带有 2 个表的嵌套选择查询

Question

我有2个数据表，我需要回答以下问题

“哪些患者在 2018 年有药房保险但从未配过处方？”

--处方索赔数据集--

claim_id    hvid         date_service
191592860   934968097   1/15/2018
185972358   69871984    1/10/2018
805452300   405853776   1/5/2020
185972358   220235342   1/15/2019

--覆盖数据集--

hvid           date_start       date_end    benefit_type
347327518   8/1/2008    7/31/2019   MEDICAL
934968097   10/22/2009  10/31/2017  PHARMACY
69871984    8/1/2004    12/31/2018  PHARMACY

尝试编写嵌套查询但无法获取任何结果

Answer 1

SELECT c.hvid
FROM Coverage c
LEFT JOIN PrescriptionClaims p ON c.hvid = p.hvid AND YEAR(p.date_service) = 2018
WHERE c.benefit_type = 'PHARMACY'
  AND YEAR('2018-01-01') BETWEEN YEAR(c.date_start) AND YEAR(c.date_end)
  AND p.hvid IS NULL;