[Koha] Which table contains the holding information?

Dear all, I am using Koha 3.2. I want to know which table in Koha database contains the holding status (available/unavailable)? I just have taken a look, but couldn't point out the table I am looking for. Is it specifically mentioned in any table? Or do I've to query multiple tables and calculate the number of items that are available? How Koha displays that information? Please give me a clue. Thank you. -- Altaf Mahmud System Programmer Ayesha Abed Library BRAC University Bangladesh.