表锁读写ALIAS

Question

我试图得到这个工作，但得到一个错误t_write was not locked.

我更新山坳make从最高值的山坳snsn + 1

LOCK TABLES 1_makes AS t_read READ, 1_makes as t_write WRITE; 

UPDATE t_write 
SET 
    make = 'Pioneer', 
    sn = (SELECT 
      * 
     from 
      (SELECT 
       MAX(sn) 
      FROM 
       t_read 
      WHERE 
       id <> 0) as new_sn) + 1 
WHERE 
    id = 2; 

UNLOCK TABLES; 

Answer 1

如何这一点：

LOCK TABLES 1_makes WRITE, 1_makes AS t_read READ; 

UPDATE 1_makes 
SET 
    make = 'Pioneer', 
    sn = (SELECT 
      * 
     from 
      (SELECT 
       MAX(sn) 
      FROM 
       1_makes AS t_read 
      WHERE 
       id <> 0) as new_sn) + 1 
WHERE 
    id = 2; 

UNLOCK TABLES;