Question

一切似乎都运转良好，突然之间我在前端得到了这个错误：

致命错误：带有消息的未捕获异常'PDOException' 'SQLSTATE [21000]：基数违规：1242子查询返回更多在/var/www/html/system/home.php:78堆栈跟踪：＃0 /var/www/html/system/home.php(78）：PDOStatement-＆gt; execute（）＃1 {main} 在第78行的/var/www/html/system/home.php中引用

在Workbench下，我之前创建的每个VIEW都会发出此错误：Mysql Error code: 1242 Subquery returns more than 1 row.

以下是一个给出错误的代码示例。

SELECT 
    `teams`.`id` AS `id`,
    `teams`.`name` AS `team_name`,
    `teams_and_captains_view`.`captain` AS `captain`,
    IF((`teams`.`gender` = 'M'),
        'Male',
        'Female') AS `gender`,
    (SELECT 
            `categories`.`name`
        FROM
            `categories`
        WHERE
            (`categories`.`id` = `teams`.`category_id`)) AS `category`,
    `teams`.`category_id` AS `category_id`,
    `teams`.`slogan` AS `slogan`,
    `teams`.`location` AS `location`,
    `teams`.`description` AS `description`,
    `teams`.`phone` AS `phone`,
    `teams`.`email` AS `email`,
    `teams`.`tournament_id` AS `tournament_id`,
    (SELECT 
            COUNT(`players`.`id`)
        FROM
            `players`
        WHERE
            (`players`.`team_id` = `teams`.`id`)) AS `players`,
    `teams_and_captains_view`.`captain_id` AS `captain_id`
FROM
    (`teams`
    LEFT JOIN `teams_and_captains_view` ON ((`teams`.`id` = `teams_and_captains_view`.`id`)))

当我使用LIMIT时似乎有效，但我不能使用LIMIT。

提前谢谢

Answer 1

当您的子查询返回时，将返回错误代码1242 不止一行进行比较。

请检查您是否错误地插入了任何重复数据。

http://dev.mysql.com/doc/refman/5.7/en/subquery-errors.html

Mysql错误代码：1242子查询返回超过1行

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