help writing SQL query including Join and Subquery

[baitmaster]

I’m working with SQL in Excel, and it’s working well. Now I want to add a new query that’s slightly more complex than the others and is outside my limited SQL comfort range.

I have 3 tables (worksheets):

• Table1 contains JourneyRef, RouteNum, DepTime, ArrTime
• Table 2 contains RouteNum, Origin & Destination
• Table 3 contains Location1, Location2 and timeTaken

RouteNum is the same in several tables. Location1 equates to Destination and Location2 equates to Origin

I want to find the whole record in table 1 where (DepTime less timeTaken) is the earliest possible but greater than a given time X
I can see I need to do some joins and probably a subquery but I’m unsure the best approach. Can anyone please write a single SQL query that will do this?

Thanks

 

[baitmaster]

I've made some progress and am nearly there but have encountered a couple of SQL error messages. I'm now at:

SELECT [J!JourneyRef], [J!RouteNum], [J!DepTime], [J!ArrTime], [J!DepTime] - [A!TimeTaken] AS Soonest
FROM (([journey_data$] J
LEFT JOIN [routes$] R
    ON ([J!RouteNum] = [R!RouteNum]))
LEFT JOIN [alternatives$] A
    ON ([A!Location1] = [R!Destination]))
WHERE [J!JourneyRef] is not null
ORDER BY Soonest;

The brackets were added around the FROM /JOIN clauses due to the error "syntax error (missing operator) in query expression..." and then I added some more brackets around the ON clauses due to the error "sql join expression not supported" as suggested by article found here

I'm still getting the error message "sql join expression not supported". Does anybody know why?

 

[baitmaster]

I get the same error with the much-simplified

SELECT [J!*] FROM ([journey_data$] J LEFT JOIN [routes$] R ON ([J!RouteNum] = [R!RouteNum]))