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Editorial Team
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Asked: 2026-06-18T07:52:11+00:00

I am implementing booking tool for process. There is inventory you can use –

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I am implementing booking tool for process. There is inventory you can use – if you want to book process for a day AM and PM slot of this day is being used up. Then when calendar is being displayed, it brings all existing bookings showing for example that this room is not available in specific period of time.

Difficulty I am having is, that returned entries that are being displayed NOT in order so ‘AM’ slot after ‘PM’ slot. it all seem quite random it might be confusing for end user. 

SELECT * FROM 
(
select 

query to select room 1 where slot is AM

UNION ALL

query to select room 1 where slot is PM

UNION ALL

query to select room 2 ( this room can be booked only for whole day )

)

ORDER BY slot ASC

this is structure of query I used. It returns entries correctly but not in order. I presume it is due to nested select statements.

What is the best approach to solve this problem?

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1 Answer

  1. Editorial Team

    After losing hope to over come this problem I accidentally stumbled across solution for the problem. Basically Apex calendar rely on date column but if there more than one record assigned to one day then it display them in random order. Some people suggested adding another column to add some ordering into it, however this would produce another layer of complexity which is not necessary. Solution:

    SELECT ename, hiredate  +  rownum / 24 / 60 FROM 
(SELECT   ename, hiredate
    FROM emp
   ORDER BY ename)

    by adding rownum parameter to date column Apex can pick up difference between records and suddenly everything works as it should be with normal order by.

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