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How Could This SQL work?

edited Oct 9, 2014 1:08PM in SQL Language (MOSC) 8 commentsAnswered ✓

A developer gave this SQL to me for review. I am surprised that this query can somehow run successfully:

  SELECT DISTINCT CNTY_CD,

                  SPCLTY_CD,

                  NPI,

                  PRVDR_FCLTY_NM,

                  STREET_ADDRESS,

                  CITY,

                  ST_CD,

                  ZIP_CD,

                  APPLCTN_ID,

                  CNTRCT_ID,

                  HSD2_UPLD_ID,

                  HSD3_UPLD_ID,

                  CONTRACT_YR

    FROM HSD_Raw_Detail_Input r

   WHERE NPI IN (SELECT NPI

                   FROM (SELECT DISTINCT a.NPI, a.SPCLTY_CD

                           FROM HSD_Raw_Detail_Input A, HSD_SPCLTY_CD SP

                          WHERE a.SPCLTY_CD = sp.SPCLTY_CD AND sp.PRVDR_FCLTY_FL = 'P' AND CNTRCT_ID = 'H4975'

                          ORDER BY 1, 2

                        )

                   GROUP BY NPI

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