sql - Column is invalid in the select list due to it is not contained in either an aggregate function or the GROUP BY clause -


i'm trying order count each month each year, found there several related functions helpful.

first datepart(m, orderdate), datepart(y, orderdate), wrote code follows:

select datepart(q, orderdate) q , datepart(year, orderdate) y, count(*) count  orders  group datepart(q, orderdate), datepart(y, orderdate);

but has error: column 'orders.orderdate' invalid in select list because not contained in either aggregate function or group clause.

then, tried use month(dateorder), , year(dateorder) , code follows:

select month(orderdate) m , year(orderdate) y, count(*) count  orders  group month(orderdate),year(orderdate);

the result of above code shows success.

my question why first code has error second code correct? thanks!

because in select have used datepart(year, orderdate) searching year part, , in group have datepart(y, orderdate) - y not short year stand dayofyear

https://docs.microsoft.com/en-us/sql/t-sql/functions/datepart-transact-sql

short year yy

query work :

select datepart(q, orderdate) q , datepart(year, orderdate) y, count(*) count  orders  group datepart(q, orderdate), datepart(yy, orderdate);

you can see in demo - using yy give 2017 today, using y give 230 - it's 230th day in year


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