How to handle special characters in Oracle?

In Oracle database, if you need to work with special characters, you can use the following methods:

1. Escape characters: Using a backslash (\) as an escape character to convert special characters into regular characters. For example, to handle double quotation marks (“), you can use \” to escape them.

SELECT 'This is a "quoted" string' FROM dual;

1. Quote identifiers: In Oracle, you can use double quotes (“) to enclose identifiers in order to handle identifiers that contain special characters. For example, if you want to work with column names that contain spaces, you can use double quote identifiers.

SELECT "column name with space" FROM table_name;

1. Utilize escape functions: Oracle offers built-in string functions to handle special characters. For instance, use the REPLACE function to substitute special characters.

SELECT REPLACE(column_name, '&', 'and') FROM table_name;

1. Regular expressions: Using regular expressions functions allows for more intricate handling of special characters. For example, using the REGEXP_REPLACE function to replace special characters.

SELECT REGEXP_REPLACE(column_name, '[^a-zA-Z0-9]', '') FROM table_name;

The appropriate course of action should be chosen based on the specific circumstances.