Create date column from 3 strings in SQL - sql

Question

I have a table with 3 columns:
(integer) (integer) (varchar(50))
Month Year Color
1 2019 Blue
1 2019 Yellow
1 2019 Red
2 2019 Blue
2 2019 White
My end goal is to be able to make a query like this:
Select Color from table where (cast(concat(Year,'/',Month,'/1') as date)>='01/Jan/2019' and cast(concat(Year,'/',Month,'/1') as date)<'1/Mar/2019')
What i want is to be able to create a date from the columns i have in order to do a query within a range of dates.
I tried making the date with this query but it gives me this error:
Select cast(concat(Year,'/',Month,'/1') as date) from table
Conversion failed when converting date and/or time from character string.
Solution:
This is the final query that i used to get the dates in a Fiscal Year from Oct-2017 to Sep-2018.
select distinct(DATEFROMPARTS(y,m,1))
from table
where
(DATEFROMPARTS(y, m, 1) >= cast('2017-10-01' as date)) and (DATEFROMPARTS(y, m, 1) < cast('2018-10-01' as date))
order by DATEFROMPARTS(y,m,1)
Edit
Edited to switch cast to datefromparts
select distinct(DATEFROMPARTS(y,m,1))
from table
where
(DATEFROMPARTS(y, m, 1) >= DATEFROMPARTS(2017, 10, 1)) and (DATEFROMPARTS(y,m, 1) < DATEFROMPARTS(2018, 10, 1))
order by DATEFROMPARTS(y,m,1)

Answer 1

You can use datefromparts():
select color
from table
where
datefromparts(year, month, 1) >= cast('20190101' as date)
and datefromparts(year, month, 1) < cast('20190301' as date)
Or:
where
datefromparts(year, month, 1) >= datefromparts(2019, 1, 1)
and datefromparts(year, month, 1) < datefromparts(2019, 3, 1)
Since you are forcing the date to the first date of the month, you could also use between like so:
select color
from table
where datefromparts(year, month, 1)
between cast('20190101' as date) and cast('20190201' as date)
Or:
where datefromparts(year, month, 1)
between datefromparts(2019, 1, 1) and datefromparts(2019, 2, 1)
Note that for this date range, you could as well do simple number comparison:
where year = 2019 and month in (1, 2)
However if your date range spans over multiple years, this will get tedious and require a more complex expression.