Commit fe71d278 authored by jackfrued's avatar jackfrued

修复了部分文档和代码中的bug

parent 43c147da
...@@ -8,6 +8,5 @@ Date: 2018-03-01 ...@@ -8,6 +8,5 @@ Date: 2018-03-01
sum = 0 sum = 0
for x in range(1, 101): for x in range(1, 101):
if x % 2 == 0:
sum += x sum += x
print(sum) print(sum)
...@@ -555,6 +555,7 @@ ...@@ -555,6 +555,7 @@
```Python ```Python
from functools import wraps from functools import wraps
from threading import Lock
def singleton(cls): def singleton(cls):
......
...@@ -216,7 +216,7 @@ select stuname as 姓名, year(now())-year(stubirth) as 年龄 from tb_student w ...@@ -216,7 +216,7 @@ select stuname as 姓名, year(now())-year(stubirth) as 年龄 from tb_student w
); );
-- 查询选了两门以上的课程的学生姓名(子查询/分组条件/集合运算) -- 查询选了两门以上的课程的学生姓名(子查询/分组条件/集合运算)
select stuname from tb_student where stuid=( select stuname from tb_student where stuid in (
select stuid from tb_score group by stuid having count(stuid)>2 select stuid from tb_score group by stuid having count(stuid)>2
) )
......
...@@ -10,8 +10,6 @@ ...@@ -10,8 +10,6 @@
<dict> <dict>
<key>connection</key> <key>connection</key>
<dict> <dict>
<key>database</key>
<string>school</string>
<key>host</key> <key>host</key>
<string>120.77.222.217</string> <string>120.77.222.217</string>
<key>kcid</key> <key>kcid</key>
...@@ -47,22 +45,17 @@ ...@@ -47,22 +45,17 @@
<integer>1</integer> <integer>1</integer>
<key>contentSelection</key> <key>contentSelection</key>
<data> <data>
YnBsaXN0MDDUAQIDBAUGOTpYJHZlcnNpb25YJG9iamVjdHNZJGFy YnBsaXN0MDDUAQIDBAUGJSZYJHZlcnNpb25YJG9iamVjdHNZJGFy
Y2hpdmVyVCR0b3ASAAGGoK0HCBUWFxgZHSQoLDE2VSRudWxs0wkK Y2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJX
CwwQFFdOUy5rZXlzWk5TLm9iamVjdHNWJGNsYXNzow0OD4ACgAOA TlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAF
BKMREhOABYAGgAiADFR0eXBlVHJvd3NUa2V5c18QJlNlbGVjdGlv gAdUdHlwZVRyb3dzXxAdU2VsZWN0aW9uRGV0YWlsVHlwZU5TSW5k
bkRldGFpbFR5cGVQcmltYXJ5S2V5ZWREZXRhaWxz0wkKCxobHKCg ZXhTZXTSFwsYGVxOU1JhbmdlQ291bnQQAIAG0hscHR5aJGNsYXNz
gAfSHh8gIVokY2xhc3NuYW1lWCRjbGFzc2VzXxATTlNNdXRhYmxl bmFtZVgkY2xhc3Nlc1pOU0luZGV4U2V0oh8gWk5TSW5kZXhTZXRY
RGljdGlvbmFyeaMgIiNcTlNEaWN0aW9uYXJ5WE5TT2JqZWN00goL TlNPYmplY3TSGxwiI1xOU0RpY3Rpb25hcnmiIiRYTlNPYmplY3Rf
JSehJoAJgAvSCykqK1lOUy5zdHJpbmeAClRzY2lk0h4fLS5fEA9O EA9OU0tleWVkQXJjaGl2ZXLRJyhUZGF0YYABAAgAEQAaACMALQAy
U011dGFibGVTdHJpbmejLS8wWE5TU3RyaW5nWE5TT2JqZWN00h4f ADcAQABGAE0AVQBgAGcAagBsAG4AcQBzAHUAdwB8AIEAoQCmALMA
MjNeTlNNdXRhYmxlQXJyYXmjMjQ1V05TQXJyYXlYTlNPYmplY3TS tQC3ALwAxwDQANsA3gDpAPIA9wEEAQcBEAEiASUBKgAAAAAAAAIB
Hh8iN6IiOFhOU09iamVjdF8QD05TS2V5ZWRBcmNoaXZlctE7PFRk AAAAAAAAACkAAAAAAAAAAAAAAAAAAAEs
YXRhgAEACAARABoAIwAtADIANwBFAEsAUgBaAGUAbABwAHIAdAB2
AHoAfAB+AIAAggCHAIwAkQC6AMEAwgDDAMUAygDVAN4A9AD4AQUB
DgETARUBFwEZAR4BKAEqAS8BNAFGAUoBUwFcAWEBcAF0AXwBhQGK
AY0BlgGoAasBsAAAAAAAAAIBAAAAAAAAAD0AAAAAAAAAAAAAAAAA
AAGy
</data> </data>
<key>contentSortColIsAsc</key> <key>contentSortColIsAsc</key>
<true/> <true/>
...@@ -289,7 +282,7 @@ select stuname as 姓名, year(now())-year(stubirth) as 年龄 from tb_student w ...@@ -289,7 +282,7 @@ select stuname as 姓名, year(now())-year(stubirth) as 年龄 from tb_student w
); );
-- 查询选了两门以上的课程的学生姓名(子查询/分组条件/集合运算) -- 查询选了两门以上的课程的学生姓名(子查询/分组条件/集合运算)
select stuname from tb_student where stuid=( explain select stuname from tb_student where stuid in (
