Question

I am trying to retreive the value of a specific column from a table, from the latest row (I have an a.i id column).

What query would need to be written in order to accomplish this?

So far I have…

$lots = Yii::app()->db->createCommand()
                  ->select('MAX(id) as num_lots')
                  ->from('my_table')
                  ->queryRow();

Answer 1

SELECT column_name FROM table_name ORDER BY id DESC LIMIT 1

i.e. take the value from the first row of a table sorted by id in descending order.

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EDIT:

As for your editted code – MAX(id) as num_lots in the SELECT clause selects the maximum value from the id column but that’s probably not what you want.

In Yii you’d probably use something like this:

$lots = Yii::app()->db->createCommand()
  ->select('column_name')
  ->from('my_table')
  ->order('id desc')
  ->limit(1)
  ->queryRow();