My sql update statement is not filling my column

Question

I have two tables A and B.

Table A has columns:
LI
PC (key)
CI (key)
DI
TM
V
AI (no data in this column at this time)

Table B has columns:
PC (key)
CI (key)
CT
CS
CV
AI

I would like to update Table A so that A.AI = B.AI
The update statement I wrote is as follows:

     Update A
        Set A.AI *= B.AI
       From A, B
      where A.PC *= B.PC
        And A.CI *= B.CI

When I attempted to test this I used the SQL statement:

     Select A.*
       From A, B
      Where A.CI *= B.CI
      And A.PC *= B.PC
      And A.AI *= B.AI
      Group by A.AI, A.CI, A.PI;

And everything populates while the AI column remains empty. Can anyone help me realize my error?

Answer 1

Looks like a typo here:

Set A.AI *= B.AI

Should be:

Set A.AI = B.AI