1/23/2024 0 Comments Postgres multiple joins> Custom Scan (ChunkAppend) on position (cost=.85 rows=19735000 width=23) Merge Cond: (position."time" = event_data."time") I looked at the querry plan in detail and it looks like for my initial query, only a join is executed and not a left join which exactly explains my results.Įxplain for original query: Merge Join (cost=6.97 rows=2697607 width=16) I thought it is smart to access both tables by their index. Your guess was right, I get the right result.ĭrawback is that it takes more time because I dont use any index (which is on machine_id and time) for the event table. JOIN public.example_two ON example_one.id = example_two.Hello for your answer. There exists a table called public.example_one and another table called public.example_two in the same database.Ī SQL query such as: SELECT * FROM public.example_one JOIN schema_two.example_two ON example_one.id = example_two.id There exists a table called schema_one.example_one and another table called schema_two.example_two in the same database.Ī SQL query such as: SELECT * FROM schema_one.example_one Tables must originate from the same database. Even if the two databases were both Postgresql databases, you will not be able to join. JOIN _two ON example_one.id = example_two.id There exists a table called public.example_one in a Postgresql database called post and another table called public.example_two in an Athena database called ath.Ī SQL query such as: SELECT * FROM _one Joined tables can be from the same schema within a database.
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