SQL update fields of one table from fields of another one

Question

I have two tables:

A [ID, column1, column2, column3]
B [ID, column1, column2, column3, column4]

A will always be subset of

Answer 1

Try Following

Update A a, B b, SET a.column1=b.column1 where b.id=1

EDITED:- Update more than one column

Update A a, B b, SET a.column1=b.column1, a.column2=b.column2 where b.id=1