Re: How do I code this in a SQL SELECT?

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1)  Is it F1A or F1C that equals F2A+F2B+F2C?
2)  Joins.  Do you want records from FILE1 if there is no match in FILE2?
Do you want records from FILE2 if there is no match in FILE3?  Or does
your Referential Integrity definitions absolutely prevent this from
happening?  (I doubt it, since you haven't normalized the F1? field to
match the fields in FILE2).


Rob Berendt
--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
Benjamin Franklin




"Mark Phippard" <MarkP@softlanding.com>
Sent by: midrange-l-admin@midrange.com
04/03/2002 10:59 AM
Please respond to midrange-l


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        Subject:        How do I code this in a SQL SELECT?


Consider the following three file definitions:

FILE1
F1A    PK    10
F1B          40
F1C          10

FILE2
F2A    PK     4
F2B    PK     4
F2C    PK     2
F2D          40
F2E           1
F2F          10

FILE3
F3A    PK     1
F3B          10
F3C           1

Files 1 and 2 could be joined by either combining the three key fields in
FILE2, or substringing the one field into the three subfields.

Files 2 and 3 can be joined by fields F2E and F3A.

Now, how can I do a SQL SELECT where I get the following fields:

F1A
F1B
F1C
F2F
F3B

Where F1C = "XYZ" and F3C = "Y'

With all of the proper joins being honored, etc...?

Thanks

Mark




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