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Aggiorna e incrementa più colonne su duplicato

Poiché le colonne non sono annullabili, devi passare 0 s invece di null s per le colonne per le quali non vuoi fornire valori in INSERT dichiarazioni e utilizzare confronti con 0 invece di null :

INSERT INTO stock (price, stock1, stock2) VALUES
  ('99', '10', 0), 
  ('120', 0, '12')
ON DUPLICATE KEY UPDATE 
  `stock1-C` = `stock1-C` + (VALUES(stock1) <> 0 AND stock1 <> 0),
  stock1 = stock1 + VALUES(stock1), 
  `stock2-C` = `stock2-C` + (VALUES(stock2) <> 0 AND stock2 <> 0),
  stock2 = stock2 + VALUES(stock2)

Risultato:

prezzo stock1 stock1-C stock2 stock2-C
99 10 0 0 0
120 0 0 12 0

Poi ancora:

INSERT INTO stock (price, stock1, stock2) VALUES
  ('99', '10', 0), 
  ('120', 0, '12')
ON DUPLICATE KEY UPDATE 
  `stock1-C` = `stock1-C` + (VALUES(stock1) <> 0 AND stock1 <> 0),
  stock1 = stock1 + VALUES(stock1), 
  `stock2-C` = `stock2-C` + (VALUES(stock2) <> 0 AND stock2 <> 0),
  stock2 = stock2 + VALUES(stock2)

Risultato:

prezzo stock1 stock1-C stock2 stock2-C
99 20 1 0 0
120 0 0 24 1

Quindi:

INSERT INTO stock (price, stock1, stock2) VALUES
  ('150', '55', 0), 
  ('150', 0, '56')
ON DUPLICATE KEY UPDATE 
  `stock1-C` = `stock1-C` + (VALUES(stock1) <> 0 AND stock1 <> 0),
  stock1 = stock1 + VALUES(stock1), 
  `stock2-C` = `stock2-C` + (VALUES(stock2) <> 0 AND stock2 <> 0),
  stock2 = stock2 + VALUES(stock2)

Risultato:

prezzo stock1 stock1-C stock2 stock2-C
99 20 1 0 0
120 0 0 24 1
150 55 0 56 0

Quindi:

INSERT INTO stock (price, stock1, stock2) VALUES
  ('150', '10', 0), 
  ('150', 0, '10')
ON DUPLICATE KEY UPDATE 
  `stock1-C` = `stock1-C` + (VALUES(stock1) <> 0 AND stock1 <> 0),
  stock1 = stock1 + VALUES(stock1), 
  `stock2-C` = `stock2-C` + (VALUES(stock2) <> 0 AND stock2 <> 0),
  stock2 = stock2 + VALUES(stock2)

Risultato:

prezzo stock1 stock1-C stock2 stock2-C
99 20 1 0 0
120 0 0 24 1
150 65 1 66 1

Vedi la demo .