oracle - SQL Insert calculated average value from another table -

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i tried insert calculated average table table writing sql below didnt work. can please me out ? how can write stored procedure in oracle cater many states i.e. ca, il, ga, wi.... ? 

 insert employee(averagesalary, averagetax)   (select avg(salary), avg(tax)    hrdeptemployee     state = 'ny')

leave off parentheses around select, not subselect.

edit: second question in comment (error: null value of id column of target table):

add id insert select list (assuming want use id 1):

insert employee(id, averagesalary, averagetax) select 1, avg(salary), avg(tax)   hrdeptemployee   state = 'ny'

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