lab4-1

use departaments

-- timed table
select agreementId,  sum(price) as total_price
into #AgreementSummary
from Agreement
group by agreementId

select * from Agreement
join #AgreementSummary on Agreement.agreementId= #AgreementSummary.agreementId

drop table #AgreementSummary

-- if
declare @youngest Date
 
select @youngest = max(birthday) from Employee
 
if datediff(year, @youngest, getdate()) >= 18
    print 'Все сотрудники совершеннолетние'
else
    print 'НЕ ВСЕ совершеннолетние'

----------------
declare @sum money, @departamentName varchar(100), @countOfWork int, @amountOfGroup int
 
SELECT @sum = sum(price), 
@departamentName = departamentName,
@countOfWork = count(*)
from DesignWork
inner join Departament on Departament.departamentId = DesignWork.departamentId
inner join Agreement on Agreement.agreementId = DesignWork.agreementId
group by Departament.departamentName
having count(*) >= 2

IF @sum > 4000
    BEGIN
        PRINT 'Название отдела: ' + @departamentName 
        PRINT 'Количество работ ' + CONVERT(varchar(50), @countOfWork)
        PRINT 'Сумма ' + CONVERT(varchar(50), @sum)
    END;
ELSE
    PRINT 'Слишком дешево'


-- While
DECLARE @number INT, @factorial INT
SET @factorial = 1;
SET @number = 10;
 
WHILE @number > 0
    BEGIN
        SET @factorial = @factorial * @number
        SET @number = @number - 1
    END;
 
PRINT @factorial

---------

CREATE TABLE #Accounts ( CreatedAt DATE, Balance MONEY)
 
DECLARE @rate FLOAT, @period INT, @summa MONEY, @date DATE
SET @date = GETDATE()
SET @rate = 0.065;
SET @period = 5;
SET @summa = 10000;
 
WHILE @period > 0
    BEGIN
        INSERT INTO #Accounts VALUES(@date, @summa)
        SET @period = @period - 1
        SET @date = DATEADD(year, 1, @date)
        SET @summa = @summa + @summa * @rate
    END;
 
SELECT * FROM #Accounts

-- sklyar function

GO
CREATE FUNCTION dbo.calculate_work_days(@startDate date, @endDate date)
RETURNS int AS
BEGIN
  RETURN datediff(DAY, @startDate, @endDate)
END

GO
drop function dbo.calculate_work_days

GO
SELECT dbo.calculate_work_days(startDate, endDate) as 'number of work days'
FROM DesignWork

-- Table value from function

GO
CREATE FUNCTION dbo.getMonthName(@DATE date) RETURNS CHAR(15)
WITH EXECUTE AS CALLER AS
BEGIN
  DECLARE @month int; 
  DECLARE @monthName char(15); 
  SET @month= MONTH(@DATE)

  IF (@month=1) SET @monthName='Январь'; 
  IF (@month=2) SET @monthName='Февраль';
  IF (@month=3) SET @monthName='Март';
  IF (@month=4) SET @monthName='Апрель'; 
  IF (@month=5) SET @monthName='Май';
  IF (@month=6) SET @monthName='Июнь'; 
  IF (@month=7) SET @monthName='Июль';
  IF (@month=8) SET @monthName='Август';
  IF (@month=9) SET @monthName='Сентябрь'; 
  IF (@month=10) SET @monthName='Октябрь'; 
  IF (@month=11) SET @monthName='Ноябрь';
  IF (@month=12) SET @monthName='Декабрь';

  RETURN(@monthName); 
END;
GO
SELECT *, dbo.getMonthName(birthday) AS 'Месяц'
FROM Employee;

-- Procedure to select data
GO


-- select
create procedure Employees as
begin
  select * from Employee
end
GO

exec Employees
GO

create procedure EmployeesWithMonthName as
begin
  SELECT *, dbo.monthName(birthday) AS 'Месяц'
FROM Employee;
end
GO
exec EmployeesWithMonthName
GO
-- Procedure without params
GO

create procedure CurrentMonthName as
begin
  print dbo.monthName(getdate())
end
GO

exec CurrentMonthName  
GO

create procedure multiplication as
begin
  declare @a int;
  set @a = 2;
  declare @b int;
  set @b = 10;

  print convert(varchar(5), @a * @b)
end
GO
exec multiplication

-- Procedure with params

CREATE PROCEDURE AddEmployee
    @name VARCHAR(50),
    @position VARCHAR(100),
    @isMale bit,
	@address VARCHAR(100),
	@birthday date,
    @departamentId int
AS
IF(not @birthday >= getdate())
	INSERT INTO Employee
	VALUES(@name, @position , @isMale, @address, @birthday, @departamentId)
ELSE 
	PRINT 'Неверная дата рождения'
	RETURN
GO

EXEC AddEmployee 'Боровой Владислав', 'Техник', 1, 'Jakuba Kolasa 53/3/83', '2031-08-17', null
GO

CREATE PROCEDURE UpdateEmployee
    @id int,
	@birthday date
AS
update Employee
set birthday= @birthday
where @id = employeeId
GO	

exec UpdateEmployee 4, '2021-08-17'
GO

select * from Organization
GO
CREATE PROCEDURE UpdateOrganizationCity
    @id int,
	@city nvarchar(50)
AS
IF(@city = 'Гродна')
	RETURN 

update Organization
set city= @city
where @id = organizationId
GO	

exec UpdateOrganizationCity 4, 'Гродна'
GO

exec UpdateOrganizationCity 1, 'Киев'
GO