What is the method for batch data operations in Update?

In the database, bulk data operations can be achieved through several methods.

1. By using the UPDATE statement, you can write a single UPDATE statement to update multiple pieces of data. You can use the WHERE clause to restrict the conditions for updating, updating multiple rows that meet the criteria.
2. The “INSERT INTO … ON DUPLICATE KEY UPDATE” statement can be used to update data in bulk if a unique index or primary key exists in a database table. This statement attempts to insert new rows of data, and if it encounters a duplicate unique index or primary key, it will perform an update instead.
3. You can perform batch data updates in an UPDATE statement using the CASE statement. This allows you to select the value to update based on certain conditions, updating different values depending on the conditions.
4. By using a temporary table, you can import the data that needs to be updated into the temporary table, and then use an UPDATE statement to update the data from the temporary table to the target table.

The appropriate method for batch data updates should be selected based on the specific situation.