Update & Inner Join How?

Best Greetings,

i want to make an update query for a table but the where clause will check a join with other talbe

update table1 inner join table 2 on x.table1=y.table2 and y.table1= y.table2
set z='anything'

or shall it be


update table1
set z='anything'
where x in (select x from table2) and y in (select y from table2)

i dont know how the syntax be any idea plz ,also table 2 it will be derived from table1 in the form of

select x,max(y)
from table1
order by x