Question

对于给定的prcs_id，prcs_run_id，multicast_id，我需要来自multicast_message_recovery_processed端点的消息的消息ID和端点不在multicast_endpoints表的端点列表中。

数据 -

multicast_endpoints

prcs_id prcs_run_id multicast_id endpoint_id

100     1           multiX       destA

100     1           multiX       destB

100     1           multiX       destC

100     1           multiX       destD

100     1           multiY       destX

100     1           multiY       destY

multicast_message_recovery_processed

prcs_id prcs_run_id multicast_id message_id endpoint_id

100     1           multiX       1          destA

100     1           multiX       2          destB

100     1           multiX       1          destC

100     1           multiY       1          destX

对于给定的prcs_id = 100, prcs_run_id = 1, multicast_id = multiX，查询应返回：

1 destB
1 destD
2 destA
2 destC
2 destD

这实际上意味着消息1未到达destB和destD，而消息2未到达destA，destC和destD。

 CREATE TABLE multicast_message_recovery_processed
    (
      prcs_id character varying NOT NULL,
      prcs_run_id bigint NOT NULL,
      multicast_id character varying NOT NULL,
      message_id bigint,
      endpoint_id character varying NOT NULL,
      CONSTRAINT multicast_message_recovery_processed_pkey PRIMARY KEY (prcs_id , prcs_run_id , multicast_id , endpoint_id )
    )

    CREATE TABLE multicast_endpoints
    (
      prcs_id character varying NOT NULL,
      prcs_run_id bigint NOT NULL,
      multicast_id character varying NOT NULL,
      endpoint_id character varying NOT NULL,
      CONSTRAINT multicast_endpoints_pkey PRIMARY KEY (prcs_id , prcs_run_id , multicast_id , endpoint_id )
    )

Answer 1

好吧，这看起来很丑陋，而且可能有更好的方式来写这个，但是，我觉得它有效，希望它会成为你改进的起点：

SELECT DISTINCT p.message_id, e.endpoint_id AS endpoint_id
FROM dbo.multicast_endpoints e CROSS JOIN dbo.multicast_message_recovery_processed p
     LEFT JOIN 
     (SELECT p.message_id, p.endpoint_id AS process_endpoint_id, e.endpoint_id AS endpoint_id
      FROM dbo.multicast_endpoints e CROSS JOIN dbo.multicast_message_recovery_processed p
      WHERE  e.prcs_id = p.prcs_id  AND  e.prcs_run_id = p.prcs_run_id AND e.multicast_id = p.multicast_id 
      AND p.endpoint_id = e.endpoint_id
     ) t ON p.message_id = t.message_id AND e.endpoint_id = t.endpoint_id
WHERE  e.prcs_id = p.prcs_id  AND  e.prcs_run_id = p.prcs_run_id AND e.multicast_id = p.multicast_id 
  AND e.prcs_id = '100' AND e.prcs_run_id = 1 AND e.multicast_id = 'MultiX' AND t.message_id IS NULL
ORDER BY message_id

SQL中的新手。获取消息和未处理的端点

1 个答案: