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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.

PostgreSQL exclusion constraints: Beyond UNIQUE

by Hans-Jürgen Schönig | 07.2016
UPDATED AUGUST 2023: A couple of years ago, PostgreSQL introduced so called “exclusion constraints”, which are defined with the EXCLUDE […]

BRIN indexes: Correlation, correlation, correlation

by Hans-Jürgen Schönig | 06.2016
BRIN indexes have been introduced in PostgreSQL 9.5. While BRIN indexes are definitely a win, people tend to exaggerate and use them far too frequently.

Watch command - how to watch a PostgreSQL database

by Hans-Jürgen Schönig | 06.2016
How to use the watch command: allows you to watch the program output change over time. It is therefore a perfect tool to track down errors.

Permissions: A little trickery

by Hans-Jürgen Schönig | 12.2015
Learn how to use the INHERIT keyword in PostgreSQL, which allows a role to inherit permissions from another role. There is a catch, however.

Producing LaTeX output

by Hans-Jürgen Schönig | 12.2015
By coincidence I noticed that psql can produce perfect LaTeX code. How cool is that? We show you how to do it, with examples.

Flexible grouping: Some dirty SQL trickery

by Hans-Jürgen Schönig | 11.2015
How to group PostgreSQL data with some dirty SQL trickery. Find the difference between timestamps; how to use flexible grouping.

Fuzzy search unleashed

by Hans-Jürgen Schönig | 08.2015
Fuzzy search solves the problem of spelling errors in searches. The goal is really to make sure that users have a chance - even with typos.

Transactional DDLs

by Hans-Jürgen Schönig | 07.2015
In PostgreSQL all major DDLs (CREATE TABLE, ...) are fully transactional. However, there are some exceptions.

DROP TABLE: Killing shared_buffers

by Hans-Jürgen Schönig | 06.2015
UPDATED August 2023: How to tune shared buffers - when it is large, PostgreSQL performance issues may result: what to do to fix the problem.

PostgreSQL 9.4 aggregate filter clauses: They do pay off

by Hans-Jürgen Schönig | 02.2015
In this blog ppost we cover the impact of aggregate FILTER clauses have on performance. Find out more about aggregation filters.
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