Update the data to uppercase in the parent/child tables

Hi gurus!

In production, we have a table product and that is in reference by many tables making parent child relationship. By mistake, we realized last month some products have been added to lowercase and now we have a request to update all these product codes uppercase so that existing code that use these tables have no impact. Appreciate if you can give an idea about how can I update the existing data in the table parent uppercase as well as child records?

Concerning
Sri

Are the product code that you need to update what is stored in the tables of children? If Yes, then you must 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 new product of upper-case code in the product table:

INSERT INTO product_table
SELECT UPPER(product_code), other_columns
FROM product_table
WHERE product_code <> UPPER(product_code);

Update the children tables for caps product codes

UPDATE child1
SET product_code = UPPER(product_code)
WHERE product_code <> UPPER(product_code);

Finally, remove the tiny product_table product codes

DELETE FROM product_table
WHERE product_code <> UPPER(product_code);

John

Tags: Database

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