Question

I have small table

Create Table TestDates
(
  TestDateId int identity (1,1),
  RunDateTime DateTime
)

I will insert some values to the table

Insert into TestDates
(RunDateTime)
Values
(getdate())

Insert into TestDates
(RunDateTime)
Values
( DATEADD(DAY,  -1, GETDATE()))

Insert into TestDates
(RunDateTime)
Values
( DATEADD(DAY,  -2, GETDATE()))

Insert into TestDates
(RunDateTime)
Values
( DATEADD(DAY,  -3, GETDATE()))

Insert into TestDates
(RunDateTime)
Values
( DATEADD(Hour,  -34, GETDATE()))

Insert into TestDates
(RunDateTime)
Values
( DATEADD(Hour,  -12, GETDATE()))

I manage to execute distinct query that brings me only time

SELECT DISTINCT 
DATENAME(hour, RunDateTime) + ':' + 
DATENAME(mi, RunDateTime) AS  DistinctDate
from TestDates

But I need to indicate times that appears today or yesterday

For example

DistinctDate   IsToday   IsYesterday

10:33           N          Y
20:31           Y          N
8:33            N          N

Please help

Answer 1

Can use a case statement with a datediff.

SELECT DISTINCT 
DATENAME(hour, RunDateTime) + ':' + 
DATENAME(mi, RunDateTime) AS  DistinctDate,
CASE WHEN DATEDIFF(day, RunDateTime, GETDATE()) = 0 THEN 'Y' ELSE 'N' END IsToday,
CASE WHEN DATEDIFF(day, RunDateTime, GETDATE()) = 1 THEN 'Y' ELSE 'N' END IsYesterday
from TestDates