yii2 determines that the database field is not empty

yii2 determines whether the database field is null, as follows:

Related tutorial recommendations: yii framework

Example:

$query = new Query;              
$query->select('ID, City,State,StudentName') 
      ->from('student')                                
      ->where(['IsActive' => 1]) 
      ->andWhere(['not', ['City' => null]]) 
      ->andWhere(['not', ['State' => null]]) 
      ->orderBy(['rand()' => SORT_DESC])       
      ->limit(10);

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