Tag: join

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Here you can find all blog posts about the Tag: join. You can go back to all blog posts or take a look into our other categories & tags.

Subqueries and performance in PostgreSQL

by Laurenz Albe | 07.2023
  SQL allows you to use subqueries almost anywhere where you could have a table or column name. All you […]

Forcing a join order in PostgreSQL

by Laurenz Albe | 05.2023
  Different from many other database systems, PostgreSQL does not support query hints. That makes it difficult to force the […]

What is an inner join in SQL? And what is an outer join?

by Hans-Jürgen Schönig | 09.2022
A join is a concept in IT which is widely used and often referred to but rarely really understood. What […]

Understanding LATERAL joins in PostgreSQL

by Hans-Jürgen Schönig | 07.2021
LATERAL joins are one of the lesser-known features of PostgreSQL and other relational databases such as Oracle, DB2 and MS […]

About cross join in PostgreSQL

by Laurenz Albe | 06.2021
  For many people, “cross join” is something to be afraid of. They remember the time when they forgot the […]

Join strategies and performance in PostgreSQL

by Laurenz Albe | 06.2020
  (Updated 2023-02-24) There are three join strategies in PostgreSQL that work quite differently. If PostgreSQL chooses the wrong strategy, […]

PostgreSQL: Implicit vs. explicit joins

by Hans-Jürgen Schönig | 11.2018
If you happen to be an SQL developer, you will know that joins are really at the core of the […]

PostgreSQL: Speeding up GROUP BY and joins

by Hans-Jürgen Schönig | 12.2017
A couple of weeks ago I have seen a horribly designed, 370 billion (with a “b”) row Oracle database monster […]

Joining data from multiple Postgres databases

by CYBERTEC Guest | 08.2017
BY Kaarel Moppel - With the heyday of big data and people running lots of Postgres databases, sometimes one needs […]

int4 vs int8 vs uuid vs numeric performance on bigger joins

by CYBERTEC Guest | 04.2017
Some weeks ago at pgDay Paris, during the evening social event, we got into a small "guestimation" with another Postgres […]
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