where not exists sql query 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 not

Returns true if a record DOESN’T meet the condition.
Example: Returns true if the user’s first_name doesn’t end with ‘son’.
SELECT * FROM users
WHERE first_name NOT LIKE '%son';

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