mysql - 混合两个语句

Question

请帮助将这两个陈述混合到一个陈述中：

1. SELECT * FROM inventory WHERE {pro_status {1}} {pro_status {1}}

2. ='1' or loca_city ='2' ='usa'`

我需要声明1的结果来做声明2.

SELECT * FROM inventory WHERE

需要结果：

= 'tw' or loca_city

Answer 1

您需要将相应的过滤器与AND结合使用（注意在它们周围加上括号以强制执行所需的优先级）：

SELECT *
FROM   inventory
WHERE  (`pro_status`='1' or `pro_status`='2')
   AND (`loca_city` = 'hk' or `loca_city` = 'tw' or loca_city` = 'usa')

使用MySQL IN()运算符可以简化条件：

SELECT *
FROM   inventory
WHERE  pro_status IN (1,2)
   AND loca_city IN ('hk','tw','usa')

Answer 2

如果两个查询都在同一个表上且所有条件都是OR，您可以直接执行：

SELECT 
* 
FROM inventory 
WHERE `pro_status`='1' or `pro_status`='2' 
OR `loca_city` = 'hk' or `loca_city` = 'tw' or `loca_city` = '

Answer 3

SELECT * FROM inventory 
WHERE `pro_status`='1' 
   OR `pro_status`='2' 
   OR `loca_city` = 'hk' 
   OR `loca_city` = 'tw' 
   OR loca_city` = 'usa'