How can I build a date from 3 columns of float datatype?

Question

I am using SQL Server 2014 and I have a table (t1) which has the following 3 columns:

DAY   MONTH    YEAR
 2      11     2021
 1      10     2021
 12     10     2021
 22     09     2021

All the 3 columns have a float datatype.

What would be the t-sql code to build a date from these 3 columns in the following format (YYYY-MM-DD):

CREATEDDATE
2021-11-02
2021-10-01
2021-10-12
2021-09-22

I have tried looking around for other questions similar to mine but I could not find a solution.

Any help would be appreciated.

Answer 1

The DATEFROMPARTS() function is an option ( ... returns a date value that maps to the specified year, month, and day values ):

SELECT DATEFROMPARTS([YEAR], [MONTH], [DAY])
FROM (VALUES
    (2,  11, 2021),
    (1,  10, 2021),
    (12, 10, 2021),
    (22, 09, 2021)
) t ([DAY], [MONTH], [YEAR])

Or with the actual table:

SELECT DATEFROMPARTS([YEAR], [MONTH], [DAY])
FROM t1