Oracle UPDATE SELECT Explained

In Oracle, the UPDATE SELECT statement is used to update data in a table based on the result set of a SELECT statement. This syntax allows for selecting data from one table based on certain conditions and updating it in another table, which is very flexible and convenient.

For example, here is an example of an UPDATE SELECT statement:

UPDATE table1
SET column1 = table2.column2
FROM table1
JOIN table2 ON table1.id = table2.id
WHERE table2.column3 = 'value';

This statement will select data from table2 based on conditions and update it into table1. The UPDATE SELECT statement allows for data to be selected from one table and updated into another table as needed, enabling flexible data updating.