Release of updated with the value of the other Table

Hello
I need the sum there point TableB and insert/update this value in the X field in TableA. I can do this with select statements regular when I add values in my statement, but I'm getting errors now. Need help on how to code the trigger to do this, thank you.
ORA-00936: lack of expression
SELECT a.X, SUM(b.Y), 
INTO a.X
FROM TableA a, TableB b
WHERE a.PK = b.FK;

Ok. I think I understand now what's going on. Think logically that you create the customer first and only then customer can create orders, right? So when you insert a customer into the table DEMO_CUSTOMERS there is no customer order in the DEMO_ORDERS table. As a result, the CREDIT_LIMIT column remains NULL.

SY.

Tags: Database

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