Complex Query, Many Joins...

May 1, 2008

Ok I have a complex query that works great, but now I need to join yet another table but the problem is, the value that links it to the rest of the query is a value that is returned from a case statement earlier in the query...

For Example...

SELECT var1, var2, var3,
CASE T1.Number WHEN 0 THEN T2.Result ELSE T3.Result END as var4
FROM TABLE1 T1
LEFT OUTER JOIN TABLE2 T2 on T2.Value=T1.Value
LEFT OUTER JOIN TABLE3 T3 on T3.Value=T1.Value2

Above is a generalized, much smaller example of my working Query.
Now what I need to do is join TABLE4 but the value I need to connect it to the rest of the query is var4, which can come from 2 different places depending on the value of T1.Number

Basically the logic I need to make it work is to either have a case statement in my JOIN. Like, 'LEFT OUTER JOIN TABLE4 on T4.Value=(CASE T1.Number WHEN 0 THEN T2.Result ELSE T3.Result END)'

Is this even possible and if so, how? I need to keep the logic in the main query to preserve performance...

Thank you in advance,

Casey

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Hi,

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[check to show the options below] Profile ABC
[check to shore more options] Type 1




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B. ditto
C. ditto
D. ditto
[check to show more options] Type 2





A. Contains fields for entering another data string and selecting from drop-down boxes
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C. ditto
D. ditto
[check to show more options] Type 3





A. Contains fields for entering another data string and selecting from drop-down boxes




B. ditto
C. ditto
D. ditto
[check to select more options] Type 4





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C. ditto
D. ditto
[check to show more options] Profile XYZ (as above)
[check to select more options] Profile STU (as above)

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-------------------------------------------------------------------------
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[JE Query]
ID, EntryDate, Comment, Income, Expense


ID, EntryDate and Comment are all easily returned from the [Journal] table. The problem I am having is with the Income and Expense fields. For the Income field, I want to SUM the Journal_Split.Amount fields where Journal_Splts.JEID = Journal.ID AND where Journal_Splits.Type = 1 (1 being the code for Income). The Expense field is just the same, except the Journal_Splits.Type will be equal to 2. When the query is done there should only be as many rows as there are in the [Journal] table, for the [Journal_Splits] table can contain up to 3 records for each [Journal] record. [Journal_Splits] just holds the individual amounts split out to different income/expense categories for a single transaction.

This to me has a lot of conditions that I can't even seem to build with access's query builder (yes I am using access for now.. will change over to sql at a later time).

Anyone have a good idea how to do this? Or have a better idea for structuring the database to make is easier to query? Right now I have it working, but instead of an Amount field, I have 1 Income and 1 Expense field, but since a transaction can only be either income or expense, one field will always be 0, which seems like a waste of space.

That may be a bit confusing so let me know if I can clarify. Much appreciated.

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