How to use Left join instead of inner join - sql-server

Question

I have written the following query, that joins a table with already joined tables. I have basically used inner join using SQL Server. I am wondering how to modify the below code to use Left join rather than inner join?
The below query has three tables Blended, BOUND_TAB and RECORD
The second thing is, I also need to filter the results such that I use policies with deductibleinUSD > 0 in 'Blended' table or Primary_R Type = 'Deductible' and Primary_R Amount > 0 from the inner select. This should provide me the policies in my final results if either 'Blended' or 'BOUND_TAB' indicates that it has a deductible.
select
c.MPolicyNumber,
c.SNumber,
c.InsuredName,
c.EffDate,
c.Renewal,
c.GPremiumUSD,
c.Status,
c.deductibleinUSD, t.*
from
IT.dbo.Blended c
inner join
(select distinct
a.[Policy Number], a.[LOB],
a.[Primary_R Amount] as Bound_deductibles,
a.[Primary_R Type],
a.[EffDate] as CAS_EffDate
from
IT.dbo.BOUND_TAB a
inner join
IT.dbo.RECORD b on a.idxFile = b.[Bound Rater]
where
a.[Primary Retention Amount] > 0) t on t.[Policy Number] = c.MPolicyNumber
where
c.deductibleinUSD > 0
and c.ProductLine in ('Health','Cas')
order by
c.EffDate
Thanks in advance !

Answer 1

Without example data and an example of desired results, this is the best I can guess based on your question:
select
c.MPolicyNumber
, c.SNumber
, c.InsuredName
, c.EffDate
, c.Renewal
, c.GPremiumUSD
, c.Status
, c.deductibleinUSD
, t.*
from IT.dbo.Blended c
left join (
select distinct
a.[Policy Number]
, a.[LOB]
, a.[Primary_R Amount] as Bound_deductibles
, a.[Primary_R Type]
, a.[EffDate] as CAS_EffDate
from IT.dbo.BOUND_TAB a
inner join IT.dbo.RECORD b
on a.idxFile = b.[Bound Rater]
where a.[Primary Retention Amount] > 0
) as t
on t.[Policy Number] = c.MPolicyNumber
and c.ProductLine in ('Health','Cas')
and (c.deductibleinUSD > 0
or (Primary_R Type = 'Deductible'
and Bound_deductibles > 0
)
)
order by c.EffDate