I want to insert data from a source that can contain duplicate data or data that may exist into the table, so simple I want to add data that do not exist in the table and update the table if data exist. In simple language, I wish to upsert the data in a table from the data-source, data source means CSV, excel, another table, etc. For example, suppose we have an Inventory table, and from the CSV source, we need to insert data like prod_name, KPI, brand, qty, price, but it maybe some products already exist in the Inventory table, and we must update those data.
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Syntax
INSERT INTO TableName(ColumnList) VALUES(ValueList) ON CONFLICT target action; |
PostgreSQL - ON CONFLICT clause example
ON CONFLICT clause may help you to resolve the upsert issue.
createtableinventory ( idserialnotnull, prod_nametext, kpitext, qtyinteger, pricedecimal, unique(kpi) ); --added some records to inventory insertintoinventory(prod_name,kpi,qty,price) values('Prod1','prod1_kpi', 20, 100), ('Prod2','prod2_kpi', 30, 200); |
select*frominventoryorderbyidasc;
Result:
Now, we will use the ON CONFLICT clause to upsert data into the Inventory table.
insertintoinventory(prod_name,kpi,qty,price) values('Prod3','prod3_kpi', 12, 122), ('Prod4','prod4_kpi', 28, 234), ('Prod1','prod1_kpi', 100, 110)--- It is existing product ONCONFLICT(kpi) doupdatesetqty=excluded.qty,price=excluded.price; |
select*frominventoryorderbyidasc;
Result:
('Prod1','prod1_kpi', 100, 110)---It is existing product so it updated in invetory as you see in above result set.
('Prod3','prod3_kpi', 12, 122),('Prod4','prod4_kpi', 28, 234) --these data is not duplicate so added in inventory table