Question

I have a MySQL table with the following fields:

id, morning, evening, event, other-fields

For about one week, each day some event will occur either in morning or in evening. Thus the events are recorded in the table with the “day-number” stored in “morning” or “evening” field(if the event is to occur in morning, then morning field contains the “day-number” and evening field contains 0. and vise-versa). These entries are not made sequence-wise or day wise but as per the user’s own will.

I need to fetch these records in proper order i.e. Sort the records day-wise in ascending order and records of each day need to be sorted session-wise(i.e. morning first and then evening ones).

Please help with an idea to order the data on these two fields.

Following is some sample data for three days:

id,     mor,       even,     otherstuff....
1         1          0
2         3          0
3         3          0
4         2          0
5         3          0
6         3          0
--------------------------
7         0          1
8         0          2
9         0          3
10        0          3
----------------------

Following is the same above data in the format I need to fetch it:

id,      mor,       even,     otherstuff....
1         1          0
2         0          1
--------------------------
3         2          0
4         0          2
------------------------
5         3          0
6         3          0
7         3          0
8         3          0
9         0          3
10        0          3

Answer 1

If one of them is always zero, the day number will be equal to mor + even so you can sort by that.

select *
from your_table
order by (mor + even), even;

Since even = 0 for “day” records, they will appear before any “even” records on the same day number.