drop database task1;
create database task1 character set utf8 /*collate utf8_unicode_ci*/;
use task1;


create table Users (
id int auto_increment primary key,
Name varchar(20),
login varchar(20),
email varchar(20),
department ENUM('Производство', 'Поддержка пользователей', 'Управление', 'Администрация'));
describe Users;


create table Project (
id int auto_increment primary key,
Name varchar(15),
Description text not null,
Date_open date not null,
Date_close date);
describe Project;


create table Tasks (
id int auto_increment primary key,
Project_id int,
Title varchar(15),
Priority int,
Description text,
task_Condition ENUM('Новая','Переоткрыта','Выполняется','Закрыта'),     /*Condition reserved*/
Evaluation int,
Elapsed_time int,
exec_user_id int,
creat_user_id int not null,
creat_date date);
describe Tasks;

/*1-2:*/

insert into Project (Name, Date_open) values ('РТК', '2016-01-31');
insert into Project (Name, Date_open, Date_close) values ('СС.Коннект', '2016-01-31', '2016-12-31');
insert into Project (Name, Date_open, Date_close) values ('Демо-Сибирь', '2015-02-23', '2016-01-31');
insert into Project (Name, Date_open, Date_close) values ('МВД-Онлайн', '2016-05-22','2016-01-31');
insert into Project (Name, Date_open) values ('Поддержка', '2016-06-07');

insert into Users (name, login, email, department) values ('Касаткин Артем', 'kasatkin', 'kasatka@gmail.com', 'Администрация');
insert into Users (name, login, email, department) values ('Петрова София', 'petrova', 'petrova@gmail.com', 'Бухгалтерия');
insert into Users (name, login, email, department) values ('Дроздов Федр', 'drosdov', 'drosdov@gmail.com', 'Поддержка пользователей');
insert into Users (name, login, email, department) values ('Иванова Василина', 'ivanova', 'ivanova@gmail.com', 'Бухгалтерия');
insert into Users (name, login, email, department) values ('Беркут Алексей', 'aerkut', 'berkut@gmail.com', 'Управление');
insert into Users (name, login, email, department) values ('Белова Вера', 'velova', 'belova@gmail.com', 'Управление');
insert into Users (name, login, email, department) values ('Макенрой Алексей', 'makenroy', 'makenroy@gmail.com', 'Управление');

/*insert Tasks*//*TODO*/exec_user_id

insert into Tasks (Title, Priority, exec_user_id,creat_user_id) values ('задание', 62, 1,7);
insert into Tasks (Title, Priority, exec_user_id,creat_user_id) values ('еще задание ', 64, 2,7);
insert into Tasks (Title, Priority, exec_user_id) values ('задание2', 73, 3);
insert into Tasks (Title, Priority, exec_user_id) values ('задание3', 1, 1);
insert into Tasks (Title, Priority, exec_user_id,creat_user_id) values ('aas', 32, 4,7);
insert into Tasks (Title, Priority, exec_user_id) values ('xzc', 7, 4);


insert into Tasks (Title, Priority, exec_user_id, creat_date) values ('xzasdc', 7, 1,'2016-01-01');
insert into Tasks (Title, Priority, exec_user_id, creat_date) values ('asdgas', 7, 1,'2016-01-02');
insert into Tasks (Title, Priority, exec_user_id, creat_date) values ('asdfee', 7, 1,'2016-01-03');

insert into Tasks (Title, Priority, exec_user_id, creat_user_id) values ('daf', 1, 2,1);
insert into Tasks (Title, Priority, exec_user_id, creat_user_id) values ('aas', 32, 2,2);
insert into Tasks (Title, Priority, exec_user_id, creat_user_id) values ('xzc', 7, 2,2);
insert into Tasks (Title, Priority, exec_user_id, creat_user_id) values ('qw23e', 62, 1,7);
insert into Tasks (Title, Priority, exec_user_id, creat_user_id) values ('q12we', 3, 2,7);
insert into Tasks (Title, Priority, exec_user_id, creat_user_id) values ('qw12323e', 62, 1,7);
insert into Tasks (Title, Priority, exec_user_id, creat_user_id) values ('qw12323e', 62, 1,7);


/*1-3:*/

/*a*/select * from Tasks;

/*b*/select Name, department from Users;

/*c*/select login, email from Users;

/*d*/select Title from Tasks where Priority>50;

/*e*/select Name from Users INNER JOIN Tasks ON Tasks.exec_user_id = Users.id;

/*f*/(select distinct exec_user_id from Tasks where exec_user_id not in
(select distinct creat_user_id from Tasks)) union (select creat_user_id from Tasks);

/*k*/select * from Tasks where  creat_user_id not in
(select id from Users where Name = 'Петрова София') and exec_user_id in
(select id from Users where Name in ('Иванова Василина','Сидорова','Беркут Алексей'));

