greatest and least [Oracle SQL]

greatest (expr-1)
greatest (expr-1, expr_2)
greatest (expr-1, expr_2, ..., expr-n)

least (expr-1)
least (expr-1, expr_2)
least (expr-1, expr_2, ..., expr-n)

select least(44, 22, 49, 8, 102) from dual;

8

select greatest(44, 22, 49, 8, 102) from dual;

102