CHARACTER BUILT IN FUNCTIONS

UPPER()

UPPER('john') = JOHN

LOWER()

LOWER('John')=john

INITCAP

SELECT INITCAP(firstname), INITCAP(lastname)
 FROM customers
  WHERE LOWER(lastname) 

LENGTH()

LENGTH('JOHN')=4

SUBSTR()

RETURNS PART OF A STRING. START FROM THE 2ND POSITION AND RETURN 3 CHARACHTERS

SUBSTR('JAMES',2,3)=AME

DECODE()

RETURNS THE VALUE MATCHING THE CONDITION TAKE THE 20 IN THE FRONT AND RETURN THE CORRESPONDING STRING

DECODE(20,10,'TEN',20,'TWENTY',30,'THIRTY') = TWENTY

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