How to see the number of occurrences of a certain character in Oracle

To find the number of occurrences of a character in Oracle, perform the following steps: Get the total length of the string; Get the length of the substring where the character is located; Calculate the number of occurrences of a character: Subtract the substring from the total length length.

Find the number of times a character appears in Oracle

To find the number of times a character appears in Oracle, you can use LENGTH() and SUBSTR() functions. Here are the steps:

1. Use the LENGTH() function to get the total length of the string:

   <code class="sql">SELECT LENGTH('your_string') FROM your_table;</code>

2. Use the SUBSTR() function to get the length of the substring where the character is located:

   <code class="sql">SELECT LENGTH(SUBSTR('your_string', start_position, end_position)) FROM your_table;</code>

   Among them:

   • start_position is the starting position of the character to look for.
   • end_position is the end position of the character to look for.

3. Calculate the number of occurrences of a character:
   Subtract the total length of the string obtained in step 1 from the total length obtained in step 2 Substring length.

   <code class="sql">SELECT LENGTH('your_string') - LENGTH(SUBSTR('your_string', start_position, end_position)) FROM your_table;</code>

Example:

Find the number of occurrences of the character "o" in the string "Hello World":

<code class="sql">SELECT LENGTH('Hello World') - LENGTH(SUBSTR('Hello World', 2, 1)) FROM dual;</code>

Result: 2

Notes:

• If the character is not in the string, the result will be 0.
• If you want to find multiple characters, you can use the REPLACE() function to replace all other characters first, then use the above steps.

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