MySQL50道题
数据表介绍
–1.学生表
Student(SId,Sname,Sage,Ssex)
–SId 学生编号,Sname 学生姓名,Sage 出生年月,Ssex 学生性别
–2.课程表
Course(CId,Cname,TId)
–CId 课程编号,Cname 课程名称,TId 教师编号
–3.教师表
Teacher(TId,Tname)
–TId 教师编号,Tname 教师姓名
–4.成绩表
SC(SId,CId,score)
–SId 学生编号,CId 课程编号,score 分数
学生表 Student
create table Student(SId varchar(10),Sname varchar(10),Sage datetime,Ssex varchar(10));
insert into Student values(‘01’ , ‘赵雷’ , ‘1990-01-01’ , ‘男’);
insert into Student values(‘02’ , ‘钱电’ , ‘1990-12-21’ , ‘男’);
insert into Student values(‘03’ , ‘孙风’ , ‘1990-12-20’ , ‘男’);
insert into Student values(‘04’ , ‘李云’ , ‘1990-12-06’ , ‘男’);
insert into Student values(‘05’ , ‘周梅’ , ‘1991-12-01’ , ‘女’);
insert into Student values(‘06’ , ‘吴兰’ , ‘1992-01-01’ , ‘女’);
insert into Student values(‘07’ , ‘郑竹’ , ‘1989-01-01’ , ‘女’);
insert into Student values(‘09’ , ‘张三’ , ‘2017-12-20’ , ‘女’);
insert into Student values(‘10’ , ‘李四’ , ‘2017-12-25’ , ‘女’);
insert into Student values(‘11’ , ‘李四’ , ‘2012-06-06’ , ‘女’);
insert into Student values(‘12’ , ‘赵六’ , ‘2013-06-13’ , ‘女’);
insert into Student values(‘13’ , ‘孙七’ , ‘2014-06-01’ , ‘女’);
科目表 Course
create table Course(CId varchar(10),Cname nvarchar(10),TId varchar(10));
insert into Course values(‘01’ , ‘语文’ , ‘02’);
insert into Course values(‘02’ , ‘数学’ , ‘01’);
insert into Course values(‘03’ , ‘英语’ , ‘03’);
教师表 Teacher
create table Teacher(TId varchar(10),Tname varchar(10));
insert into Teacher values(‘01’ , ‘张三’);
insert into Teacher values(‘02’ , ‘李四’);
insert into Teacher values(‘03’ , ‘王五’);
成绩表 SC
create table SC(SId varchar(10),CId varchar(10),score decimal(18,1));
insert into SC values(‘01’ , ‘01’ , 80);
insert into SC values(‘01’ , ‘02’ , 90);
insert into SC values(‘01’ , ‘03’ , 99);
insert into SC values(‘02’ , ‘01’ , 70);
insert into SC values(‘02’ , ‘02’ , 60);
insert into SC values(‘02’ , ‘03’ , 80);
insert into SC values(‘03’ , ‘01’ , 80);
insert into SC values(‘03’ , ‘02’ , 80);
insert into SC values(‘03’ , ‘03’ , 80);
insert into SC values(‘04’ , ‘01’ , 50);
insert into SC values(‘04’ , ‘02’ , 30);
insert into SC values(‘04’ , ‘03’ , 20);
insert into SC values(‘05’ , ‘01’ , 76);
insert into SC values(‘05’ , ‘02’ , 87);
insert into SC values(‘06’ , ‘01’ , 31);
insert into SC values(‘06’ , ‘03’ , 34);
insert into SC values(‘07’ , ‘02’ , 89);
insert into SC values(‘07’ , ‘03’ , 98);
- 查询" 01 “课程比” 02 "课程成绩高的学生的信息及课程分数
select s.*, a.score as score_01, b.score as score_02
from student s,
(select sid, score from sc where cid=01) a,
(select sid, score from sc where cid=02) b
where a.sid = b.sid and a.score > b.score and s.sid = a.sid
+------+--------+---------------------+------+----------+----------+
| Sid | Sname | Sage | Ssex | score_01 | score_02 |
+------+--------+---------------------+------+----------+----------+
| 02 | 钱电 | 1990-12-21 00:00:00 | 男 | 70.0 | 60.0 |
| 04 | 李云 | 1990-08-06 00:00:00 | 男 | 50.0 | 30.0 |
+------+--------+---------------------+------+----------+----------+
2 rows in set (0.00 sec)- 查询平均成绩大于等于 60 分的同学的学生编号和学生姓名和平均成绩
select s.sid, sname, avg(score) as avg_score
