine = 3)  
GROUP BY tb.id, tb.nom, tb.proddate, tb.qty, tb.stockrecno



ID  NOM                    QTY      RQ
1   Biscuit Chocolat       100      100
2   Biscuit Moutarde       120       14
3   Biscuit Pain Epice     100      100

Code for displaying the "rq" is:

QtyLst.Items.Add((Convert.ToInt16(reader["qty"])- Convert.ToInt16(reader["rq"])).ToString());

通过比较两个表来获得总和

2 个答案: