How to replace string in oracle

The method of replacing strings in Oracle is to use the REPLACE function. The syntax of this function is: REPLACE(string, search_string, replace_string). Usage steps: 1. Identify the substring to be replaced; 2. Determine the new string to replace the substring; 3. Use the REPLACE function to replace. Advanced usage includes: multiple replacements, case sensitivity, special character replacement, etc.

How to replace strings in Oracle

In Oracle, you can use REPLACE Function to replace substrings in a string. The syntax of this function is as follows:

<code class="sql">REPLACE(string, search_string, replace_string)</code>

Among them:

• string: The string that needs to be replaced.
• search_string: The substring to find and replace.
• replace_string: Substring used to replace search_string.

Usage:

To replace a substring in a string, use the following steps:

1. Identify that you want to replace substring.
2. Determine the new string that replaces the substring.
3. Use the REPLACE function for replacement.

Example:

Replace the substring "Original" in the string "Original String" to "New":

<code class="sql">SELECT REPLACE('Original String', 'Original', 'New') FROM dual;</code>

Output:

<code>New String</code>

Advanced usage:

Multiple replacements:

Using the REPLACE function can Make multiple substitutions. For example, to replace all "a"s in a string with "A", you would use the following syntax:

<code class="sql">SELECT REPLACE(REPLACE('This is a string', 'a', 'A'), 'a', 'A') FROM dual;</code>

Output:

<code>This is A string</code>

Case sensitive:

By default, the REPLACE function is case-sensitive. To make a case-insensitive substitution, use the UPPER or LOWER function to convert a string to uppercase or lowercase.

Special characters:

To replace special characters (such as %, _), please use search_string and replace_string Use the escape character (\). For example, to replace all newline characters (\n) in a string with spaces, you would use the following syntax:

<code class="sql">SELECT REPLACE('This\nis\na string', '\n', ' ') FROM dual;</code>

Output:

<code>This is a string</code>

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