from student as s, sc
where s.sid = sc.sid
group by s.sid
having avg_score > 60
+------+--------+-----------+
| sid | sname | avg_score |
+------+--------+-----------+
| 01 | 赵雷 | 89.66667 |
| 02 | 钱电 | 70.00000 |
| 03 | 孙风 | 80.00000 |
| 05 | 周梅 | 81.50000 |
| 07 | 郑竹 | 93.50000 |
+------+--------+-----------+
5 rows in set (0.00 sec)- 查询在 SC 表存在成绩的学生信息
select * from student where sid in (select sid from sc where score is not null)
+------+--------+---------------------+------+
| Sid | Sname | Sage | Ssex |
+------+--------+---------------------+------+
| 01 | 赵雷 | 1990-01-01 00:00:00 | 男 |
| 02 | 钱电 | 1990-12-21 00:00:00 | 男 |
| 03 | 孙风 | 1990-05-20 00:00:00 | 男 |
| 04 | 李云 | 1990-08-06 00:00:00 | 男 |
| 05 | 周梅 | 1991-12-01 00:00:00 | 女 |
| 06 | 吴兰 | 1992-03-01 00:00:00 | 女 |
| 07 | 郑竹 | 1989-07-01 00:00:00 | 女 |
+------+--------+---------------------+------+
7 rows in set (0.00 sec)- 查询所有同学的学生编号、学生姓名、选课总数、所有课程的总成绩(没成绩的显示为 null )
select s.sid, s.sname, count(cid) as 选课总数, sum(score) as 总成绩
from student as s left join sc
on s.sid = sc.sid
group by s.sid
| sid | sname | 选课总数 | 总成绩 |
+------+--------+--------------+-----------+
| 01 | 赵雷 | 3 | 269.0 |
| 02 | 钱电 | 3 | 210.0 |
| 03 | 孙风 | 3 | 240.0 |
| 04 | 李云 | 3 | 100.0 |
| 05 | 周梅 | 2 | 163.0 |
| 06 | 吴兰 | 2 | 65.0 |
| 07 | 郑竹 | 2 | 187.0 |
| 08 | 王菊 | 0 | NULL |
+------+--------+--------------+-----------+
8 rows in set (0.00 sec)
c
在这里插入代码片- 查询「李」姓老师的数量
select count(tname) from teacher where tname like ‘李%’ - 查询学过「张三」老师授课的同学的信息
+--------------+
| count(tname) |
+--------------+
| 1 |
+--------------+
1 row in set (0.00 sec)- 查询没有学全所有课程的同学的信息
select * from student where sid in (select sid from sc group by sid having count(cid) < 3)
+------+--------+---------------------+------+
| Sid | Sname | Sage | Ssex |
+------+--------+---------------------+------+
| 05 | 周梅 | 1991-12-01 00:00:00 | 女 |
| 06 | 吴兰 | 1992-03-01 00:00:00 | 女 |
| 07 | 郑竹 | 1989-07-01 00:00:00 | 女 |
+------+--------+---------------------+------+
3 rows in set (0.00 sec)- 查询至少有一门课与学号为" 01 "的同学所学相同的同学的信
select * from Student
where Sid in(
select Sid from SC
where Cid in (select Cid from SC where Sid = ‘01’) and Sid <>‘01’
group by Sid
having COUNT(Cid)>=3
)
+------+--------+---------------------+------+
| Sid | Sname | Sage | Ssex |
+------+--------+---------------------+------+
| 02 | 钱电 | 1990-12-21 00:00:00 | 男 |
| 03 | 孙风 | 1990-05-20 00:00:00 | 男 |
| 04 | 李云 | 1990-08-06 00:00:00 | 男 |
+------+--------+---------------------+------+
3 rows in set (0.00 sec)- 查询和" 01 "号的同学学习的课程 完全相同的其他同学的信息
select * from Student
where Sid in(
select Sid from SC
where Cid in (select Cid from SC where Sid = ‘01’) and Sid <>‘01’
group by Sid
having COUNT(Cid)>=3
)
| Sid | Sname | Sage | Ssex |
+------+--------+---------------------+------+
| 02 | 钱电 | 1990-12-21 00:00:00 | 男 |
| 03 | 孙风 | 1990-05-20 00:00:00 | 男 |
| 04 | 李云 | 1990-08-06 00:00:00 | 男 |
+------+--------+---------------------+------+
3 rows in set (0.00 sec)
在这里插入代码片- 查询没学过"张三"老师讲授的任一门课程的学生姓名
select sname from student
where sname not in (
