Question

select 
    d.name, 
    s.category,
    (select AVG(s.retail) 
     from stock s1 
     where s1.dealerID = s.dealerID 
           and (s1.category = 'TOYOTA' or s1.category = 'HONDA') as AVERAGE_SALE_PRICE 
from dealer d 
join stock s using (dealerID)

我有同样的问题：

Name | ContactName | Address | City | PostalCode | Country

Alfreds | Maria Anders | Path 57 | Berlin | 12209 | Germany

Ana | Ana Trujillo | Kanne 22 | México | 05021 | Mexico

通常我应该得到Ana ..但是我得到了那些数据集。出于任何原因，PostalCode没有意识。

Answer 1

您无法将OR和AND置于同一条件级别。保持逻辑你必须使用OR的括号，如下所示

SELECT * FROM Customers
WHERE (Country Like '*m*' Or City Like '*m*')
And PostalCode='05021';

Answer 2

这是@Parado

已发布变体的其他变体

SELECT  *
FROM    Customers
WHERE   (Country & City) LIKE '*m*'
         AND PostalCode = '05021'
-------------------------------------------------
SELECT  *
FROM    Customers
WHERE   (Country & City & PostalCode) = '*m*05021'
-------------------------------------------------
SELECT  *
FROM    Customers
WHERE   (Country + City + PostalCode) = '%m%05021'

SQL选择多个AND和OR出错

2 个答案: