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Conditional foreign keys and polymorphism in SQL: 4 Methods

by Laurenz Albe | 08.2023
  This article is about the notoriously difficult problem of “conditional foreign keys”. In object-oriented programming languages, polymorphism is a […]

Indexing "LIKE" in PostgreSQL and Oracle

by Laurenz Albe | 08.2023
© Laurenz Albe 2023 Unless you use the binary collation, creating a b-tree index to support a LIKE condition in […]

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 […]

Unexpected downsides of UUID keys in PostgreSQL

by Ants Aasma | 06.2023
There are various compelling reasons to use universally unique identifiers (UUID) as primary keys. Two examples are: To be able […]

What is a schema in PostgreSQL?

by Hans-Jürgen Schönig | 06.2023
What is a schema in PostgreSQL? Why do we need a schema and how can schemas be used to make your life easier? Let's find out.

PostgreSQL ALTER DEFAULT PRIVILEGES - permissions explained

by Laurenz Albe | 05.2023
  Many people have heard that ALTER DEFAULT PRIVILEGES makes it easy to allow other users access to tables. But […]

EXPLAIN (GENERIC_PLAN): New in PostgreSQL 16

by Laurenz Albe | 04.2023
  A while ago, I wrote about how difficult it is to get an execution plan for a parameterized query. […]

Parallel aggregate - PostgreSQL 16 - better performance

by Pavlo Golub | 04.2023
What is a parallel aggregate? In PostgreSQL, a parallel aggregate refers to a way of processing aggregate functions (such as […]

Breaking your PostgreSQL database with bad CHECK constraints

by Laurenz Albe | 03.2023
I am on a spree! After writing about breaking your database and transaction ID wraparound, here I am writing about […]

PostgREST: Get started with automated PostgreSQL APIs

by Hans-Jürgen Schönig | 03.2023
PostgREST quick-start guide: Writing APIs by hand is a lot of work. PostgREST automatically generates an API out of your PostgreSQL database.
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