How to Split a String in Oracle SQL by the Furthest Delimiter?

Split String by Delimiter Position Using Oracle SQL

In database environments, working with string data is essential. The ability to split a string by a delimiter at a specific position is often required for data manipulation and analysis. This question demonstrates how to overcome the challenge of splitting a string in Oracle SQL by determining the furthest delimiter.

The example provided in the question involves separating the string "F/P/O" into its components, and the desired result is "F/P" and "O." The problem arises when the string does not consistently follow the same delimiter pattern, as the provided SQL code produces unexpected results for strings with only one delimiter.

To resolve this issue, the provided SQL code needs to be modified slightly. The key is to identify the furthest delimiter from the end of the string. This can be achieved by using the INSTR function, which takes a negative starting position.

Below is the revised SQL code that successfully splits the string by the furthest delimiter:

WITH DATA AS
(
SELECT 'F/P/O' str FROM dual
)
SELECT 
SUBSTR(str, 1, Instr(str, '/', -1, 1) -1) part1,
SUBSTR(str, Instr(str, '/', -1, 1) +1) part2
FROM DATA

In this improved code, the INSTR function is called with a negative starting position of -1 and a search pattern of '/'. This ensures that the function starts searching from the end of the string, identifying the furthest delimiter. The resulting split is accurate for both strings with multiple delimiters and those with only one delimiter, as desired.

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