Postgresql on Christopher Tyler

Find Error in pg_dump

Wed, 05 Nov 2025 23:52:55 -0500

Find this handy tip on Mastodon.

List table columns in PostgreSQL database

Sat, 18 Oct 2025 16:13:43 -0500

An easy way to get all the tables in a given database.

Last Updated Columns with Postgres

Sat, 18 Oct 2025 15:31:38 -0500

Good article from Gunnar how to avoid using triggers.

Upgrade PostgreSQL from 17 to 18 on Windows

Fri, 10 Oct 2025 17:37:30 -0500

A couple of curveballs but a little easier than last year.

Data Alignment to Save Space

Thu, 18 Sep 2025 16:46:50 -0500

While it was an excellent talk, this was my biggest takeaway.

Remove Characters from a String

Tue, 26 Aug 2025 14:41:40 -0500

Needed to remove an email from a string of emails.

Get Schema Sizes

Tue, 29 Jul 2025 20:21:47 -0500

Get the size of each schema in a database.

How to Append Text in PostgreSQL

Fri, 18 Jul 2025 13:40:09 -0500

How to append text to a text column.

A PostgreSQL planner gotcha with CTEs DELETE and LIMIT

Sat, 03 May 2025 16:30:33 -0500

Good article from Shayon about CTEs and planner interactions.

Validating Data Types from Semi-Structured Data Loads in Postgres with pg_input_is_valid

Sat, 03 May 2025 16:08:59 -0500

Yet another excellent article from Elizabeth.

How to use Fuzzy String Matching with PostgreSQL

Sun, 06 Apr 2025 11:42:16 -0500

Good article from Peter.

How to List Active Connections on PostgreSQL

Sun, 06 Apr 2025 11:36:10 -0500

How to return the active connections.

Working with Time in Postgres

Sun, 06 Apr 2025 11:33:38 -0500

Yet another good article from Elizabeth.

Escape Keys using psycopg2

Sun, 06 Apr 2025 11:29:10 -0500

A mistake I seem to make repeatedly.

psql is Awesome

Sun, 06 Apr 2025 11:25:07 -0500

Excellent talk from Laetitia.

How to use Variables in a psql Script

Sun, 06 Apr 2025 11:19:37 -0500

How to use variables.

Improving GROUP BY with CREATE STATISTICS

Sun, 06 Apr 2025 11:03:29 -0500

Improve planning by using Create Statistics from Hans.

Include Schema in psycopg2 Connection String

Sun, 06 Apr 2025 10:45:49 -0500

A method to connect to a specific schema.

Create Read Only User in PostgreSQL

Sun, 06 Apr 2025 10:34:11 -0500

Creating a read only user.

MERGE Command with Examples

Sun, 06 Apr 2025 10:20:07 -0500

How to use the merge command with PostgreSQL 15 and above.

Creating Histograms with Postgres

Fri, 04 Apr 2025 19:29:24 -0500

A nice article on how to do histograms in PostgreSQL.

Data Spines

Tue, 01 Apr 2025 19:04:02 -0500

A way to fill in data.

List Table Columns in PostgreSQL Database

Mon, 31 Mar 2025 20:50:24 -0500

A way to list table columns.

How to Generate a list of Tables to Drop

Sat, 29 Mar 2025 21:08:33 -0500

An easy method to get a list of tables to remove.

Using Regex in PostgreSQL

Sat, 29 Mar 2025 21:01:37 -0500

How to do regex with SQL.

Linear Regression

Sat, 29 Mar 2025 20:57:27 -0500

How to do linear regression with SQL.

Date Functions

Sat, 29 Mar 2025 20:46:37 -0500

Different ways to extract values of a date.

Sampling

Sat, 29 Mar 2025 20:26:00 -0500

Sampling data with SQL.

Random

Sat, 29 Mar 2025 20:14:38 -0500

Some different ways to create random data

Create Table with Existing Table with No Data

Fri, 28 Mar 2025 21:12:09 -0500

Another Haki tip.

Postgres query cancellation

Tue, 18 Mar 2025 11:15:37 -0500

Couple of different ways to add a timeout to a PostgreSQL query.

VS Code to Copy and Paste to Terminal

Mon, 10 Mar 2025 11:18:37 -0500

Very useful tip from Mehdi without leaving your IDE

Generate CREATE TABLE query for an existing table

Sat, 22 Feb 2025 20:25:47 -0600

When you do not have the script that created the table.

Upgrade from PostgreSQL 15 to 17 on Windows using pg_upgrade

Sun, 10 Nov 2024 14:26:17 -0600

Overview

At work I needed to upgrade from PostgreSQL from 15 to 17. The process is not that different than upgrading in Ubuntu but there were a couple of items that threw me off.

Perform Backup

This should be done prior to the update in case something goes wrong:

CTyler@CTYLER_NB  C:\Program Files\PostgreSQL\17\bin  [08:22] 
❯ & 'C:\Program Files\PostgreSQL\17\bin\pg_dumpall.exe' -p 5432 -U postgres -f D:\Backups\postgresql-ctyler_nb-20241107-1.out

This was based on the documentation PostgreSQL: Documentation: 17: pg_dumpall.

Note keep in mind that you should create a pgpass.conf (or .pgpass for Linux):

Check for unused Indexes

Mon, 18 Dec 2023 14:00:00 -0500

Part of a larger PostgreSQL management article.

Using psql Variables to Introspect Your Script

Sun, 19 Nov 2023 00:03:39 -0500

Another good article from Lucas.

psql Watch Improvements

Fri, 10 Nov 2023 00:00:45 -0500

A good tip found by Luca.

How to List Active Connections on PostgreSQL

Tue, 17 Oct 2023 11:00:00 -0500

How to check using a query what is actively running.

Check for Unvalidated Database Constraints

Tue, 10 Oct 2023 11:00:00 -0500

Verify that you don’t have a constraint created without validation.

Date, Time and Time Zones

Wed, 04 Oct 2023 14:00:00 -0500

The pain of dealing with dates and time.

Set Statement Timeout

Tue, 01 Aug 2023 22:55:00 -0500

Set a timeout in case you want to terminate a long running query.

Escape Keys using psycopg2

Fri, 02 Jun 2023 20:00:00 -0500

Making sure that using % in PostgreSQL works with psycopg2.

Application Name in PostgreSQL

Fri, 31 Mar 2023 00:00:00 -0500

Send application name to PostgreSQL.

Get Disk Size for Each Database

Fri, 10 Mar 2023 00:00:00 -0500

Get the disk size for each database in PostgreSQL.

Include Schema in psycopg2 Connection String

Mon, 19 Dec 2022 17:00:00 -0500

Include schema in PostgreSQL connection string.

Create Automatic Timestamps in PostgreSQL

Fri, 16 Dec 2022 18:00:00 -0500

Create automatic timestamps by default.