Oracle provides the UPDATE() function and a series of other column update functions, including NVL(), COALESCE(), GREATEST() and LEAST(), for updating one column to the value of another column. First determine the column to be updated, then find the column from which the updated value is to be obtained, and finally write the UPDATE() function to update the column.
Column update functions in Oracle
Oracle provides a series of functions that can easily update a column to the value of another column. The most commonly used function is the UPDATE() function.
UPDATE() function
UPDATE() function has the following syntax:
<code>UPDATE(expression, target_column, source_column)</code>
where:
How to use
To use the UPDATE() function, please follow these steps:
Example
For example, suppose we have a table called "customers" that contains the "name" and "age" columns. To update the "name" column to the value of the "first_name" column, you can use the following query:
<code>UPDATE customers SET name = first_name;</code>
Now, the "name" column will contain the value from the "first_name" column.
Other column update functions
In addition to the UPDATE() function, Oracle also provides other column update functions, including:
Choosing which function to use depends on specific requirements.
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