Answers for "sql if not exists insert else update"

sql server if exists update else insert

if exists(SELECT * from Student where FirstName='Akhil' and LastName='Mittal')            
BEGIN            
 update Student set FirstName='Anu' where FirstName='Akhil'  
End                    
else            
begin  
insert into Student values(1,'Akhil','Mittal',28,'Male',2006,'Noida','Tenth','LFS','Delhi')  
end 

if not exists insert sql

IF NOT EXISTS (SELECT * FROM EmailsRecebidos 
                   WHERE De = @_DE
                   AND Assunto = @_ASSUNTO
                   AND Data = @_DATA)
   BEGIN
       INSERT INTO EmailsRecebidos (De, Assunto, Data)
       VALUES (@_DE, @_ASSUNTO, @_DATA)
   END