select stuid from tb_score group by stuid having count(stuid)&gt;2 select stuid from tb_score group by stuid having count(stuid)&gt;2
) )
...@@ -314,8 +307,6 @@ select stuname, avgmark from tb_student t1 inner join ...@@ -314,8 +307,6 @@ select stuname, avgmark from tb_student t1 inner join
-- 查询每个学生的姓名和选课数量(左外连接和子查询) -- 查询每个学生的姓名和选课数量(左外连接和子查询)
select stuname, ifnull(total, 0) from tb_student t1 left outer join (select stuid, count(stuid) as total from tb_score group by stuid) t2 on t1.stuid=t2.stuid; select stuname, ifnull(total, 0) from tb_student t1 left outer join (select stuid, count(stuid) as total from tb_score group by stuid) t2 on t1.stuid=t2.stuid;
</string> </string>
<key>table</key>
<string>tb_score</string>
<key>view</key> <key>view</key>
<string>SP_VIEW_CUSTOMQUERY</string> <string>SP_VIEW_CUSTOMQUERY</string>
<key>windowVerticalDividerPosition</key> <key>windowVerticalDividerPosition</key>
...@@ -330,6 +321,137 @@ select stuname, ifnull(total, 0) from tb_student t1 left outer join (select stui ...@@ -330,6 +321,137 @@ select stuname, ifnull(total, 0) from tb_student t1 left outer join (select stui
<array/> <array/>
<key>queryHistory</key> <key>queryHistory</key>
<array> <array>
<string>-- 查询选了两门以上的课程的学生姓名(子查询/分组条件/集合运算)
explain select stuname from tb_student where stuid=any(
select stuid from tb_score group by stuid having count(stuid)&gt;2
)</string>
<string>explain select stuname from tb_student where stuid in (
select stuid from tb_score group by stuid having count(stuid)&gt;2
)</string>
<string>select stuname from tb_student where stuid in (
select stuid from tb_score group by stuid having count(stuid)&gt;2
)</string>
<string>select stuname from tb_student where stuid=(
select stuid from tb_score group by stuid having count(stuid)&gt;2
)</string>
<string>-- 如果存在名为school的数据库就删除它
drop database if exists school;
-- 创建名为school的数据库并设置默认的字符集和排序方式
create database school default charset utf8 collate utf8_bin;
-- 切换到school数据库上下文环境
use school;
-- 创建学院表
create table tb_college
(
collid int not null auto_increment comment '编号',
collname varchar(50) not null comment '名称',
collmaster varchar(20) not null comment '院长',
collweb varchar(511) default '' comment '网站',
primary key (collid)
);
-- 创建学生表
create table tb_student
(
stuid int not null comment '学号',
stuname varchar(20) not null comment '姓名',
stusex bit default 1 comment '性别',
stubirth date not null comment '出生日期',
stuaddr varchar(255) default '' comment '籍贯',
collid int not null comment '所属学院',
primary key (stuid),
foreign key (collid) references tb_college (collid)
);
-- alter table tb_student add constraint fk_student_collid foreign key (collid) references tb_college (collid);
-- 创建教师表
create table tb_teacher
(
teaid int not null comment '工号',
teaname varchar(20) not null comment '姓名',
teatitle varchar(10) default '助教' comment '职称',
collid int not null comment '所属学院',
primary key (teaid),
foreign key (collid) references tb_college (collid)
);
-- 创建课程表
create table tb_course
(
couid int not null comment '编号',
couname varchar(50) not null comment '名称',
coucredit int not null comment '学分',
teaid int not null comment '授课老师',
primary key (couid),
foreign key (teaid) references tb_teacher (teaid)
);
-- 创建选课记录表
create table tb_score
(
