Question

我构建了以下查询并在其中使用了MySQL的 COUNT函数。

查询是：

SELECT COUNT(`id`) FROM `users` WHERE `gender` = 'Female' AND `sub_by` = 'Self' AND `country` = 'Pakistan' AND `religion` = 'Christian' AND `ma_status` = 'Single' AND `occupation` = 'Unemployed'

稍后在我的脚本中我使用PHP的函数 mysql_result（）和 mysql_fetch_assoc ，并且它们都给我错误消息，这意味着问题不在于mysql_result （）和mysql_fetch_assoc（），但问题出在查询中，

错误消息是：

警告：mysql_result（）期望参数1为资源，第76行的C：\ wamp \ www \ practice3 \ search2.php中给出布尔值

警告：mysql_fetch_assoc（）期望参数1为资源，第87行的C：\ wamp \ www \ practice3 \ search2.php中给出布尔值

任何人都可以告诉我查询中的真正问题是什么。

Answer 1

mysql_result()返回false

不要使用'\'

正确的查询是

SELECT COUNT(`id`) 
  FROM `users` WHERE `gender` = 'Female' 
   AND `sub_by` = 'Self' 
   AND `country` = 'Pakistan' 
   AND `religion` = 'Christian' 
   AND `ma_status` = 'Single' 
   AND `occupation` = 'Unemployed'

Answer 2

SELECT COUNT(\`id\`) FROM \`users\` WHERE \`gender\` = 'Female' AND \`sub_by\` = 'Self' AND \`country\` = 'Pakistan' AND \`religion\` = 'Christian' AND \`ma_status\` = 'Single' AND \`occupation\` = 'Unemployed'

should be

SELECT COUNT(`id`) FROM `users` WHERE `gender` = 'Female' AND `sub_by` = 'Self' AND `country` = 'Pakistan' AND `religion` = 'Christian' AND `ma_status` = 'Single' AND `occupation` = 'Unemployed'

Answer 3

使用以下查询替换您的查询

SELECT COUNT(`id`) FROM `users` WHERE `gender` = 'Female' AND `sub_by` = 'Self' AND `country` = 'Pakistan' AND `religion` = 'Christian' AND `ma_status` = 'Single' AND `occupation` = 'Unemployed'

这是您的新查询，这将为您提供所需的确切结果。

在PHP字符串中使用单引号或双引号时使用

反斜杠，但在使用撇号（`）时永远不能使用。

MySQL查询COUNT函数，带有mysql_result和mysql_fetch_assoc

3 个答案: