Question

我有这样的查询来计算我的location_id表中的member_location

$stat_location = Location::find()
    ->select([
        '*',
        'jum1' => MemberLocation::find()
            ->select(['COUNT(*)'])
            ->from('member_location') 
            ->where(['=','a.id','member_location.location_id']),
    ])
    ->alias('a')
    ->asArray()
    ->all();

，多数民众赞成在查询工作。在我的Location表中有一个capacity列，现在我想根据location_id表中的金额/计数member_location来获取是否为完整状态。我有这样的尝试查询

$stat_location = Location::find()
    ->select([
        '*',
        'jum1' => MemberLocation::find()
            ->select(['COUNT(*)'])
            ->from('member_location') 
            ->where(['=','a.id','member_location.location_id']),
        'status' => "(CASE WHEN jum1 > a.capacity THEN 'full'  ELSE  'available' END)",
    ])
    ->alias('a')
    ->asArray()
    ->all();

但是该查询给我一个错误

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'jum1' in 'field list'
The SQL being executed was: SELECT *, (SELECT COUNT(*) FROM `member_location` WHERE  (`a`.`id` = 'member_location.location_id')) AS `jum1`, (CASE WHEN jum1 > a.capacity THEN 'full' ELSE 'available' END) AS `status` FROM `location` `a`

有什么帮助吗？，谢谢

Answer 1

您不能在WHERE子句中使用SELECT语句中的别名。但是，您可以在HAVING子句中使用它。

或者，将子查询从SELECT语句移到左联接或内部联接。

使用Yii2 ActiveRecord在SELECT中进行子查询，计数和大小写

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