學習總結(兩種寫法):
–1.先查到所有信息的結果集並命名爲A,
–2.然後查詢rownum<=10的所有信息,和rownum並且重命名爲rn
–3.查詢rn<=5
select * from (select A.*,rownum rn from (select * from emp)A where rownum<=10) where rn>=5
–1.先查到所有信息的結果集並命名爲A,
–2.然後在A裏面查詢A裏面的所有信息(A.)查詢A.的同時查詢rownum重命名爲rn,,
–3.查詢rn>=4 and rn<=10
select * from (select A.* ,rownum rn from(select * from emp)A) where rn>=4 and rn<=10;