I converted that from:
CREATE OR REPLACE VIEW Step45_Flap1 AS
SELECT time_stamp FROM ( SELECT time_stamp FROM(
SELECT time_stamp FROM (SELECT time_stamp' ||query1||' FROM '||Param5||' GROUP BY time_stamp ORDER BY time_stamp DESC) WHERE time_stamp '||Param4||' TO_DATE('''||Param3||''',''MM/DD/YYYY HH24:MI

S'') AND ROWNUM<='||Param6||')
ORDER BY time_stamp ASC) WHERE ROWNUM<='||Param7;