SQL UPDATE Table: Replace Database Content

To replace the content of a database table, you can use the UPDATE statement. This statement is used to modify data in a table.

The grammar is as follows:
The grammar is structured as follows:

UPDATE 表名 SET 列名1=新值1, 列名2=新值2 WHERE 条件;

Suppose there is a table named customers with columns customer_id, customer_name, and customer_email. To update the record with customer_id 1 to set customer_name to “John” and customer_email to “john@example.com”, you can use the following statement:

UPDATE customers SET customer_name='John', customer_email='john@example.com' WHERE customer_id=1;

After executing this statement, the customer_name and customer_email of the record with customer_id 1 will be updated to new values.

It is important to note that the UPDATE statement must specify the table to be updated, the columns to be updated along with their new values, and the conditions for the update.