How does Oracle extract a specific portion of a string?

In Oracle, you can utilize the SUBSTR function to extract a specific portion of a string.

The grammar is as follows:
The syntax is as follows:

Retrieve a portion of a string starting from a specific position for a specified length.

In this case, string is the string to be extracted, start_position is the starting position of the extraction (counting from 1), and length is the length to be extracted.

For example, if you have a string “Hello World” and you want to extract the substring “World” from it, you can use the following statement:

Get a substring of ‘Hello World’ starting from index 7 with a length of 5 characters.

This will return the string “World”.

If you are unsure of the length of the substring to be extracted, you can use the following statement:

Get the substring of ‘Hello World’ starting from the 7th character.

This will return all characters starting from the 7th character, which is the string “World”.

It is worth noting that string indexes in Oracle start counting from 1.