scid int auto_increment comment '选课记录编号',
stuid int not null comment '选课学生',
couid int not null comment '所选课程',
scdate datetime comment '选课时间日期',
scmark decimal(4,1) comment '考试成绩',
primary key (scid),
foreign key (stuid) references tb_student (stuid),
foreign key (couid) references tb_course (couid)
);
-- 添加唯一性约束(一个学生选某个课程只能选一次)
alter table tb_score add constraint uni_score_stuid_couid unique (stuid, couid);
-- 插入学院数据
insert into tb_college (collname, collmaster, collweb) values
('计算机学院', '左冷禅', 'http://www.abc.com'),
('外国语学院', '岳不群', 'http://www.xyz.com'),
('经济管理学院', '风清扬', 'http://www.foo.com');
-- 插入学生数据
insert into tb_student (stuid, stuname, stusex, stubirth, stuaddr, collid) values
(1001, '杨逍', 1, '1990-3-4', '四川成都', 1),
(1002, '任我行', 1, '1992-2-2', '湖南长沙', 1),
(1033, '王语嫣', 0, '1989-12-3', '四川成都', 1),
(1572, '岳不群', 1, '1993-7-19', '陕西咸阳', 1),
(1378, '纪嫣然', 0, '1995-8-12', '四川绵阳', 1),
(1954, '林平之', 1, '1994-9-20', '福建莆田', 1),
(2035, '东方不败', 1, '1988-6-30', null, 2),
(3011, '林震南', 1, '1985-12-12', '福建莆田', 3),
(3755, '项少龙', 1, '1993-1-25', null, 3),
(3923, '杨不悔', 0, '1985-4-17', '四川成都', 3);
-- 插入老师数据
insert into tb_teacher (teaid, teaname, teatitle, collid) values
(1122, '张三丰', '教授', 1),
(1133, '宋远桥', '副教授', 1),
(1144, '杨逍', '副教授', 1),
(2255, '范遥', '副教授', 2),
(3366, '韦一笑', '讲师', 3);
-- 插入课程数据
insert into tb_course (couid, couname, coucredit, teaid) values
(1111, 'Python程序设计', 3, 1122),
(2222, 'Web前端开发', 2, 1122),
(3333, '操作系统', 4, 1122),
(4444, '计算机网络', 2, 1133),
(5555, '编译原理', 4, 1144),
(6666, '算法和数据结构', 3, 1144),
(7777, '经贸法语', 3, 2255),
(8888, '成本会计', 2, 3366),
(9999, '审计学', 3, 3366);
-- 插入选课数据
insert into tb_score (stuid, couid, scdate, scmark) values
(1001, 1111, '2017-09-01', 95),
(1001, 2222, '2017-09-01', 87.5),
(1001, 3333, '2017-09-01', 100),
(1001, 4444, '2018-09-03', null),
(1001, 6666, '2017-09-02', 100),
(1002, 1111, '2017-09-03', 65),
(1002, 5555, '2017-09-01', 42),
(1033, 1111, '2017-09-03', 92.5),
(1033, 4444, '2017-09-01', 78),
(1033, 5555, '2017-09-01', 82.5),
(1572, 1111, '2017-09-02', 78),
(1378, 1111, '2017-09-05', 82),
(1378, 7777, '2017-09-02', 65.5),
(2035, 7777, '2018-09-03', 88),
(2035, 9999, curdate(), null),
(3755, 1111, date(now()), null),
(3755, 8888, date(now()), null),
(3755, 9999, '2017-09-01', 92)</string>
<string>select stuname, couname, scmark from tb_student t1 inner join tb_score t3 on t1.stuid=t3.stuid inner join tb_course t2 on t2.couid=t3.couid where scmark is not null order by scmark desc limit 5 offset 10</string> <string>select stuname, couname, scmark from tb_student t1 inner join tb_score t3 on t1.stuid=t3.stuid inner join tb_course t2 on t2.couid=t3.couid where scmark is not null order by scmark desc limit 5 offset 10</string>
<string>select stuname, couname, scmark from tb_student t1 inner join tb_score t3 on t1.stuid=t3.stuid inner join tb_course t2 on t2.couid=t3.couid where scmark is not null order by scmark desc limit 10, 5</string> <string>select stuname, couname, scmark from tb_student t1 inner join tb_score t3 on t1.stuid=t3.stuid inner join tb_course t2 on t2.couid=t3.couid where scmark is not null order by scmark desc limit 10, 5</string>
