mysql - 考虑参数子集的选择

Question

我有下表订单，其中包含列:

• order_id,
• 时间戳，
• worker_id,
• costumer_id,
• start_ts,
• end_ts

根据start_ts、end_ts、worker_id和costumer_id的任意组合查询数据库的最佳方式是什么？?

如果省略 start_ts 我会:

SELECT *
  FROM Orders
  WHERE timestamp <= end_ts
    AND worker_id = <worker_id>
    AND costumer_id = <costumer_id>;

如果省略 worker_id 和 costumer_id:

SELECT *
  FROM Orders
  WHERE timestamp BETWEEN start_ts AND end_ts;

Answer 1

您可以组合多个条件，如下所示:

SELECT * 
  FROM Orders 
  WHERE (timestamp >= <start_ts> or <start_ts> is null)
    AND (timestamp <= <end_ts> or <end_ts> is null)
    AND ... ;

Where ... 表示任意多个 WHERE 条件，根据需要使用 AND 进行组合。