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insert into reader(cardid,address)
values (‘uuu‘,‘luna‘,address)
values (‘vvv‘,‘B‘,‘harry‘,address)
values (‘www‘,‘C‘,‘chander‘,‘2‘,‘professor‘,address)
values (‘yyy‘,‘joey‘,address)
values (‘zzz‘,‘richard‘,address)
values (‘OOO‘,‘micheal‘,address)
values (‘ppp‘,‘richal‘,address)
values (‘abp‘,‘michal‘,address)
values (‘ccp‘,‘mike‘,‘bupt‘);
--插入数据-borrow
insert into borrow(cardid,bookid,borrowdate) values(‘xxx‘,‘aaa‘,‘2014-4-29‘);
insert into borrow(cardid,‘bbb‘,‘ccc‘,‘2014-4-28‘);
insert into borrow(cardid,borrowdate) values(‘yyy‘,‘ddd‘,‘2014-4-27‘);
insert into borrow(cardid,borrowdate) values(‘zzz‘,borrowdate) values(‘uuu‘,‘2014-4-26‘);
insert into borrow(cardid,borrowdate) values(‘vvv‘,borrowdate) values(‘www‘,‘2014-4-26‘);
表信息如下：
book------> reader-------> borrow
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3. 查询A单位借阅图书的读者人数和人员详细信息
人数：
with vt1 as
(select cardid from reader where reader.org=‘A‘)
select count(1) from vt1 where exists (select cardid from borrow where borrow.cardid=vt1.cardid);
详细信息：
with vt1 as
(select cardid,org from reader where reader.org=‘A‘)
select cardid,org from vt1 where exists (select cardid from borrow where borrow.cardid=vt1.cardid);
4.查询借书证号尾字符为‘p‘的读者
select cardid,org from reader where cardid like ‘%p‘;
5.?查询名字以m开头的女性读者，‘1’显示为女，‘2’显示为男
select cardid,
case when gender=‘1‘ then ‘女‘ when gender=‘2‘ then ‘男‘ else ‘其他‘ end gender
from reader where name like ‘m%‘;
6.?2014年2-4月借过书的读者
1)查询满足条件的读者（仅包含cardid）--未去重
方式一：
select cardid,borrowdate from borrow where to_char(to_date(borrowdate,‘yyyy-mm-dd‘),‘yyyy‘)=‘2014‘
and to_char(to_date(borrowdate,‘mm‘)>=‘02‘
and to_char(to_date(borrowdate,‘mm‘)<=‘04‘;
方式二：
select cardid,‘yyyy‘)=‘2014‘ --查询
and to_char(to_date(borrowdate,‘yyyy-mm‘)>=‘2014-02‘
and to_char(to_date(borrowdate,‘yyyy-mm‘)<=‘2014-04‘;
方式三：
select cardid,‘yyyy-mm-dd hh24:mi:ss‘);
2) 查询+去重
select distinct cardid from borrow where to_char(to_date(borrowdate,‘yyyy‘)=‘2014‘ --查询+去重
and to_char(to_date(borrowdate,‘yyyy-mm‘)<=‘2014-04‘;
select distinct cardid from borrow where to_date(borrowdate,‘yyyy-mm-dd hh24:mi:ss‘);
3）查询+去重+读者姓名等信息
with vt1 as (select distinct cardid from borrow where to_char(to_date(borrowdate,‘yyyy‘)=‘2014‘ and to_char(to_date(borrowdate,‘yyyy-mm‘)>=‘2014-02‘and to_char(to_date(borrowdate,‘yyyy-mm‘)<=‘2014-04‘)select cardid,org from reader where exists (select cardid from vt1 where vt1.cardid=reader.cardid);
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