Twee waar voorwaarde voor dezelfde kolom met behulp van group by

Ik denk dat dit de zoekopdracht is die u zoekt:

SELECT t1.branch_name, 
       COALESCE(SUM(send.vqty), 0) AS send, 
       COALESCE(SUM(receive.vqty), 0) AS received 
FROM t1  
LEFT JOIN t2 AS send on t1.id = send.VBRNCH  
LEFT JOIN t2 AS receive on t1.id = receive.VTOBRN 
GROUP BY t1.branch_name

Demo hier