Update data to upper case in parent/child tables

Question

Hi Gurus!
In production we have a product table and which is being reference by many tables making it parent child relationship. By mistake, we realized that last month some product were added in lower case and now we got a request to update all these product codes to upper case so that the existing code that use these tables have no impact. Appreciate if you can give some idea on how can I update the existing data in the parent table to upper case along with the child records?
Regards
Sri

Answer 1

Are the product code that you need to update what is stored in the child tables? If so, then you would need to do it in several steps, something like:
Identify the child tables
SELECT table_name, constraint_name
FROM user_constraints
WHERE r_constraint_name = (SELECT constraint_name
                           FROM user_constraints
                           WHERE table_name = 'PRODUCT_TABLE' and
                                 constraint_type = 'P');Create the new upper case product code in product table:
INSERT INTO product_table
SELECT UPPER(product_code), other_columns
FROM product_table
WHERE product_code <> UPPER(product_code);Update the child tables to uppercase the product codes
UPDATE child1
SET product_code = UPPER(product_code)
WHERE product_code <> UPPER(product_code);finally, delete the lower case product codes from product_table
DELETE FROM product_table
WHERE product_code <> UPPER(product_code);John