int va nvarchar li columblarni qo'shib chiqarish uchun int lini nvarcharga o'tqazish kerak

#Select 1

SELECT CASE
WHEN A + B > C AND B + C > A AND A + C > B THEN
CASE
WHEN A = B AND B = C THEN 'Equilateral'
WHEN A = B OR B = C OR A = C THEN 'Isosceles'
ELSE 'Scalene'
END
ELSE 'Not A Triangle'
END
FROM TRIANGLES;

Create database HR12
Create table
EMPLOYE(
Employe_ID int primary key,
Employe_FName nvarchar (99),
Employe_LName nvarchar (99),
Employe_hiredate date ,
Employe_Title nvarchar (99) default 'UNKNOWN'

)
insert into EMPLOYE(Employe_ID,Employe_FName,Employe_LName)
values (1213,'Hoshimjon','Roziyev')

select * from EMPLOYE

create table SKILL(
Skill_ID int identity (100,10) primary key,
Skill_Name nvarchar (99),
Skill_Description nvarchar (155)
)

Create table CERTIFIED(
Employe_ID int references EMPLOYE(Employe_ID),
Skill_ID int check (Skill_ID>99 and Skill_ID<221) references SKILL(Skill_ID),
Certified_Date date not null

)

Create database Store12
Create table Employe(
emp_code int identity primary key,
emp_title nvarchar(111),
emp_lname nvarchar(111),
emp_fname nvarchar(111),
emp_initial nvarchar(111) default ' ',
emp_dob date not null,
store_code int default 3
)
create table Region(
region_code int identity(1,1) primary key,
region_des nvarchar(111)
)
create table Store (
store_code int identity(1,1) primary key,
store_name nvarchar(111),
store_ytd_sales float check(store_ytd_sales>0),
region_code int references Region(region_code),
emp_code int references Employe(emp_code)

)

alter table Employe add constraint Employe_store_code_FK
foreign key (store_code) references Store (store_code)

--- CODE-1 ---
Select E.Name as Employee, isnull(M.Name, 'No Manager')as Manager
from Manager E
left join Manager M
on e.ManagerID =m.EmployeeId

--- CODE-2 ---
Select E.Name as Employee,
case
When M.Name is null Then 'No Manager' Else M.Name
End
as Manager
From Manager E
left join Manager M
on e.ManagerID =m.EmployeeId

--- CODE-3 ---
Select E.Name as Employee,coalesce(m.Name, 'No Manager') as Manager
From Manager E
left join Manager M
on e.ManagerID =m.EmployeeId

#NULL qiymatni yozuvga almashtirish **Faqat ekranga chiqarishda almashadi