How does sql server group and count all data by quarter?

The principle of grouping by month is the same!

Group by month

The difference between quarterly grouping and monthly grouping should be the difference of time period!

Choice? Case? whenmonth(date)= 1？ Or? Month (date)? =2?

Or? Month (date) =3? then what The first quarter?

whenmonth(date)=4？ Or? Month (date)? =5?

Or? Month (date) =6? then what Q2?

whenmonth(date)=7？ Or? Month (date)? =8?

Or? Month (date) =9? then what The third quarter?

whenmonth(date)= 10？ Or? Month (date)? = 1 1?

Or? Month (date) = 12? then what The fourth quarter?

Or what? ''? End? , total (quantity)

From where? Table?

Group? pass by

Case? whenmonth(date)= 1？ Or? Month (date)? =2?

Or? Month (date) =3? then what The first quarter?

whenmonth(date)=4？ Or? Month (date)? =5?

Or? Month (date) =6? then what Q2?

whenmonth(date)=7？ Or? Month (date)? =8?

Or? Month (date) =9? then what The third quarter?

whenmonth(date)= 10？ Or? Month (date)? = 1 1?

Or? Month (date) = 12? then what The fourth quarter?

Or what? ''? end