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Views: 1860 | Replies: 1
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Join Date: Apr 2005
Posts: 8
Reputation: 
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Solved Threads: 0
Newbie Poster
Please, please, help me out in rewriting my sub-query to some kind of JOIN for earlier MySQL version:
The query should retrive any availble rooms from the database
MY ATTEMPTED SUB-QUERY:
Select *
From Room R
Where R.room_no
NOT
IN(
Select B.room_no
From R.room_no = B.room_no
And R.room_type = ‘single’
And B.arrival_date = ‘2005-03-23’
And B.departure_date = ‘2005-04-30’
)
My ATTEMPTED JOIN: not working correctly
Select *
From room R, booking B
Where R.room_no = B.room_no
And R.room_type = ‘single’
And B.arrivel_date = ‘2005-04-23’
And B.departure_date=’2005-04-30’
I welcome any better ideaa or comments.
For your information, this are the TABLES in my database:
Room (room_ no, room_ type, price)
Guest (guest_ no, Fname, Sname, address)
Booking (room_no, guest_no, Fname, Sname, arrival_date,
departure_date, emp_no, user_name, password)
Employee (emp_no, Fname, Sname, user_name, password)
Admin (admin_no, Fname, Lname, user_name, password)
I hope to hear from you soon folks. Thanks
The query should retrive any availble rooms from the database
MY ATTEMPTED SUB-QUERY:
Select *
From Room R
Where R.room_no
NOT
IN(
Select B.room_no
From R.room_no = B.room_no
And R.room_type = ‘single’
And B.arrival_date = ‘2005-03-23’
And B.departure_date = ‘2005-04-30’
)
My ATTEMPTED JOIN: not working correctly
Select *
From room R, booking B
Where R.room_no = B.room_no
And R.room_type = ‘single’
And B.arrivel_date = ‘2005-04-23’
And B.departure_date=’2005-04-30’
I welcome any better ideaa or comments.
For your information, this are the TABLES in my database:
Room (room_ no, room_ type, price)
Guest (guest_ no, Fname, Sname, address)
Booking (room_no, guest_no, Fname, Sname, arrival_date,
departure_date, emp_no, user_name, password)
Employee (emp_no, Fname, Sname, user_name, password)
Admin (admin_no, Fname, Lname, user_name, password)
I hope to hear from you soon folks. Thanks
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Join Date: Jan 2005
Posts: 18
Reputation:
Rep Power: 4
Solved Threads: 2
Newbie Poster
Hi
I would add a 'group by' and add the date to the return so you know what date the return is telling you about. But without knowing the column types I am a bit lost as to how I would do the grouping / ordering! What I mean is that you can pull stuff from table booking and add it to each row returned from table room!
demo
I would add a 'group by' and add the date to the return so you know what date the return is telling you about. But without knowing the column types I am a bit lost as to how I would do the grouping / ordering! What I mean is that you can pull stuff from table booking and add it to each row returned from table room!
SELECT * FROM room AS r LEFT JOIN booking AS b ON ( r.room_no = b.room_no AND r.room_type = 'single' ) WHERE b.arrivel_date = '2005-04-23' AND b.departure_date = '2005-04-30'
demo
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