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Category: How To

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

Speeding up “min” and “max”

by Hans-Jürgen Schönig | 09.2013
In this blog you can read why indexes are a great tool. And how it is possible speeding up a query many times by avoiding a sequential scans,

Reporting: Creating correct output

by Hans-Jürgen Schönig | 08.2013
Creating reports is a core task of every PostgreSQL database engineer or developer. Learn to create reports properly.

Table bloat revisited: Making tables shrink in PostgreSQL

by Hans-Jürgen Schönig | 08.2013
UPDATED Understand table bloat. Why deleting data from a table in a PostgreSQL database does not always shrink files on disk.

Common mistakes: UNION vs. UNION ALL

by Hans-Jürgen Schönig | 08.2013
In my role as a PostgreSQL consultant and trainer there are a couple of issues, which pop up on a […]

Reducing the number of columns with bit

by Hans-Jürgen Schönig | 08.2013
How to reduce the number of columns using bitfields in PostgreSQL. "bit” can be used just as a normal char data type.

Time in PostgreSQL: Outer joins

by Hans-Jürgen Schönig | 08.2013
UPDATED Aug 2023: How to use “generate_series” in an outer join: Use PostgreSQL to aggregate data on an hourly basis.

Time in PostgreSQL: The simple way

by Hans-Jürgen Schönig | 08.2013
UPDATED Aug. 2023: How to process time in PostgreSQL: timeseries & generate_series, day constants, add and subtract from a time interval.

CREATE TABLE – the fancy way with LIKE

by Hans-Jürgen Schönig | 05.2013
The LIKE keyword: Using LIKE is especially useful if you want to clone tables which have dozens of indexes and constraints.

Kostal Pico to PostgreSQL

by Hans-Jürgen Schönig | 05.2013
As there is hardly code available on the net showing how to access Kostal Pico, I decided to publish this one.

GIN - Just A Kind Of Index

by Hans-Jürgen Schönig | 03.2013
GIN stands for Generalized Inverted Index. Find out how data is organized within a PostgreSQL GIN index vs a B-Tree index e.g.
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