Subtr Oracle ?
/*Using SUBSTR in Oracle (Example from hackerrank.com): */
/*Simple select query...*/
SELECT DISTINCT city
FROM station
/*Using WHERE and SUBSTR to find (distinct) cities in station table that begin
as well as end with a vowel.*/
WHERE SUBSTR(city,1,1) IN ('A','E','I','O','U')
AND substr(city,-1) IN ('a','e','i','o','u');
/*Parameters for SUBSTR (Substring) in order are as follows:
String, Start, Length.*/