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FIND_IDX

The FIND_IDX function in SQL is used to return the position of the first occurrence of a substring in a string, optionally after a specified position.

Syntax

The syntax for the FIND_IDX function in SQL is:

FIND_IDX ( string, substring, [ start_position ] )

Parameters

  • string: The string where the search will take place.
  • substring: The substring to find.
  • start_position (optional): The position at which to start the search. The first position in the string is 0. If the start_position is not specified, the search starts from the beginning of the string.

Examples

Let's consider a few examples to understand how to use the FIND_IDX function.

Find the position of 'rg' in 'pork':

SELECT FIND_IDX('pork', 'rg') AS test;

This will return 0, as 'rg' is not found in 'pork'.

Find the position of 'rg' in 'burger':

SELECT FIND_IDX('burger', 'rg') AS test;

This will return 3, as the first occurrence of 'rg' in 'burger' is at position 3.

Find the position of 'r' in 'pork', starting from position 4:

SELECT FIND_IDX('pork', 'r', 4) AS test;

This will return 0, as 'r' is not found in 'pork' after position 4.

Find the position of 'r' in 'burger', starting from position 4:

SELECT FIND_IDX('burger', 'r', 4) AS test;

This will return 6, as the first occurrence of 'r' in 'burger' after position 4 is at position 6.

Find the position of an empty string in 'cheese':

SELECT FIND_IDX('cheese', '') AS test;

This will return 0, because the search starts at the first position by default and the empty string is considered to be found at the start of any string.

Find the position of 's' in 'cheese':

SELECT FIND_IDX('cheese', 's') AS test;

This will return 5, as the first occurrence of 's' in 'cheese' is at position 5.

Find the position of 'e' in 'cheese burger', starting from position 5:

SELECT FIND_IDX('cheese burger', 'e', 5) AS test;

This will return 6, because the search starts from position 5 and the next 'e' is at position 6.

Using a NULL value as the substring will return NULL:

SELECT FIND_IDX('cheese', NULL) AS test;