Question

我有一个删除语句，用于删除数据库中的20000条记录。这20000条记录中的每一行都满足两个条件：id = x和new_tracking_number = y。详情如下：

DELETE FROM tracking_number_pool WHERE (
    (id=88 AND new_tracking_number='LPT99') OR 
    (id=87 AND new_tracking_number='LPT98') OR 
    (id=86 AND new_tracking_number='LPT97') OR 
    (id=85 AND new_tracking_number='LPT96') OR 
    (id=84 AND new_tracking_number='LPT95') OR 
    ...
    (id=72 AND new_tracking_number='LPT83') 
);

当我在生产环境中运行上面的delete语句时，完成执行需要很长时间。我想知道如何提高删除操作的效率。

Answer 1

你可以尝试

DELETE FROM 
tracking_number_pool
WHERE (id, new_tracking_number) in (
  (78319988, 'LPT0000001699999'),
  (78319986, 'LPT0000001699997'),
  ..
)

SQL delete where子句

1 个答案: