SQL

get first 3 letter of department name in sql

SELECT FIRST_NAME ,  SUBSTR(FIRST_NAME, 1 , 3 ) , LENGTH(FIRST_NAME)
FROM EMPLOYEES ; 

get first 3 letters in sql

-- substr(string, start, [, length ])
SELECT substr('Hello World', 1, 3) ;      -- Hel
SELECT substr('Hello World', 4, 5) ;      -- lo Wo
SELECT substr('Hello World', 4);          -- lo World
SELECT substr('Hello World', -3);         -- rld