Question

Ok so i’m trying to return all information in a a month that preceeds the current month. I’m struggling slightly with the format and code. Here is my attempt.
I can provide table structure if needed

SELECT hd.Holiday_desc,
soh.Site_Name,
FROM   holiday_details hd
WHERE TRUNC(LAST_DAY(SYSDATE), 'MM' - 1) = TRUNC(hdep.Holiday_Departure, 'MM')
       INNER JOIN holiday_departure hdep 
               ON hd.holiday_code = hdep.holiday_code
Inner join site_visited sv on hd.Holiday_Code = sv.Holiday_code
inner join site_of_holiday soh on sv.Site_code = soh.Site_code

Answer 1

I think you want

SELECT 
  hd.Holiday_desc,
  soh.Site_Name
FROM   holiday_details hd
       INNER JOIN holiday_departure hdep 
               ON hd.holiday_code = hdep.holiday_code
       INNER JOIN site_visited sv 
               ON hd.Holiday_Code = sv.Holiday_code
       INNER JOIN site_of_holiday soh 
               ON sv.Site_code = soh.Site_code
WHERE 
  TRUNC(hdep.Holiday_Departure, 'MM') = ADD_MONTHS(TRUNC(SYSDATE, 'MM'), -1)

You’ll need to learn a bit about the syntax. 'MM' - 1 is not going to work, just as having a WHERE clause in the middle of your query. 🙂 Also, there was a comma to many just before FROM.