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#id column is assumed to be primary key
INSERT INTO destination_table(id,name)
SELECT id, name
FROM source_table s
WHERE NOT EXISTS (
SELECT 1
FROM destination_table d
WHERE d.id = s.id
);SELECT customer_id, first_name
FROM Customers
WHERE NOT EXISTS (
SELECT order_id
FROM Orders
WHERE Orders.customer_id = Customers.customer_id
);-- The SQL NOT EXISTS Operator will act quite opposite to EXISTS Operator.
-- It is used to restrict the number of rows returned by the SELECT Statement.
SELECT column_name
FROM table_name
WHERE NOT EXISTS (Write Subquery to Check);BEGIN
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
END