Question

In my mysql db i’ve 2 table with same field in both.

I need to update all the records in table2 where table1 had the same id_customer and the fields are not empty.

Example:

table1

id|name|surname|id_customer|email

1|jon|jack|12|[e-mail]

table2

id_customer|name|surname|email

12| |jack|[e-mail]

The query have to update table2 adding “jon” on name

Any idea how to?

Thank you

Answer 1

Try this one –

UPDATE table1 t1
  JOIN table2 t2
    ON t1.customer_id = t2.customer_id
SET
  t2.name = IF(t2.name IS NULL OR t2.name = '', t1.name, t2.name),
  t2.email = IF(t2.email IS NULL OR t2.email = '', t1.email, t2.email),
  t2.sur_name = IF(t2.sur_name IS NULL OR t2.sur_name = '', t1.sur_name, t2.sur_name);