关系数据库联接仅显示一行

Question

我有SQL查询：

SELECT B.branchNumber, B.buildingName, SUM(CASE WHEN PI.offerPrice > 0 THEN PI.offerPrice * PI.quantity ELSE price * PI.quantity END) AS total
FROM `purchase` 
INNER JOIN `product` on purchase.productCode = product.productCode 
INNER JOIN `branch` B on purchase.branchNumber = B.branchNumber 
INNER JOIN `purchase info` PI on purchase.productCode = PI.productCode AND purchase.purchaseID = PI.purchaseID 

这只返回一个total因为INNER JOIN仅显示具有total的匹配列。 当我删除：

SUM(CASE WHEN PI.offerPrice > 0 THEN PI.offerPrice * PI.quantity ELSE price * PI.quantity END) AS total

它返回几行。 我如何获得此结果以返回total s的所有行？

Answer 1

您似乎在语句末尾缺少"GROUP BY B.BranchNumber, B.BuildingName"子句