MySQL显示错误数据

除了上面的问题，我想知道是否有任何方法可以优化这个MySQL语句

SELECT *
FROM `products`
WHERE
  `category` = 3073 OR
  `category` = 3074 OR
  `category` = 3100 OR
  `category` = 3102 OR
  `category` = 3106 OR
  `category` = 3109 OR
  `category` = 3111 OR
  `category` = 3115 OR
  `category` = 3130 OR
  `category` = 3134 OR
  `category` = 3144 OR
  `category` = 3146 OR
  `category` = 3152 OR
  `category` = 3157 OR
  `category` = 3162 OR
  `category` = 3163 OR
  `category` = 3164 OR
  `category` = 3166 OR
  `category` = 3167 OR
  `category` = 3168 OR
  `category` = 3170 OR
  `category` = 3171 OR
  `category` = 3177 OR
  `category` = 3181 OR
  `category` = 3182 OR
  `category` = 3184 OR
  `category` = 3190 OR
  `category` = 3191 OR
  `category` = 3192 OR
  `category` = 3213 OR
  `category` = 3224 OR
  `category` = 3227 OR
  `category` = 3228 OR
  `category` = 3235 OR
  `category` = 3238 OR
  `category` = 3239 OR
  `category` = 3240 OR
  `category` = 3244 OR
  `category` = 3245 OR
  `category` = 3246 AND
  `active` = 1 AND
  `price_notax` > 0 AND
  `deleted` = 0
ORDER BY `position` ASC
LIMIT 0, 24;

此语句还显示了price_notax字段值等于0的产品，为什么？我说过这个数字必须大于0

---

任何帮助都将不胜感激。

这是因为and优先于or，并且在您的声明中，只有最后一部分将and归为类别=3246。您需要在或零件周围放置支架

SELECT *
FROM products
WHERE category in (3073, 3074) -- and so on
AND `active` = 1
AND `price_notax` > 0 
AND `deleted` = 0 
ORDER BY `position` -- ASC is by default
LIMIT 0, 24

---

您的查询显示错误的结果，因为您使用了或和，所以如果只有一个条件为真，例如category=3100，那么它将显示它。

为什么不创建这些类别ID的数组，然后使用

    WHERE category IN somearray

---

当对WHERE子句求值时，任何OR子句为true都将使AND子句的状态不相关。若要更正此问题，必须将OR子句集用括号括起来，以便单独计算它们

但要以更高的可读性完成同样的事情，请使用IN子句，而不是：

SELECT * 
FROM products 
WHERE category IN (3073, 3074, 3100, 3102, 3106, 3109, 3111, 3115, 3130, 3134, 3144, 3146, 3152, 3157, 3162, 3163, 3164, 3166, 3167, 3168, 3170, 3171, 3177, 3181, 3182, 3184, 3190, 3191, 3192, 3213, 3224, 3227, 3228, 3235, 3238, 3239, 3240, 3244, 3245, 3246) 
AND active = 1 
AND price_notax > 0 
AND deleted = 0 
ORDER BY position ASC LIMIT 0, 24;

或优先级低于和

更正确的SQL：

SELECT * 
FROM `products` 
WHERE ( 
    `category` = 3073 OR `category` = 3074 OR `category` = 3100 OR 
    `category` = 3102 OR `category` = 3106 OR `category` = 3109 OR 
    `category` = 3111 OR `category` = 3115 OR `category` = 3130 OR 
    `category` = 3134 OR `category` = 3144 OR `category` = 3146 OR 
    `category` = 3152 OR `category` = 3157 OR `category` = 3162 OR 
    `category` = 3163 OR `category` = 3164 OR `category` = 3166 OR 
    `category` = 3167 OR `category` = 3168 OR `category` = 3170 OR 
    `category` = 3171 OR `category` = 3177 OR `category` = 3181 OR 
    `category` = 3182 OR `category` = 3184 OR `category` = 3190 OR 
    `category` = 3191 OR `category` = 3192 OR `category` = 3213 OR 
    `category` = 3224 OR `category` = 3227 OR `category` = 3228 OR 
    `category` = 3235 OR `category` = 3238 OR `category` = 3239 OR 
    `category` = 3240 OR `category` = 3244 OR `category` = 3245 OR 
    `category` = 3246 )
    AND `active` = 1 
    AND `price_notax` > 0 
    AND `deleted` = 0 
ORDER BY `position` ASC 
LIMIT 0, 24;

---

您应该将ORs和and分组。此外，为了使内容更具可读性，请使用IN语句而不是所有这些OR语句。