時:分:秒
SELECT to_char(sysdate,'HH24') || ':' || to_char(sysdate,'MI') || ':' || to_char(sysdate,'SS') time FROM dual
時:分:秒
SELECT to_char(sysdate,'HH24') || ':' || to_char(sysdate,'MI') || ':' || to_char(sysdate,'SS') time FROM dual
SELECT * FROM tableName WHERE column1 IS NULL
SELECT * FROM tableName WHERE ROWNUM <= n