date_trunc month in SQL Server

Question

I want to extract the "month" from the date_contact column. I tried select dateadd(mm, datediff(mm,0, date_contact), 0) from cohort and select cast(date_contact As Date) . I received result that is same as date from the first method. And for the second method I got error message: date_contact is not a valid name .

Answer 1

select datepart(mm,date_contact) from cohort

aka..

select month(date_contact) from cohort

or...

select datename(mm,date_contact) from cohort

Answer 2

Simply use MONTH() function

SELECT MONTH(date_contact)
FROM YourTable;

Which will return the month number, and if you want to return the month name, then you can use DATENAME() function

SELECT DATENAME(Month, date_contact)
FROM YourTable;

OR

SELECT CONVERT(VARCHAR(3), date_contact, 100)
FROM YourTable;

Answer 3

select dateadd(day,-(day(getdate())-1),cast(getdate() as date))