select s.sname
from student as s, course as c, teacher as t, sc
where s.sid = sc.sid
and sc.cid = c.cid
and c.tid = t.tid
and t.tname = ‘张三’
)
+--------+
| sname |
+--------+
| 吴兰 |
| 王菊 |
+--------+
2 rows in set (0.00 sec)- 查询两门及其以上不及格课程的同学的学号，姓名及其平均成绩
select s.sid, s.sname, avg(score)
from student as s, sc
where s.sid = sc.sid and score<60
group by s.sid
having count(score)>=2
+------+--------+------------+
| sid | sname | avg(score) |
+------+--------+------------+
| 04 | 李云 | 33.33333 |
| 06 | 吴兰 | 32.50000 |
+------+--------+------------+
2 rows in set (0.00 sec)- 检索" 01 "课程分数小于 60，按分数降序排列的学生信息
select s.* ,score
from student as s, sc
where cid = 01
and score < 60
and s.sid=sc.sid
order by score desc
+------+--------+---------------------+------+-------+
| Sid | Sname | Sage | Ssex | score |
+------+--------+---------------------+------+-------+
| 04 | 李云 | 1990-08-06 00:00:00 | 男 | 50.0 |
| 06 | 吴兰 | 1992-03-01 00:00:00 | 女 | 31.0 |
+------+--------+---------------------+------+-------+
2 rows in set (0.00 sec)- 按平均成绩从高到低显示所有学生的所有课程的成绩以及平均成绩
select sid,
sum(case when cid=01 then score else null end) as score_01,
sum(case when cid=02 then score else null end) as score_02,
sum(case when cid=03 then score else null end) as score_03,
avg(score)
from sc group by sid
order by avg(score) desc
+------+----------+----------+----------+------------+
| sid | score_01 | score_02 | score_03 | avg(score) |
+------+----------+----------+----------+------------+
| 07 | NULL | 89.0 | 98.0 | 93.50000 |
| 01 | 80.0 | 90.0 | 99.0 | 89.66667 |
| 05 | 76.0 | 87.0 | NULL | 81.50000 |
| 03 | 80.0 | 80.0 | 80.0 | 80.00000 |
| 02 | 70.0 | 60.0 | 80.0 | 70.00000 |
| 04 | 50.0 | 30.0 | 20.0 | 33.33333 |
| 06 | 31.0 | NULL | 34.0 | 32.50000 |
+------+----------+----------+----------+------------+
7 rows in set (0.00 sec)- 查询各科成绩最高分、最低分和平均分：
以如下形式显示：课程 ID，课程 name，最高分，最低分，平均分，及格率，中等率，优良率，优秀率
及格为>=60，中等为：70-80，优良为：80-90，优秀为：>=90
要求输出课程号和选修人数，查询结果按人数降序排列，若人数相同，按课程号升序排列
select c.cid as 课程号, c.cname as 课程名称, count() as 选修人数,
max(score) as 最高分, min(score) as 最低分, avg(score) as 平均分,
sum(case when score >= 60 then 1 else 0 end)/count() as 及格率,
sum(case when score >= 70 and score < 80 then 1 else 0 end)/count() as 中等率,
sum(case when score >= 80 and score < 90 then 1 else 0 end)/count() as 优良率,
sum(case when score >= 90 then 1 else 0 end)/count() as 优秀率
from sc, course c
where c.cid = sc.cid
group by c.cid
order by count() desc, c.cid asc
+-----------+--------------+--------------+-----------+-----------+-----------+-----------+-----------+-----------+-----------+
| 课程号 | 课程名称 | 选修人数 | 最高分 | 最低分 | 平均分 | 及格率 | 中等率 | 优良率 | 优秀率 |
+-----------+--------------+--------------+-----------+-----------+-----------+-----------+-----------+-----------+-----------+
| 01 | 语文 | 6 | 80.0 | 31.0 | 64.50000 | 0.6667 | 0.3333 | 0.3333 | 0.0000 |
| 02 | 数学 | 6 | 90.0 | 30.0 | 72.66667 | 0.8333 | 0.0000 | 0.5000 | 0.1667 |
| 03 | 英语 | 6 | 99.0 | 20.0 | 68.50000 | 0.6667 | 0.0000 | 0.3333 | 0.3333 |
