Major Description
SUBSTRING_INDEX(str,delim,count)
Returns the substring from string str before count occurrences of the delimiter delim. If count is positive, everything to the left of the final delimiter (counting from the left) is returned. If count is negative, everything to the right of the final delimiter (counting from the right) is returned. SUBSTRING_INDEX() performs a case-sensitive match when searching for delim.
Examples:
SELECT SUBSTRING_INDEX('www.mysql.com', '.', 3); --www.mysql.com SELECT SUBSTRING_INDEX('www.mysql.com', '.', 2); --www.mysql SELECT SUBSTRING_INDEX('www.mysql.com', '.', 1); --www SELECT SUBSTRING_INDEX('www.mysql.com', '.', 0); --'' SELECT SUBSTRING_INDEX('www.mysql.com', '.', -1); --com SELECT SUBSTRING_INDEX('www.mysql.com', '.', -2); --mysql.com SELECT SUBSTRING_INDEX('www.mysql.com', '.', -3); --www.mysql.com
--#delim does not exist in str SELECT SUBSTRING_INDEX('www.mysql.com', 'Q', 1); --www.mysql.com --#delim is 2 chars SELECT SUBSTRING_INDEX('www||mysql||com', '||', 2); --www||mysql --#delim is empty string SELECT SUBSTRING_INDEX('www.mysql.com', '', 2); --'' --#str is empty string SELECT SUBSTRING_INDEX('', '.', 2); --''
--#null params SELECT SUBSTRING_INDEX(null, '.', 1); --null SELECT SUBSTRING_INDEX('www.mysql.com', null, 1); --null SELECT SUBSTRING_INDEX('www.mysql.com', '.', null); --null