/*1-4:*/

select * from Tasks where exec_user_id = (select id from Users where name = 'Касаткин Артем') and creat_date in ('2016-01-01','2016-01-02','2016-01-03'); /* in or = ?*/

/*1-5:*/

select * from Tasks where exec_user_id = (select id from Users where name = 'Петрова София') and creat_user_id in (select id from Users where department in ('Администрация', 'Бухгалтерия', 'Развитие'));

/*1-6:*/

/*b:creat_user_id int not null */

insert into Tasks (creat_user_id) values ('1'); /

select * from Tasks where exec_user_id is null;

update Tasks set exec_user_id = 2 where exec_user_id is null;

/*1-7:*/

create table Tasks2 like Tasks;

insert Tasks2 select * from Tasks;

/*1-8:*/


select * from Users where Name not like '%а' and Name not like '%a %';

select * from Users where login like 'p%' and login like '%r%';



/*2 deadline = 25.03
  3 deadline = 08.04 */

/*TASK_2*/

/*2-1:*/

select exec_user_id from Tasks
group by exec_user_id
order by avg(Priority)
limit 3;


select avg(Priority) from Tasks;

select avg(Priority) from Tasks
group by id;

select avg(Priority) from Tasks
group by null;



/*2-2:*/

select concat(count(*),' - ', month(creat_date), ' - ', exec_user_id) from Tasks
where year(creat_date) = 2016
group by exec_user_id, month(creat_date);

/*2-3:*/

select exec_user_id, sum(Elapsed_time-Evaluation), sum(Evaluation- Elapsed_time)from Tasks
group by id;


select
A.exec_user_id,
A.summ, B.summ
from (select exec_user_id, sum(Evaluation- Elapsed_time) as summ
    from Tasks where Evaluation>Elapsed_time
    group by exec_user_id) as A
join (select exec_user_id, sum( Elapsed_time-Evaluation) as summ
    from Tasks where Evaluation<Elapsed_time
    group by exec_user_id) as B
on A.exec_user_id = B.exec_user_id;



/*2-4:*/

select distinct
if( creat_user_id<exec_user_id, concat(creat_user_id, ' - ', exec_user_id), concat(exec_user_id, ' - ', creat_user_id) )
from Tasks;

/*2-5:*/

select login from Users
order by length(login)
desc limit 1;

/*2-6:*/

SET sql_mode = 'PAD_CHAR_TO_FULL_LENGTH';

drop table test
Create table test
(c CHAR(10),
v VARCHAR(10));

Insert into test
values('asd','asdasd');

select length(c) as 'CHAR', length(v) as 'VARCHAR' from test;

/*2-7:*/

select Users.Name, max(Tasks.Priority)
from Users, Tasks
where Users.id = Tasks.exec_user_id
group by Users.id;

/*2-8:*/

select creat_user_id, sum(Elapsed_time) from Tasks
where Priority > (select avg(Priority) from Tasks)
group by creat_user_id;

/*2-9:*/
drop view taskz;

create view taskz as
select exec_user_id,
count(*) as total_tasks
from Tasks
group by exec_user_id;

select * from taskz;




drop view taskz2;

create view taskz2 as
select exec_user_id,
sum(Evaluation > Elapsed_time) as in_time
from Tasks
where Evaluation is not null and Elapsed_time is not null
group by exec_user_id;

select * from taskz2;




drop view taskz3;

create view taskz3 as
select exec_user_id,
sum(Evaluation < Elapsed_time) as not_in_time
from Tasks
where Evaluation is not null and Elapsed_time is not null
group by exec_user_id;

select * from taskz3;



drop view taskz4;

create view taskz4 as
select exec_user_id,
sum((task_Condition = 'Переоткрыта') or (task_Condition ='Новая')) as otkrita,
sum(task_Condition = 'Закрыта') as zakr,
sum(task_Condition = 'Выполняется') as vipoln
from Tasks
group by exec_user_id;

select * from taskz4;



drop view taskz4;

create view taskz4 as
select exec_user_id,
sum(Evaluation) as summ_potr_vremya,
sum(Evaluation - Elapsed_time) as pererab
from Tasks
where Evaluation is not null and Elapsed_time is not null
group by exec_user_id;

select * from taskz4;




drop view taskz4;

create view taskz4 as
select exec_user_id,
sum(length(Description)) as descr_lengt,
avg(Evaluation - Elapsed_time) as avg_pererab,
max(Elapsed_time) as max_Elapsed_time
from Tasks
where Evaluation is not null and Elapsed_time is not null and Description is not null
group by exec_user_id;

select * from taskz4;





/*2-10:*/


select Name, Title from Users, Tasks where Users.id = exec_user_id;


select Name,id from Users where Users.id not in (select exec_user_id from Tasks);


select Name, ifnull((select count(*) from Tasks where creat_user_id = Users.id group by creat_user_id ),0) as num_of_tasks from Users;