连接表达式中的MS Access 2007 SQL语法错误

Question

I am trying to join four tables and I am getting the error 'Syntax error in Join Expression'

Please find below the query I am presently trying to write

SELECT a.*,
switch(a.[Start Date] between b.[SEASON1START] and b.[SEASON1END],b.[LRA_S1_RT1_SGL],
a.[Start Date] between c.[SEASON1START] and c.[SEASON1END],c.[LRA_S1_RT1_SGL],
a.[Start Date] between d.[SEASON1START] and d.[SEASON1END],d.[LRA_S1_RT1_SGL]) as [Negotiated Rate Local],
switch(a.[Start Date] between b.[SEASON1START] and b.[SEASON1END],
b.[RATE_CURR],a.[Start Date] between c.[SEASON1START] and c.[SEASON1END],c.[RATE_CURR],
a.[Start Date] between d.[SEASON1START] and d.[SEASON1END],d.[RATE_CURR]) as [Negotiated Currency]
FROM ((([Q1001 - Split Transactions] a 
left join [2014 Negotiated Rate] b on (a.[RX_ID] = b.[PROPCODE] And YEAR(a.[Start Date] = 2014))
left join [2015 Negotiated Rate] c on (a.[RX_ID] = c.[PROPCODE] And YEAR(a.[Start Date] = 2015)) 
left join [2016 Negotiated Rate] d on (a.[RX_ID] = d.[PROPCODE] And YEAR(a.[Start Date] = 2016)) ;

Answer 1

MS Access does not permit constants in the on clause. The solution? Switch to a better database. Oh wait. That isn't always an option. So, subqueries to the rescue:

FROM ((([Q1001 - Split Transactions] a left join
        (SELECT b.*, 2014 as yyyy FROM [2014 Negotiated Rate] as b
        ) as b
        on a.[RX_ID] = b.[PROPCODE] And YEAR(a.[Start Date]) = b.yyyy
       ) left join
       (SELECT c.*, 2015 as yyyy FROM [2015 Negotiated Rate] as c
       ) as c
       on a.[RX_ID] = c.[PROPCODE] And YEAR(a.[Start Date]) = c.yyyy
      ) left join
      (SELECT d.*, 2016 as yyyy FROM [2016 Negotiated Rate] as d
      ) as d
      on a.[RX_ID] = d.[PROPCODE] And YEAR(a.[Start Date]) = d.yyyy
     ) 

Answer 2

Your original query should work. In MS Access, you can have expressions in ON clauses like WHERE clauses (though intricate expressions will not be viewable in Design View only in SQL View ).

Specifically, you are not wrapping the YEAR() function properly. Consider the following adjustment:

FROM ((([Q1001 - Split Transactions] a 
left join [2014 Negotiated Rate] b 
      on (a.[RX_ID] = b.[PROPCODE] And YEAR(a.[Start Date]) = 2014))
left join [2015 Negotiated Rate] c 
      on (a.[RX_ID] = c.[PROPCODE] And YEAR(a.[Start Date]) = 2015)) 
left join [2016 Negotiated Rate] d 
      on (a.[RX_ID] = d.[PROPCODE] And YEAR(a.[Start Date]) = 2016));