SQL Statement to Group results by two rows to create a timetable - php

Question

I currently have a database table which records the bookings of jobs
and there are 8 timeslots available
+-----------+
|tbl_booking|
+-----------+
|room_id |
|date |
|timeslot |
|booking |
+-----------+
sample data
+-----------+----------+-----------+
|room_id | date | timeslot |
+-----------+----------+-----------+
|1 |2018-01-01| 1 |
|1 |2018-01-01| 2 |
|1 |2018-01-01| 4 |
|2 |2018-01-01| 1 |
+-----------+----------+-----------+
intended outcome - when statement filters for bookings on 2018-01-01
+-----------+----------+-----------+----------+-----------+
|room |timeslot1 | timeslot2 |timeslot3 | timeslot4 |
+-----------+----------+-----------+----------+-----------+
|1 | X | X | | X |
|2 | X | | | |
+-----------+----------+-----------+----------+-----------+
i started off with this statement:
SELECT * from tbl_booking WHERE date = '2018-01-01' GROUP BY room_id
and this would return results to see the results grouped by rooms.
I would like to know where i should go from here to also have the results display it's timeslots that are shown in a table displaying the booking status of eacah room's timeslot in the day?
Should there be an SQL statement that i should be using or am I on the wrong track completely?
Any help would be appreciated.
Thank you!

Answer 1

What you want to do with the data isn't nice to do and if you have a fixed number of time slots then you can hardcode the columns like this:
SELECT room_id,
SUM(CASE WHEN timeslot = 1 then 1 else 0 END) AS Timeslot1,
SUM(CASE WHEN timeslot = 2 then 1 else 0 END) AS Timeslot2,
SUM(CASE WHEN timeslot = 3 then 1 else 0 END) AS Timeslot3,
SUM(CASE WHEN timeslot = 4 then 1 else 0 END) AS Timeslot4
FROM tbl_booking
GROUP BY room_id
(see SQL Fiddle)
You could use MAX if you just want to see if at least 1 booking exist
SQL to include remark, you can trick it to select the remark through a group by with MAX
SELECT room_id,
SUM(CASE WHEN timeslot = 1 then 1 else 0 END) AS Timeslot1,
MAX(CASE WHEN timeslot = 1 THEN remark ELSE '' END) AS Timeslot1Remark,
SUM(CASE WHEN timeslot = 2 then 1 else 0 END) AS Timeslot2,
MAX(CASE WHEN timeslot = 2 THEN remark ELSE '' END) AS Timeslot2Remark,
SUM(CASE WHEN timeslot = 3 then 1 else 0 END) AS Timeslot3,
MAX(CASE WHEN timeslot = 3 THEN remark ELSE '' END) AS Timeslot3Remark,
SUM(CASE WHEN timeslot = 4 then 1 else 0 END) AS Timeslot4,
MAX(CASE WHEN timeslot = 4 THEN remark ELSE '' END) AS Timeslot4Remark
FROM tbl_booking
GROUP BY room_id
your extended SQL Fiddle. This won't work for multiple dates only 1 selected date

Answer 2

If you are looking for dynamic solutions then you must need to use pivot table.
Select * from
(select * from yourtable) as
Temptable
Pivot (
Count(room)
For timeslot
In (list of timeslot))
As tempSlot
For more information check this link MySQL pivot table