+-----------+--------------+--------------+-----------+-----------+-----------+-----------+-----------+-----------+-----------+
3 rows in set (0.00 sec)- 按各科成
在这里插入代码片绩进行排序，并显示排名， Score 重复时保留名次空缺
select s.*, rank_01, rank_02, rank_03, rank_total
from student s
left join (select sid, rank() over(partition by cid order by score desc) as rank_01 from sc where cid=01) A on s.sid=A.sid
left join (select sid, rank() over(partition by cid order by score desc) as rank_02 from sc where cid=02) B on s.sid=B.sid
left join (select sid, rank() over(partition by cid order by score desc) as rank_03 from sc where cid=03) C on s.sid=C.sid
left join (select sid, rank() over(order by avg(score) desc) as rank_total from sc group by sid) D on s.sid=D.sid
order by rank_total asc
+------+--------+---------------------+------+---------+---------+---------+------------+
| Sid | Sname | Sage | Ssex | rank_01 | rank_02 | rank_03 | rank_total |
+------+--------+---------------------+------+---------+---------+---------+------------+
| 08 | 王菊 | 1990-01-20 00:00:00 | 女 | NULL | NULL | NULL | NULL |
| 07 | 郑竹 | 1989-07-01 00:00:00 | 女 | NULL | 2 | 2 | 1 |
| 01 | 赵雷 | 1990-01-01 00:00:00 | 男 | 1 | 1 | 1 | 2 |
| 05 | 周梅 | 1991-12-01 00:00:00 | 女 | 3 | 3 | NULL | 3 |
| 03 | 孙风 | 1990-05-20 00:00:00 | 男 | 1 | 4 | 3 | 4 |
| 02 | 钱电 | 1990-12-21 00:00:00 | 男 | 4 | 5 | 3 | 5 |
| 04 | 李云 | 1990-08-06 00:00:00 | 男 | 5 | 6 | 6 | 6 |
| 06 | 吴兰 | 1992-03-01 00:00:00 | 女 | 6 | NULL | 5 | 7 |
+------+--------+---------------------+------+---------+---------+---------+------------+
8 rows in set (0.00 sec)15.1 按各科成绩进行排序，并显示排名， Score 重复时合并名次
select s.*, rank_01, rank_02, rank_03, rank_total
from student s
left join (select sid, dense_rank() over(partition by cid order by score desc) as rank_01 from sc where cid=01) A on s.sid=A.sid
left join (select sid, dense_rank() over(partition by cid order by score desc) as rank_02 from sc where cid=02) B on s.sid=B.sid
left join (select sid, dense_rank() over(partition by cid order by score desc) as rank_03 from sc where cid=03) C on s.sid=C.sid
left join (select sid, dense_rank() over(order by avg(score) desc) as rank_total from sc group by sid) D on s.sid=D.sid
order by rank_total asc
select s.*, rank_01, rank_02, rank_03, rank_total
from student s
left join (select sid, dense_rank() over(partition by cid order by score desc) as rank_01 from sc where cid=01) A on s.sid=A.sid
left join (select sid, dense_rank() over(partition by cid order by score desc) as rank_02 from sc where cid=02) B on s.sid=B.sid
left join (select sid, dense_rank() over(partition by cid order by score desc) as rank_03 from sc where cid=03) C on s.sid=C.sid
left join (select sid, dense_rank() over(order by avg(score) desc) as rank_total from sc group by sid) D on s.sid=D.sid
order by rank_total asc- 统计各科成绩各分数段人数：课程编号，课程名称，[100-85]，[85-70]，[70-60]，[60-0] 及所占百分比
select c.cid as 课程编号, c.cname as 课程名称, A.*
from course as c,
(select cid,
sum(case when score >= 85 then 1 else 0 end)/count() as 100_85,
sum(case when score >= 70 and score < 85 then 1 else 0 end)/count() as 85_70,
