sql insert if not exists else update code example

Example 1: 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

Example 2: 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

Example 3: mysql insert exists update

INSERT INTO table (column_list)
VALUES (value_list)
ON DUPLICATE KEY UPDATE
   c1 = v1, 
   c2 = v2,
   ...;

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