DECLARE	v_day		VARCHAR2(2);	v_month		VARCHAR2(2);	v_sqlStr	VARCHAR2(900);	BEGIN	v_day    := to_char(sysdate-1,'fmdd');	v_month  := to_char(sysdate,'fmmm');	DBMS_OUTPUT.PUT_LINE(v_day);	v_sqlStr := 'insert into fy_month_'||v_month||'(	select login_name,trunc(sysdate-1,''fmdd''),lab_ip,sum(time_duration) from fy_day_'||v_day||'		where logout_date >= trunc(sysdate-1,''fmdd'')		and logout_date < trunc(sysdate,''fmdd'')		group by login_name,lab_ip)';EXECUTE IMMEDIATE v_sqlStr;END;