MERGE command syntax in Google Bigquery

A MERGE statement is a DML statement that can combine INSERT, UPDATE, and DELETE operations into a single statement and perform the operations atomically

MERGE dataset.Inventory T
USING dataset.NewArrivals S
ON T.product = S.product
WHEN MATCHED THEN
  UPDATE SET quantity = T.quantity + S.quantity
WHEN NOT MATCHED THEN
  INSERT (product, quantity) VALUES(product, quantity)

nVector

posted on 27 Sep 19