How Can I Split a String in Oracle SQL Based on the Furthest Delimiter's Position?

Splitting Strings by Delimiter Position in Oracle SQL

The INSTR function in Oracle SQL empowers you to split strings based on specific positions of delimiters. This is particularly useful when you need to extract specific parts of a string. For instance, consider a string "F/P/O." If you aim to split this string at the furthest delimiter, the expected result is "F/P" and "O."

To achieve this using Oracle SQL, you can leverage the following statement:

SELECT
  SUBSTR(str, 1, INSTR(str, '/', -1, 1) - 1) AS part1,
  SUBSTR(str, INSTR(str, '/', -1, 1) + 1) AS part2
FROM data

This statement utilizes the negative start_position in INSTR to count back from the end of the string, locating the furthest delimiter. The SUBSTR function is then employed to extract the substrings before and after the delimiter.

Addressing Unexpected Results

In your initial query, the unexpected result may have occurred because you potentially omitted the start_position in the INSTR call. Adjusting the start_position to a negative value will ensure that the function searches from the end of the string for the farthest delimiter.

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