sum(case when score >= 60 and score < 70 then 1 else 0 end)/count() as 70_60,
sum(case when score < 60 then 1 else 0 end)/count() as 60_0
from sc group by cid) as A
where c.cid = A.cid
+--------------+--------------+------+--------+--------+--------+--------+
| 课程编号 | 课程名称 | cid | 100_85 | 85_70 | 70_60 | 60_0 |
+--------------+--------------+------+--------+--------+--------+--------+
| 01 | 语文 | 01 | 0.0000 | 0.6667 | 0.0000 | 0.3333 |
| 02 | 数学 | 02 | 0.5000 | 0.1667 | 0.1667 | 0.1667 |
| 03 | 英语 | 03 | 0.3333 | 0.3333 | 0.0000 | 0.3333 |
+--------------+--------------+------+--------+--------+--------+--------+
3 rows in set (0.00 sec)- 查询各科成绩前三名的记录
select * from (select *, rank() over(partition by cid order by score desc) as graderank from sc) A
where A.graderank <= 3
| Sid | Cid | score | graderank |
+------+------+-------+-----------+
| 01 | 01 | 80.0 | 1 |
| 03 | 01 | 80.0 | 1 |
| 05 | 01 | 76.0 | 3 |
| 01 | 02 | 90.0 | 1 |
| 07 | 02 | 89.0 | 2 |
| 05 | 02 | 87.0 | 3 |
| 01 | 03 | 99.0 | 1 |
| 07 | 03 | 98.0 | 2 |
| 02 | 03 | 80.0 | 3 |
| 03 | 03 | 80.0 | 3 |
+------+------+-------+-----------+
10 rows in set (0.00 sec)- 查询出只选修两门课程的学生学号和姓名
select s.sid, s.sname, count(cid)
from student s, sc
where s.sid = sc.sid
group by s.sid
having count(cid)=2
+------+--------+------------+
| sid | sname | count(cid) |
+------+--------+------------+
| 05 | 周梅 | 2 |
| 06 | 吴兰 | 2 |
| 07 | 郑竹 | 2 |
+------+--------+------------+
3 rows in set (0.00 sec)- 查询名字中含有「风」字的学生信息
select * from student where sname like ‘%风%’
+------+--------+---------------------+------+
| Sid | Sname | Sage | Ssex |
+------+--------+---------------------+------+
| 03 | 孙风 | 1990-05-20 00:00:00 | 男 |
+------+--------+---------------------+------+
1 row in set (0.00 sec)- 查询 1990 年出生的学生名单
select * from student where year(sage) = 1990
+------+--------+---------------------+------+
| Sid | Sname | Sage | Ssex |
+------+--------+---------------------+------+
| 01 | 赵雷 | 1990-01-01 00:00:00 | 男 |
| 02 | 钱电 | 1990-12-21 00:00:00 | 男 |
| 03 | 孙风 | 1990-05-20 00:00:00 | 男 |
| 04 | 李云 | 1990-08-06 00:00:00 | 男 |
| 08 | 王菊 | 1990-01-20 00:00:00 | 女 |
+------+--------+---------------------+------+
5 rows in set (0.00 sec)- 查询每门课程的平均成绩，结果按平均成绩降序排列，平均成绩相同时，按课程编号升序排列
select C,avg(score) as 平均成绩 from SC group by C
order by 平均成绩 desc,C asc; - 查询平均成绩大于等于 85 的所有学生的学号、姓名和平均成绩
select distinct t.S,s.Sname,t.平均成绩 from Student s,
(select S,avg(score) 平均成绩 from SC
group by S
having avg(score) >= 60)t
where s.S=t.S ; - 查询课程名称为「数学」，且分数低于 60 的学生姓名和分数
select s.Sname,sc.score from Course c,SC sc ,Student s
where Cname = ‘数学’ and c.C=sc.C and sc.score <60 and sc.S = s.S; - 查询所有学生的课程及分数情况（存在学生没成绩，没选课的情况）
select s.S,s.Sname,score from Student s left join SC sc on s.S=sc.S; - 查询任何一门课程成绩在 70 分以上的姓名、课程名称和分数
select s.S,s.Sname,c.Cname,score from Student s ,SC sc,Course c
where s.S=sc.S and sc.C = c.C and
s.S not in (select S from SC where score <70) - 查询不及格的课程
select distinct C from SC where score < 60; - 查询课程编号为 01 且课程成绩在 80 分以上的学生的学号和姓名
