But, we only want to use the customers that actually have had a purchase.
Let us start simple, and pretend that the department with id # 20, “Marketing” is from now on going to be named “Customer Relations”.
But, at the same time they were going to be under management of manager id # 205.
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You can also perform more complicated updates in Oracle.
You may wish to update records in one table based on values in another table.Let’s create a table: UPDATE customer_order_total cot SET cot.postal_code = ( SELECT c.cust_address.postal_code FROM oe.customers c WHERE c.customer_id = cot.customer_id ), cot.country_code = ( SELECT c.cust_address.country_id FROM oe.customers c WHERE c.customer_id = cot.customer_id ) ; UPDATE customer_order_total cot SET ( cot.postal_code, cot.country_code ) = ( SELECT c.cust_address.postal_code, c.cust_address.country_id FROM oe.customers c WHERE c.customer_id = cot.customer_id ) ; In the update statement above, you need to make sure that you specify the (in this case) the unique identifier in the customer table that matches the customer id in our customer_order_total table.Actually, if you mess up on the WHERE line in the last query, you will end up getting the following error message: “ TJ Abrahamsen is the founder and author of Oracle Coder. His expertise is with Oracle SQL, PL/SQL, and the latest years Java against Oracle databases.I already know how to update multiple rows using my where clause, but I don't see how to update multiple columns.What is the SQL update syntax to update more than one column?Answer: The landmark book "Advanced Oracle SQL Tuning The Definitive Reference" is filled with valuable information on Oracle SQL Tuning.