如何撰寫如果！= ISNULL在SQL StoredProceddure

Question

在這裏，我寫了一個小的StoredProcedure當ID不使用它顯示否則 請Helpme

Alter procedure Sp_GetEmpById 
(@Id int) 
As 
Begin 
if(@Id!==ISNULL){ 
select Email,Gen,Country from Employee where Emp_Id =@Id 
} 
Else 
print 'The Id Enter By u is Not Availabe '+@Id 
End 

在這裏，我得到兩個錯誤在ISNULL而Then Id Enter By u is Not in Availabe '+@Id @Id

Answer 1

這將編譯，但我不知道您的要求：

create procedure Sp_GetEmpById @Id int 
as 
begin 
if @Id is not NULL 
    select Email,Gen,Country from Employee where Emp_Id = @Id 
else 
    print 'The Id Enter By u is Not Availabe ' + @Id 

end