Find the distinct user in SQL Server Table Query

Question

Find the distinct user where he has logged in all the months from the given date has to be the current date, not consider the month.

Only the current date. Not current month

Find the distinct users who logged I every month

From the example, Aditya and Kumar logged in Jan. Feb, Mar, Apr so they are called as repeated users

So I need count as 2

New User: If a user logged in only only the latest week and never before is called as new user

Ex: Gopal is called as a new user as he logged only on April 26 and 28

 CREATE TABLE [dbo].[dbo.usagetracker]( [SNo] [nchar](10) NULL, [Username] [nvarchar](50) NULL, [LoginDate] [datetime2](7) NULL ) ON [PRIMARY] INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'1 ', N'Adhitya', CAST(N'2020-01-12T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'2 ', N'Selvam', CAST(N'2020-01-01T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'3 ', N'Kumar', CAST(N'2020-02-02T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'4 ', N'Adhitya', CAST(N'2020-02-02T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'5 ', N'Selvam', CAST(N'2020-02-12T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'6 ', N'Kumar', CAST(N'2020-02-02T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'7 ', N'Adhitya', CAST(N'2020-03-17T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'8 ', N'Selvam', CAST(N'2020-03-23T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'9 ', N'Kumar', CAST(N'2020-03-23T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'10', N'Kumar', CAST(N'2020-03-27T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'11', N'Kumar', CAST(N'2020-04-02T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'12', N'Kumar', CAST(N'2020-04-15T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'13', N' pal', CAST(N'2020-04-26T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'14', N' pal', CAST(N'2020-04-28T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'15', N'Adhitya', CAST(N'2020-04-28T00:00:00.0000000' AS DateTime2)) INSERT [dbo].[dbo.usagetracker] ([SNo], [Username], [LoginDate]) VALUES (N'16', N'Kumar', CAST(N'2020-01-15T00:00:00.0000000' AS DateTime2))

Answer 1

You can use aggregation and a having clause:

select username
from t
where logindate >= @date
group by username
having count(distinct year(logindate) * 100 + month(logindate)) = datediff(month, @date, logindate) + 1;

Actually, you can simplify that having clause to:

having count(distinct eomonth(logindate)) = datediff(month, @date, logindate) + 1;