Update values from one table in another

Question

I have tables A,B and C. I need to select certain values from all rows in Table A and then for every row in A, I need to update values in Table B and Table C.

Pseudo Code would look like this:

 SELECT A1, A2, A3, A4 FROM Table A 
           UPDATE Table B SET B2=A2, B3=A3, B4=A4 WHERE B1 = A1;
           UPDATE Table C SET C2=A2, C3=A3, C4=A4 WHERE C1 = A1;

How can I achieve this?

Answer 1

In Oracle, you would use two update statements:

update b
    set (b2, b3, b4) = (select a2, a3, a4 from a where a.a1 = b.b1);

update c
    set (c2, c3, c4) = (select a2, a3, a4 from a where a.a1 = c.b1);