select SC.S,s.Sname from SC ,Student s where C = 01 and score >80 and SC.S=s.S; - 求每门课程的学生人数
select C,count(*) from SC group by C ; - 成绩不重复，查询选修「张三」老师所授课程的学生中，成绩最高的学生信息及其成绩
select s.*, max(score)
from student s, teacher t, course c, sc
where s.sid = sc.sid
and sc.cid = c.cid
and c.tid = t.tid
and t.tname = ‘张三’
+------+--------+---------------------+------+------------+
| Sid | Sname | Sage | Ssex | max(score) |
+------+--------+---------------------+------+------------+
| 01 | 赵雷 | 1990-01-01 00:00:00 | 男 | 90.0 |
+------+--------+---------------------+------+------------+
1 row in set (0.00 sec)- 成绩有重复的情况下，查询选修「张三」老师所授课程的学生中，成绩最高的学生信息及其成绩
select * from (
select *, DENSE_RANK() over (order by score desc) A
from SC
where Cid = (select Cid from Course where Tid=(select Tid from Teacher where Tname=‘张三’))
) B
where B.A=1
+------+------+-------+---+
| Sid | Cid | score | A |
+------+------+-------+---+
| 01 | 02 | 90.0 | 1 |
+------+------+-------+---+
1 row in set (0.00 sec)- 查询不同课程成绩相同的学生的学生编号、课程编号、学生成绩
select distinct sc1.* from SC sc1,SC sc2
where sc1.S = sc2.S and sc1.score = sc2.score and sc1.C != sc2.C; - 查询每门功成绩最好的前两名
select * from SC sc
where (select count(distinct sc1.score) from SC sc1 where sc.C= sc1.C and sc1.score >sc.score)<2
order by sc.C,sc.score; - 统计每门课程的学生选修人数（超过 5 人的课程才统计）。
select C,count() from SC group by C having count() >5; - 检索至少选修两门课程的学生学号
select S from SC group by S
having count(distinct C) >=2; - 查询选修了全部课程的学生信息
- 查询各学生的年龄，只按年份来算
select sname, year(now())-year(sage) as age from student
+--------+------+
| sname | age |
+--------+------+
| 赵雷 | 28 |
| 钱电 | 28 |
| 孙风 | 28 |
| 李云 | 28 |
| 周梅 | 27 |
| 吴兰 | 26 |
| 郑竹 | 29 |
| 王菊 | 28 |
+--------+------+
8 rows in set (0.00 sec)- 按照出生日期来算，当前月日 < 出生年月的月日则，年龄减一
select sname, timestampdiff(year, sage, now()) as age from student
+--------+------+
| sname | age |
+--------+------+
| 赵雷 | 28 |
| 钱电 | 27 |
| 孙风 | 28 |
| 李云 | 27 |
| 周梅 | 26 |
| 吴兰 | 26 |
| 郑竹 | 29 |
| 王菊 | 28 |
+--------+------+
8 rows in set (0.00 sec)- 查询本周过生日的学生
select * from student where week(now()) = week(sage)
Empty set (0.00 sec)- 查询下周过生日的学生
select * from student where (week(now())+1) = week(sage)
+------+--------+---------------------+------+
| Sid | Sname | Sage | Ssex |
+------+--------+---------------------+------+
| 04 | 李云 | 1990-08-06 00:00:00 | 男 |
+------+--------+---------------------+------+
1 row in set (0.00 sec)- 查询本月过生日的学生
select * from student where month(now()) = month(sage)
+------+--------+---------------------+------+
| Sid | Sname | Sage | Ssex |
+------+--------+---------------------+------+
| 07 | 郑竹 | 1989-07-01 00:00:00 | 女 |
+------+--------+---------------------+------+
1 row in set (0.00 sec)- 查询下月过生日的学生
select * from student where (month(now())+1) = month(sage)
+------+--------+---------------------+------+
| Sid | Sname | Sage | Ssex |
+------+--------+---------------------+------+
| 04 | 李云 | 1990-08-06 00:00:00 | 男 |
+------+--------+---------------------+------+
1 row in set (0.00 sec)
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