How does one retrieve records with all days in date range covered? - sql

Question

Imagine you have something like a action rental or hotel scenario where a unit can have rates for specific days and they can be available or not. I want to be able to search all my units for a specified arrival date and departure date to only bring back units that meet the whole time period.
Lets say each unit has a rate table similar to below
PropertyID Rate Start_Date End_Date Status Type
1 400 03/12/18 03/13/18 Available Daily
1 400 03/13/18 03/14/18 Available Daily
1 400 03/14/18 03/15/18 Available Daily
1 400 03/15/18 03/16/18 Reserved Daily
1 400 03/16/18 03/17/18 Available Daily
1 400 03/17/18 03/18/18 Available Daily
1 400 03/18/18 03/19/18 Available Daily
1 900 03/12/18 03/19/18 Blocked Weekly
Daily rates are split into each day due to the fact you can book a day at any time while a weekly rate needs the full range available. In the above case, it turns out that I would NOT be able to rent the weekly rate as the 15 day is reserved and that is part of the weekly rate.
If someone were to search that they wanted to stay 3/12/18 to 3/19/18 and assuming all of the above was available, I have it it doing in a store procedure (pseudo code)
Select stuff
From Property
Inner Join PropertyRate pr
where pr.Start_Date = #arrrivalDate And pr.End_Date = #departureDate
This would get me the property back because the weekly rate fits. However if the weekly rate was removed and it was only the daily rates, this would not return this property. Assuming all the statuses were available for the daily rates, this property should return because each day of the period specified is available.
How can I check if each day in the requested date range has an available date for that time period?
If it matters, this is Microsoft SQL Server 2014.
Edit 1:
It was requested for table definitions. Here is the property rate table create script:
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[PropertyRates]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[PropertyRates](
[property_rate_id] [int] IDENTITY(1,1) NOT NULL,
[rate_details_id] [int] NOT NULL,
[property_id] [int] NOT NULL,
[rate] [money] NOT NULL,
[start_date] [date] NOT NULL,
[end_date] [date] NOT NULL,
[status] [varchar](20) NOT NULL,
[created] [datetime] NOT NULL,
CONSTRAINT [PK_PropertyRates] PRIMARY KEY CLUSTERED
(
[property_rate_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
END
GO
SET ANSI_PADDING OFF
GO
I believe that is what was asked.
Edit 2:
I wasn't very clear on what I'm trying to do for an output. Since this SQL is used in a search function, I only want to return the SINGLE property record for the property if it has available rates on every day of the passed in search range. So the end SQL should just have the property record if the many rates for that property are available and cover every day in the passed in date range.
Also note, that besides daily and weekly rates, there are also other such as monthly, bi-monthly, daily 2 day min, etc but they all have the start and end date columns filled in.
So for the above example, for a stay from 3/12 to 3/19, I should NOT get the property back because there is no range of days covered by available because the weekly rate is blocked and the daily rate has a reserved in the middle. If the reserved rate changed to available, the property should be returned.

Answer 1

select propertyid,count(*)
from property
where count(*) = datediff(dd,#startenddate, #enddate)+1
and status='Available'
group by propertyid
This will calculate the number of days requested (datediff) and calculate if there are that number of days in the table that are available.

Answer 2

UNION ALL could be a good way to handle this:
DECLARE #ArrivalDate Date = '20180312'
DECLARE #DepartureDate Date = '20180319'
SELECT *
FROM myTable t1
JOIN (SELECT PropertyID, Type --Handle Weekly Availability
FROM myTable
WHERE Type = 'Weekly'
AND Status = 'Available'
AND Start_Date = #ArrivalDate
AND End_Date = #DepartureDate
UNION ALL
SELECT PropertyID, Type --Handle Daily Availability
FROM myTable
WHERE Type = 'Daily'
AND Status = 'Available'
AND Start_Date >= #ArrivalDate
AND End_Date <= #DepartureDate
GROUP BY PropertyID, Type
HAVING COUNT(DISTINCT Start_Date) = DATEDIFF(Day, #ArrivalDate, #DepartureDate)
) t2 ON t1.PropertyID = t2.PropertyID --JOIN back to retrieve other needed data
AND t1.Type = t2.Type
Fiddle example here
Note, I changed the sample data to have one valid daily and one valid weekly example.