Question

我在理解为什么我的OR语句不能产生我想要的结果时遇到了问题。

if ($result = $mysqli->query("SELECT 
orderheader.ordernumber As Order_Number
, ccilog.orderid AS Order_ID
, orderheader.billingcontactfirstname AS Customer_Name
, orderheader.billingcontactlastname AS Customer_Surname
, orderheader.billingcustomeremailaddress AS Customer_Email
, orderheader.webbrandcode AS Brand_Code
, orderitems.productname AS Product_Name
, orderitems.qty AS Item_Qty
, orderheader.datecreated AS Order_Date 
FROM orderheader 
LEFT JOIN ccilog ON orderheader.id=ccilog.orderid
LEFT JOIN orderitems ON ccilog.orderid=orderitems.orderid 
WHERE orderitems.status = '0' 
AND orderheader.status != '1'
AND orderitems.webbrandcode = 'brand1' || orderitems.webbrandcode = 'brand2' 
AND orderheader.billingcustomeremailaddress != 'email1@email.co.uk'
AND orderheader.billingcustomeremailaddress != 'email2@email.co.uk'
"))

如果我删除该行：

AND orderitems.webbrandcode = 'brand1' || orderitems.webbrandcode = 'brand2'

我的结果显示确定，我的规则显示Brand1,2和3.当我添加上面的行时，我希望看到相同的结果，但没有品牌3.品牌3没有显示哪个是伟大的，但它似乎现在它列出了所有品牌2，而不仅仅是前一个订单状态陈述为真的行。

我无法理解为什么我的结果不仅仅是返回我期望的11个结果（它返回425）几乎是Brand 2的大部分结果。

Answer 1

你在OR子句周围缺少括号......它应该是：

(orderitems.webbrandcode = 'brand1' || orderitems.webbrandcode = 'brand2')

如果你没有放入parens，那么约束会使用运算符优先级关联，这可能不是你想要的！

Answer 2

试试这个：

if ($result = $mysqli->query("SELECT 
orderheader.ordernumber As Order_Number
, ccilog.orderid AS Order_ID
, orderheader.billingcontactfirstname AS Customer_Name
, orderheader.billingcontactlastname AS Customer_Surname
, orderheader.billingcustomeremailaddress AS Customer_Email
, orderheader.webbrandcode AS Brand_Code
, orderitems.productname AS Product_Name
, orderitems.qty AS Item_Qty
, orderheader.datecreated AS Order_Date 
FROM orderheader 
LEFT JOIN ccilog ON orderheader.id=ccilog.orderid
LEFT JOIN orderitems ON ccilog.orderid=orderitems.orderid 
WHERE orderitems.status = '0' 
AND orderheader.status != '1'
AND (orderitems.webbrandcode = 'brand1' || orderitems.webbrandcode = 'brand2')
AND orderheader.billingcustomeremailaddress != 'email1@email.co.uk'
AND orderheader.billingcustomeremailaddress != 'email2@email.co.uk'
"))

请参阅：

您还可以组合AND和OR（使用括号形成复数表达式）。

SELECT * FROM Persons WHERE
LastName='Svendson'
AND (FirstName='Tove' OR FirstName='Ola')

- ＆GT; http://www.w3schools.com/sql/sql_and_or.asp

Answer 3

试试这个

....AND orderheader.status != '1'
AND ( orderitems.webbrandcode = 'brand1' || orderitems.webbrandcode = 'brand2' )
AND orderheader.billingcustomeremailaddress != 'email1@email.co.uk'...

PHP查询使用WHERE，AND＆amp;或声明问题

3 个答案: