[16진수 -> 2진수 로 변환] SELECT REPLACE(MAX (SYS_CONNECT_BY_PATH(bit, ',')), ',') bin FROM ( SELECT COUNT (*) OVER () - LEVEL + 1 level# , DECODE (TRUNC (deci / POWER (2, LEVEL)),ROUND (deci / POWER (2, LEVEL)), 0,1) bit FROM ( SELECT 2911 deci FROM DUAL ) CONNECT BY POWER (2, LEVEL - 1)