Google BigQuery - how to upsert into tables using MERGE Statement?
Problem: Insert row only if it does not exist, otherwise - update an existing row
Use the merge function in BigQuery:
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)
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