Question

我试图在访问的sql视图中做一些复杂的连接，而且我很难知道为什么我会收到错误。我更熟练地在SQL本身中使用SQL连接，并且在提供错误时，访问的SQL视图确实令人困惑。我不知道我需要做些什么才能解决这个错误。请参阅下文。

SELECT Table1.PAT_NAME AS PATNM, 
       Table1.PAT_MRN_ID AS MRN, 
       Table2.Start_Date AS StartDT, 
       Table2.END_date AS ENDDT, 
       Table2.episode_ID AS EPSDID, 
       Table2.POS_NAME AS POS, 
       Table3.READMITDT AS READMITD
FROM Table2 
    LEFT JOIN ( Table1 ON Table2.PAT_MRN_ID = Table1.PAT_MRN_ID)
    JOIN (Table3 ON Table1.PAT_ID = Table3.PATIDR AND
         ( Table3.READMITDT <= dateadd("d", 1, isnull(Table2.END_DATE,NOW())
          OR Table3.READMITDT < dateadd("d", 30, Table2.START_DATE))
          AND Table3.READMITDT >= Table2.start_date))

Answer 1

这是一个问题......

JOIN (Table3 ON Table1.PAT_ID = Table3.PATIDR
^^^^

Access SQL不单独接受JOIN。您必须始终指定所需的联接类型：INNER JOIN; LEFT JOIN;或RIGHT JOIN。

使用查询设计器的设计视图（而不是SQL视图）来设置连接。查询设计者知道保持db引擎满意的语法规则。稍后，您可以切换回SQL View以查看有效联接的表示方式。

Access SQL将LEFT OUTER JOIN识别为LEFT JOIN的同义词，将RIGHT OUTER JOIN识别为RIGHT JOIN。在查询设计器中编辑查询时，它可能会丢弃OUTER，但您可以在不中断工作查询的情况下将其添加回来。

考虑将这些DateAdd条件移到查询的WHERE子句中。

Answer 2

it is better to use WHERE Clause after join operation. remove 'and'

JOIN Table3 ON (Table1.PAT_ID = Table3.PATIDR) AND
      (Table3.READMITDT <= dateadd("d", 1, isnull(Table2.END_DATE,NOW())
      OR Table3.READMITDT < dateadd("d", 30, Table2.START_DATE) 
      AND Table3.READMITDT >= Table2.start_date))

should be


JOIN Table3 ON (Table1.PAT_ID = Table3.PATIDR) 
WHERE
      (Table3.READMITDT <= dateadd("d", 1, isnull(Table2.END_DATE,NOW())
      OR Table3.READMITDT < dateadd("d", 30, Table2.START_DATE) 
      AND Table3.READMITDT >= Table2.start_date))

Answer 3

我对ms access sql并不熟悉。但我认为LEFT JOIN应该是LEFT OUTER JOIN并且你的括号错了。在JO子句之前的表之后应该打开Join括号看下面的例子

FROM Table2 LEFT JOIN（Table1 ON Table2.PAT_MRN_ID = Table1.PAT_MRN_ID）应更改为
FROM Table2 LEFT OUTER JOIN Table1 ON（Table2.PAT_MRN_ID = Table1.PAT_MRN_ID）

Answer 4

我通过语法检查器https://sql.treasuredata.com/运行它。此版本没有语法错误。

SELECT
  Table1.PAT_NAME AS PATNM
 ,Table1.PAT_MRN_ID AS MRN
 ,Table2.Start_Date AS StartDT
 ,Table2.END_date AS ENDDT
 ,Table2.episode_ID AS EPSDID
 ,Table2.POS_NAME AS POS
 ,Table3.READMITDT AS READMITD
FROM
  Table2
  LEFT OUTER JOIN Table1 ON (Table2.PAT_MRN_ID = Table1.PAT_MRN_ID)
  JOIN Table3 ON (Table1.PAT_ID = Table3.PATIDR) AND
      (Table3.READMITDT <= dateadd("d", 1, isnull(Table2.END_DATE,NOW())
      OR Table3.READMITDT < dateadd("d", 30, Table2.START_DATE) 
      AND Table3.READMITDT >= Table2.start_date))

加入操作上的语法错误 - 访问2013中的sql视图

4 个答案: