आप कर सकते हैं
SELECT SUM(netto)
FROM invoices
LEFT JOIN invoices_elements
ON invoices_elements_code_invoices_id = invoices_id
AND invoices_elements_enable = 1
WHERE invoices_enable = 1
GROUP BY invoices_elements_code_invoices_id
प्रतिबंध पर ध्यान दें invoices_elements_enable = 1
ON
में है क्वेरी को inner join
में बदलने से बचने के लिए क्लॉज ।