<string>select stuname, couname, scmark from tb_student t1 inner join tb_score t3 on t1.stuid=t3.stuid inner join tb_course t2 on t2.couid=t3.couid where scmark is not null order by scmark desc limit 5, 5</string> <string>select stuname, couname, scmark from tb_student t1 inner join tb_score t3 on t1.stuid=t3.stuid inner join tb_course t2 on t2.couid=t3.couid where scmark is not null order by scmark desc limit 5, 5</string>
...@@ -347,29 +469,11 @@ select stuname, couname, scmark from tb_student t1, tb_course t2, tb_score t3 wh ...@@ -347,29 +469,11 @@ select stuname, couname, scmark from tb_student t1, tb_course t2, tb_score t3 wh
<string>select stuname, avgmark from tb_student t1, (select stuid, avg(scmark) as avgmark from tb_score group by stuid) t2 where t1.stuid=t2.stuid</string> <string>select stuname, avgmark from tb_student t1, (select stuid, avg(scmark) as avgmark from tb_score group by stuid) t2 where t1.stuid=t2.stuid</string>
<string>select stuname, ifnull(total, 0) from tb_student t1 left outer join (select stuid, count(stuid) as total from tb_score group by stuid) t2 on t1.stuid=t2.stuid</string> <string>select stuname, ifnull(total, 0) from tb_student t1 left outer join (select stuid, count(stuid) as total from tb_score group by stuid) t2 on t1.stuid=t2.stuid</string>
<string>select stuname, ifnull(total,0) from tb_student t1 left outer join (select stuid, count(stuid) as total from tb_score group by stuid) t2 on t1.stuid=t2.stuid</string> <string>select stuname, ifnull(total,0) from tb_student t1 left outer join (select stuid, count(stuid) as total from tb_score group by stuid) t2 on t1.stuid=t2.stuid</string>
<string>-- 查询选了两门以上的课程的学生姓名(子查询/分组条件/集合运算)
select stuname from tb_student where stuid=(
select stuid from tb_score group by stuid having count(stuid)&gt;2
)
-- 查询学生姓名、课程名称以及成绩(连接查询)
-- 查询选课学生的姓名和平均成绩(子查询和连接查询)
-- 外连接(outer join):左外连接 / 右外连接 / 全外连接
-- 查询每个学生的姓名和选课数量(左外连接和子查询)
select stuname, ifnull(total, 0) from tb_student t1 left outer join (select stuid, count(stuid) as total from tb_score group by stuid) t2 on t1.stuid=t2.stuid</string>
<string>select stuname, total from tb_student t1 left outer join
(select stuid, count(stuid) as total from tb_score group by stuid) t2 on t1.stuid=t2.stuid</string>
<string>select stuname, total from tb_student t1 inner join
(select stuid, count(stuid) as total from tb_score group by stuid) t2 on t1.stuid=t2.stuid</string>
<string>select stuid, count(stuid) from tb_score group by stuid</string>
<string>select stuname, couname, scmark from tb_student t1 inner join tb_score t3 on t1.stuid=t3.stuid inner join tb_course t2 on t2.couid=t3.couid</string>
</array> </array>
<key>rdbms_type</key> <key>rdbms_type</key>
<string>mysql</string> <string>mysql</string>
<key>rdbms_version</key> <key>rdbms_version</key>
<string>5.5.60-MariaDB</string> <string>5.7.26</string>
<key>version</key> <key>version</key>
<integer>1</integer> <integer>1</integer>
</dict> </dict>
......
...@@ -401,7 +401,7 @@ ...@@ -401,7 +401,7 @@
); );
-- 查询选了两门以上的课程的学生姓名(子查询/分组条件/集合运算) -- 查询选了两门以上的课程的学生姓名(子查询/分组条件/集合运算)
select stuname from tb_student where stuid=( select stuname from tb_student where stuid in (
select stuid from tb_score group by stuid having count(stuid)>2 select stuid from tb_score group by stuid having count(stuid)>2
) )
......
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