How to use update command with case statement in oracle?

@aubrey 

The UPDATE command in Oracle is used to modify existing records in a table. When using a CASE statement within an UPDATE command, you can specify different conditions and values to update based on those conditions.

Here is an example of how to use an UPDATE command with a CASE statement in Oracle:

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UPDATE your_table
SET column_name = 
   CASE
      WHEN condition1 THEN value1
      WHEN condition2 THEN value2
      ...
      ELSE default_value
   END
WHERE your_condition;

In this syntax:

• your_table: the table you want to update
• column_name: the column you want to update
• condition1, condition2, etc.: the conditions to check for updating the column
• value1, value2, etc.: the values to set when the corresponding condition is true
• default_value: the default value to set if none of the conditions are met
• your_condition: additional condition to filter the rows that will be updated

You can include multiple WHEN clauses with different conditions and values based on your requirements. Just make sure to specify a default value in the ELSE clause to cover any cases that are not specifically handled.

After executing the UPDATE command with the CASE statement, the specified column in the table will be updated based on the conditions and values provided.