Sql 与同一个表相关的两个外键

大家好，我想选择“end_date_service_fk”和“invoice_date_fk”，这是与同一个表“dim_time”相关的两个外键。我使用别名为e1和e2的SQL脚本来区分这两个外键，但它仍然没有返回正确的结果

你能帮我找到解决办法吗

SELECT
   sum(itics."service_price"),
   sum(itics."service_quantity"),
   engagement_code,
   engagement_name,
   functional_name,
   service_name,
   e1.day_date,
   e2.day_date
FROM
    spokes."fact_itics" itics INNER JOIN spokes."dim_engagement" ON itics."engagement_fk" = spokes."dim_engagement"."engagement_sk"
    INNER JOIN spokes."extra_fact_itics" ON itics."extra_fact_itics_fk" = spokes."extra_fact_itics"."extra_fact_itics_sk"
    INNER JOIN spokes."dim_service" ON itics."service_fk" = spokes."dim_service"."service_sk"
    inner join spokes."dim_time" e1 ON itics."end_date_service_fk" = e1."date_sk" 
    inner join spokes."dim_time" e2 on itics."invoice_date_fk" = e2."date_sk"
WHERE 
    e1.date_sk = e2.date_sk
GROUP BY
    engagement_code,
    engagement_name,
    functional_name,
    service_name,
    e1.day_date,
    e2.day_date

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结果有什么问题？还有，为什么结束日期服务和发票日期必须相等？这只意味着你不需要两次加入dim_time。