php - MySQL - 如果 id 存在则更新表

Question

我正在尝试从不同的表中更新两个：

$query = "UPDATE ".$SupportTicketsTable." a ,".$SupportUserTable." b 
SET a.ticket_status=0, 
    b.solved_tickets= CASE WHEN a.ticket_status!='0' THEN (b.solved_tickets+1) ELSE b.solved_tickets END , 
    b.assigned_tickets= CASE  WHEN a.ticket_status!='0' AND b.assigned_tickets>=1 THEN (b.assigned_tickets-1) ELSE b.assigned_tickets END ,
    a.ticket_status='0' 
    WHERE a.enc_id=? AND b.id=a.operator_id";

但这仅在 b.id 存在时才有效，否则它不会做任何事情，但我的目标是更新 tick a.ticket_ststus。
我尝试使用OR而不是，AND但它返回重复键错误或更新错误b.assigned_ticket。
提前感谢

编辑

感谢您提供的信息，我尝试过这样的事情：

$query = "UPDATE a
        SET 
            b.solved_tickets= CASE WHEN a.ticket_status!='0' THEN (b.solved_tickets+1) ELSE b.solved_tickets END , 
            b.assigned_tickets= CASE  WHEN a.ticket_status!='0' AND b.assigned_tickets>=1 THEN (b.assigned_tickets-1) ELSE b.assigned_tickets END ,
            a.ticket_status=0
        FROM ".$SupportTicketsTable." a
        LEFT OUTER JOIN ".$SupportUserTable." b
        ON b.id=a.operator_id
        WHERE a.enc_id=? ";

但它说之前有一个错误FROM ".$SupportTicketsTable." a，但我不明白它错了什么

Answer 1

已解决（感谢帮助）：

 $query = "UPDATE ".$SupportTicketsTable." a
                LEFT OUTER JOIN ".$SupportUserTable." b
                ON b.id=a.operator_id
                SET 
                    b.solved_tickets= CASE WHEN a.ticket_status!='0' THEN (b.solved_tickets+1) ELSE b.solved_tickets END , 
                    b.assigned_tickets= CASE  WHEN a.ticket_status!='0' AND b.assigned_tickets>=1 THEN (b.assigned_tickets-1) ELSE b.assigned_tickets END ,
                    a.ticket_status='0'
                WHERE a.enc_id=? ";