访问包含 FIRST() 的 SQL 查询转换

Question

我正在将 MS Access 查询转换为 SQL 服务器存储过程。我到了这一点：

SELECT 
    AuthNum, AuthStatus, DateCreated, 
    MIN(DateInitiated) AS DateInitiated, 
    EventClassification, 
    FIRST(PlaceOfService) AS PlaceOfService, 
    Lob, MemId, 
    MAX(NoticeDate) AS NoticeDate, 
    MAX(Tat) AS Tat, 
    FIRST(StaffId) AS StaffId
FROM 
    PA_TAT_Detailed
GROUP BY 
    AuthNum, AuthStatus, DateCreated, EventClassification, Lob, MemId
HAVING
    ((FIRST(PlaceOfService) <> 'Inpatient Hospital') 
     AND (FIRST(PlaceOfService) <> 'Office - Dental') 
     AND (FIRST(PlaceOfService) <> 'Dialysis Center'))
    AND 
    ((MAX(Tat) Is Null) OR ((MAX(Tat) >= 0) AND (MAX(Tat) <= 28)))
ORDER BY 
    AuthNum;

但是我不知道如何转换FIRST运算符。有什么想法吗？我是否需要添加与 GROUP BY 关联的 ORDER BY 以便我可以 TAKE 1？

在这种情况下 MIN 是否给出相同的结果？

顺便说一句，PlaceOfService、StaffId 是字符串。

Answer 1

像这样的东西应该很接近了。仔细检查此 returns 信息是否正确。

SELECT top 1 AuthNum
    , AuthStatus
    , DateCreated
    , MIN(DateInitiated) AS DateInitiated
    , EventClassification
    , PlaceOfService
    , Lob
    , MemId
    , MAX(NoticeDate) AS NoticeDate
    , MAX(Tat) AS Tat
    , StaffId
FROM PA_TAT_Detailed
where PlaceOfService not in ('Inpatient Hospital', 'Office - Dental', 'Dialysis Center')
GROUP BY AuthNum
    , AuthStatus
    , DateCreated
    , EventClassification
    , PlaceOfService
    , Lob
    , MemId
    , StaffId
HAVING MAX(Tat) Is Null 
    OR (MAX(Tat) >= 0 AND MAX(Tat) <= 28)
ORDER BY AuthNum;

访问包含 FIRST() 的 SQL 查询转换

Access to SQL Query Conversion containing FIRST()

sql

sql-server

ms-access

sql-server-2008