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Tag: sql help

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

Gaps in sequences in PostgreSQL

by Laurenz Albe | 09.2021
  Most database tables have an artificial numeric primary key, and that number is usually generated automatically using a sequence. […]

PostgreSQL grouping sets: ROLLUP & CUBE

by Hans-Jürgen Schönig | 08.2021
PostgreSQL is one of the best OLTP databases (OLTP = online transaction processing) in the world. However, it can do […]

PostgreSQL: LIMIT vs FETCH FIRST ROWS ... WITH TIES

by Hans-Jürgen Schönig | 07.2021
Most people in the SQL and in the PostgreSQL community have used the LIMIT clause provided by many database engines. […]

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 […]

Creating and refreshing materialized views in PostgreSQL

by Hans-Jürgen Schönig | 06.2021
A “materialized view” is a database object which stores the result of a precalculated database query and makes it easy […]

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 […]

Disabling autocommit in PostgreSQL can damage your health

by Laurenz Albe | 06.2021
  When analyzing customer's problems, I have seen the mess you can get into if you disable autocommit in your […]

How to interpret PostgreSQL EXPLAIN ANALYZE output

by Laurenz Albe | 05.2021
  UPDATED July 2023: EXPLAIN ANALYZE is the key to optimizing SQL statements in PostgreSQL. This article does not attempt […]

UUID, serial or identity columns for PostgreSQL auto-generated primary keys?

by Laurenz Albe | 05.2021
  UPDATED 14.05.2022: Sometimes customers ask me about the best choice for auto-generated primary keys. In this article, I'll explore […]

What to return from a PostgreSQL row level trigger?

by Laurenz Albe | 04.2021
  In this article, I'll talk about row level triggers, which are the most frequently used kind of triggers. I […]
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