How to use replace function in oracle

The REPLACE function in Oracle is used to replace a specified substring in a string with another substring. Methods of use include: 1. Replace errors or spelling errors in the text; 2. Change the string Content; 3. Remove a specific substring from a string.

Usage of REPLACE function in Oracle

The REPLACE function is used to replace the specified substring in a string for another substring. Its syntax format is as follows:

<code>REPLACE(string, old_string, new_string)</code>

Among them:

• string: The string that needs to be replaced.
• old_string: The substring that needs to be replaced.
• new_string: Replace old_string with a new substring.

Usage:

The REPLACE function can be used for the following purposes:

• Replace errors or spelling errors in text.
• Replace one substring with another substring to change the content of the string.
• Remove a specific substring from a string.

Example:

The following example replaces "World" in the string with "Universe":

<code class="sql">SELECT REPLACE('Hello World', 'World', 'Universe') FROM dual;</code>

Output:

<code>Hello Universe</code>

Note:

• The REPLACE function is case-sensitive, so "World" and "world" will be treated as different substrings.
• If old_string appears multiple times in string, all matches will be replaced.
• If old_string is not in string, string will remain unchanged.
• If new_string is an empty string, old_string will be removed from string.

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