![]() ![]() when there's a change made a new row is inserted. There is an additional table customer_data that stores a historical record of the changes made to the customer, i.e. In this tutorial, you have learned about the PostgreSQL upsert feature using the INSERT ON CONFLICT statement.I have a table customer that stores a customer_id, email and reference. The following statement verifies the upsert: Suppose, you want to concatenate the new email with the old email when inserting a customer that already exists, in this case, you use the UPDATE clause as the action of the INSERT statement as follows: INSERT INTO customers ( name, email)ĭO UPDATE SET email = EXCLUDED.email || ' ' || customers.email Code language: SQL (Structured Query Language) ( sql ) The following statement is equivalent to the above statement but it uses the name column instead of the unique constraint name as the target of the INSERT statement. ![]() The statement specified that if the customer name exists in the customers table, just ignore it (do nothing). VALUES( 'Microsoft', CONFLICT ON CONSTRAINT customers_name_keyĭO NOTHING Code language: SQL (Structured Query Language) ( sql ) Suppose Microsoft changes the contact email from to we can update it using the UPDATE statement. However, to demonstrate the upsert feature, we use the following INSERT ON CONFLICT statement: INSERT INTO customers ( NAME, email) ( 'IBM', 'Microsoft', 'Intel', Code language: SQL (Structured Query Language) ( sql ) The following INSERT statement inserts some rows into the customers table. ![]() The name column has a unique constraint to guarantee the uniqueness of customer names. The customers table consists of four columns: customer_id, name, email, and active. ) Code language: SQL (Structured Query Language) ( sql ) The following statement creates a new table called customers to demonstrate the PostgreSQL upsert feature. If you are also working with MySQL, you will find that the upsert feature is similar to the insert on duplicate key update statement in MySQL. If you are using an earlier version, you will need a workaround to have the upsert feature. Notice that the ON CONFLICT clause is only available from PostgreSQL 9.5. WHERE condition – update some fields in the table.
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