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Firebird Subquery

Posted on 2008-10-14
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Last Modified: 2013-12-09
Good day

I would like to know how can I do the following subquery.

I have two tables and my data looks like this

Table A
Suite  [PK]
Week [PK]
RoomStatus

Table B
Suite  [FK]
Week [FK]
HomeRoom

example of data in table A
Suite    Week    RoomStatus
A         1           OPEN
B         2           OPEN
C         3           CLOSE


Example of data in table B

Suite  Week     HomeRoom
A       1            A
B       1            C
C       1            B

Now in my select I want to select everything from table B, but I want to get for each row the person actual RoomStatus from table a.

for example row 1 in table B, the guest HomeRoom  = the Suite where he is currently in,
but row two The guest are in Room B but his HomeRoom is C ( I need now in this select his RoomStatus from table a)

If possible I want to use a subquery to perform this select because I need to perform a lot of additional sql once I got the data.

Thank you
Henry
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Question by:henryreynolds
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Accepted Solution

by:
NickUpson earned 125 total points
ID: 22718863
I believe this will be easier to achieve with a stored procedure, then you can do the addditonal sql on the server as well

select b.Suite, b.Week, b.HomeRoom, a.roomstatus from tableb b join tablea a on b.homeroom = a.suite and b.week = a.week
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Author Comment

by:henryreynolds
ID: 22719072
Hi NickUpson

I already have it in a store procedure to do the additional sql, the idea of yours wont work 100% because there could be rooms empty or in maintenance and then they dont have a homeroom.

thanx

henry
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LVL 19

Expert Comment

by:NickUpson
ID: 22719329
so if they have a homeroom you want the status for that, if they don't you want what? (null, status of room they are in, something else)
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LVL 40

Assisted Solution

by:Sharath
Sharath earned 125 total points
ID: 23119165
check this
select b.Suite, b.Week, b.HomeRoom, a.roomstatus from tableb b left join tablea a on b.homeroom = a.suite and b.week = a.week

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