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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
Joins: Learn how to use an inner join and an outer join in PostgreSQL today by reading our tutorial. Also covers semi and full joins.

Understanding LATERAL joins in PostgreSQL

by Hans-Jürgen Schönig | 07.2021
LATERAL joins are extremely useful & can be utilized in many cases to speed up operations, or to simply make code a lot easier to understand.

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
How to use implicit and explicit joins in PostgreSQL. What are the performance differences between these two types of join?

Joining data from multiple Postgres databases

by CYBERTEC Guest | 08.2017
How to join or search data from multiple independent PostgreSQL databases to present it as one logical entity. Here are 4 methods.

int4 vs int8 vs uuid vs numeric performance on bigger joins

by CYBERTEC Guest | 04.2017
Brief overview of the performance of different datatypes on bigger joins. How much performance gets lost? Which one is better? Have a look!

Two simple Postgres tips to kick-start the year 2017

by CYBERTEC Guest | 01.2017
Let's start the new year with some PostgreSQL trickery. We present you with two nice PostgreSQL tricks that are really useful.
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