how to combine queries yii2 - activerecord

Question

I have a query with 2 tables. I want to combine these two queries into one query. how do?
public function actionGroup()
{
$query1 = (new \yii\db\Query())
->select(['lao',new \yii\db\Expression('COUNT(lao)'),'nama_ptgs', new \yii\db\Expression('SUM(outstanding)')])
->from('debitur')
->groupBy('lao')
->all();
$query2 = (new \yii\db\Query())
->select(['lao', new \yii\db\Expression('SUM(tgt_pergeseran)')])
->from('resume')
->groupBy('lao')
->all();
return $this->render('outstanding', [
'query1' => $query1,
'query2' => $query2,
]);
}
example sql
SELECT debitur.lao, debitur.Outstanding, debitur.jumlah, resume.Target FROM ( SELECT lao, SUM(outstanding) as Outstanding, COUNT(lao) as jumlah FROM debitur GROUP BY lao )debitur INNER JOIN ( SELECT lao, SUM(tgt_pergeseran) as Target FROM resume GROUP BY lao ) resume ON debitur.lao = resume.lao
error undefined index
print($query);
result

Answer 1

The raw query you provided does not have any where() condition for the main query
SELECT debitur.lao, debitur.Outstanding, debitur.jumlah, resume.Target
FROM
(SELECT lao, SUM(outstanding) as Outstanding, COUNT(lao) as jumlah FROM debitur GROUP BY lao) debitur
INNER JOIN
(SELECT lao, SUM(tgt_pergeseran) as Target FROM resume GROUP BY lao) resume
ON debitur.lao = resume.lao
If that is the complete and correct query that show you the right results in the phpmyadmin widow, you need to use the sub query like below
$subQueryFrom = new \yii\db\Query();
$subQueryFrom->select(['lao', new \yii\db\Expression('SUM(outstanding) as Outstanding, COUNT(lao) as jumlah')])
->from('debitur')
->groupBy('lao');
$subQueryJoin = new \yii\db\Query();
$subQueryJoin->select(['lao', new \yii\db\Expression('SUM(tgt_pergeseran) as Target')])
->from('resume')
->groupBy('lao');
$query = new \yii\db\Query();
$results = $query->select(['debitur.lao', 'debitur.Outstanding', 'debitur.jumlah', 'resume.Target'])
->from(['debitur' => $subQueryFrom])
->innerJoin(['resume' => $subQueryJoin], 'debitur.lao = resume.lao')
->all();
You can now use the $result in your view which holds the records against your query.
return $this->render('outstanding', [
'results' => $results,
]);

Answer 2

In order to combine the results from 2 queries from 2 different tables you can use the Union Operator. From the link there are necessary conditions though:
Each SELECT statement within UNION must have the same number of
columns
The columns must also have similar data types
The columns in each SELECT statement must also be in the same order
In order for this to work for you, you need to alter your queries as follows:
$query1 = (new \yii\db\Query())
->select(['lao',
new \yii\db\Expression('COUNT(lao) as count_column'),
'nama_ptgs',
new \yii\db\Expression('SUM(outstanding) as sum_column'),
new \yii\db\Expression('NULL as tgt_sum')])
->from('debitur')
->groupBy('lao');
$query2 = (new \yii\db\Query())
->select(['lao',
new \yii\db\Expression('NULL as count_column'),
new \yii\db\Expression('NULL as nama_ptgs'),
new \yii\db\Expression('NULL as sum_column'),
new \yii\db\Expression('SUM(tgt_pergeseran) as tgt_sum'),
])->from('resume')
->groupBy('lao');
In short if your first table contains columns a and b, and your second contains columns a and c. Then what you need to do is select(['a','b','NULL as c']) from the first and select(['a','NULL as b','c']) from the second so that you can combine the two results
Then the combined query is simply:
$combinedQuery = $query1->union($query2);