Combiner deux requêtes MySQL à une

Question

Est-il possible de combiner ces deux requêtes en une seule requête?

SELECT sum(amount) as credit FROM statement WHERE userId= '33003' AND debitOrCredit = '1' AND actionDate <= '2012-10-17'; 

SELECT sum(amount) as debit FROM statement WHERE userId= '33003' AND debitOrCredit = '0' AND actionDate <= '2012-10-17'; 

donc j'obtenir le résultat:

| credit | debit | 
| 90 | 60 | 

Answer 1

Vous pouvez utiliser CASE au sein de votre SUM:

SELECT sum(CASE WHEN debitOrCredit = '1' THEN amount ELSE 0 END) as credit, 
     sum(CASE WHEN debitOrCredit = '0' THEN amount ELSE 0 END) as debit 
FROM statement WHERE userId= '33003' AND actionDate <= '2012-10-17'; 

Answer 2

utilisation CASE dans votre SELECT clause

SELECT sum(CASE WHEN debitOrCredit = '1' THEN amount ELSE 0 END) as credit, 
     sum(CASE WHEN debitOrCredit = '0' THEN amount ELSE 0 END) as debit 
FROM statement 
WHERE userId= '33003' AND 
     actionDate <= '2012-10-17'; 

Answer 3

Utilisez comme ça.

SELECT sum(a.amount) as credit,sum(b.amount) as debit FROM statement a left join statement b 
on a.userId=b.userId 
WHERE a.userId= '33003' AND a.debitOrCredit = '1' AND b.debitOrCredit = '0' AND a.actionDate <= '2012-10-17' AND b.actionDate <= '2012-10-17' ; 

- Mark a répondu si cette réponse répond à votre question ...

Answer 4

Essayez cette

SELECT sum(case when debitOrCredit = '1' then amount else 0 end) as credit, sum(case when debitOrCredit = '2' then amount else 0 end) as debit FROM statement WHERE userId= '33003' AND actionDate <= '2012-10-17'

Answer 5

Merci pour votre aide. Voici comment je l'ai utilisé dans le Zend Framework:

$sql = $this->_dba->select() 
    ->from('statement', array(
     "credit" => "sum(CASE WHEN debitOrCredit = '1' THEN amount ELSE 0 END)", 
     "debit" => "sum(CASE WHEN debitOrCredit = '0' THEN amount ELSE 0 END)")) 
    ->where('userId = ?', $userId) 
    ->where('actionDate <= ?', $date); 

    try 
    { 
     $result = $this->db->fetchRow($sql); 
     //process result here  
    } 
    catch (Exception $e) 
    { 
     throw new Exception("Error on ...... "); 
    }