Question

Can I get mean of all numbers returned in a subquery? For example, I need to attach mean of all ‘y’ from another table which has ‘x’ less than the current row’s ‘x’.

Something like –

select a.x,
mean(b.y where b.x<a.x from data2 b) as m_y
from data1 a

It’s not working. What is the right syntax (or trick) for getting the result?

Answer 1

Never mind, I got it.

select a.x,
select(mean(b.y) where b.x<a.x from data2 b) as m_y
from data1 a

My sql rusted with nonuse.