When to use upsert or update in PostgreSQL?
The idea is that when you insert a new row into the table, PostgreSQL will update the row if it already exists, otherwise, PostgreSQL inserts the new row. That is why we call the action is upsert (update or insert).
When to use insert on Conflict Statement in PostgreSQL?
The idea is that when you insert a new row into the table, PostgreSQL will update the row if it already exists, otherwise, PostgreSQL inserts the new row. That is why we call the action is upsert (update or insert). To use the upsert feature in PostgreSQL, you use the INSERT ON CONFLICT statement as follows:
Is there an equivalent to insert in PostgreSQL?
Postgres hasn’t implemented an equivalent to INSERT OR REPLACE. From the ON CONFLICT docs (emphasis mine): It can be either DO NOTHING, or a DO UPDATE clause specifying the exact details of the UPDATE action to be performed in case of a conflict. Though it doesn’t give you shorthand for replacement, ON CONFLICT DO UPDATE applies more generally,
When to use all excluded values in PostgreSQL?
PostgreSQL INSERT ON CONFLICT UPDATE (upsert) use all excluded values. When you are upserting a row (PostgreSQL >= 9.5), and you want the possible INSERT to be exactly the same as the possible UPDATE, you can write it like this: INSERT INTO tablename (id, username, password, level, email) VALUES (1, ‘John’, ‘qwerty’, 5,
Why is the ALTER TABLE blocked in PostgreSQL?
The table above tells us that an ALTER TABLE is blocked waiting for two UPDATE s to finish, while the UPDATE with SET y = 10 is waiting for the UPDATE with SET y = 5 to finish.
How to create a trigger on insert or update?
I want to create a trigger on the car table which will insert or delete on the fuel table depending on a certain value. I am not including any row data as the description of the trigger does not need it. Runs on an insert or update. Inserts Car.id into Fuel table if Car.fuel is true.